Photonicat 2 LED Indicator - 版本历史

C2h2：RA2E1260808001: low-battery red warning exempt from LED-disable (system-level alert)

2026-08-08T12:44:12Z

RA2E1260808001: low-battery red warning exempt from LED-disable (system-level alert)

←上一版本		2026年8月8日 (六) 20:44的版本
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	* Green breathing peaks at 25 % duty while steady green is 50 %, so breathing green looks dimmer than steady green. Orange breathing peaks at the same R60 %/G24 % mix as steady orange.		* Green breathing peaks at 25 % duty while steady green is 50 %, so breathing green looks dimmer than steady green. Orange breathing peaks at the same R60 %/G24 % mix as steady orange.
	* 🔴 Red is only ever used for low battery. While the system is running it keeps flashing until the voltage recovers or a charger is connected; while off it flashes exactly three times.		* 🔴 Red is only ever used for low battery. While the system is running it keeps flashing until the voltage recovers or a charger is connected; while off it flashes exactly three times.
	* The indicator can be disabled ~~entirely~~ through the host protocol, in which case ~~it stays off in~~ all states.		* The indicator can be disabled through the host protocol, in which case all green/yellow states stay off. The 🔴 low-battery red warning is exempt since '''RA2E1260808001''': it is a system-level alert and flashes even with the indicator disabled, so a flat pack refusing to boot never looks dead. (Before that version, disabling the indicator silenced red too.)
	* For how the charge level behind these indications is computed, see [[Photonicat 2 SOC Calculation]].		* For how the charge level behind these indications is computed, see [[Photonicat 2 SOC Calculation]].

	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]

C2h2：RA2E1260808001: continuous low-batt red now stops at shutdown (was flashing forever, blocked standby)

2026-08-08T12:39:54Z

RA2E1260808001: continuous low-batt red now stops at shutdown (was flashing forever, blocked standby)

←上一版本		2026年8月8日 (六) 20:39的版本
第13行：		第13行：
	Fixed in '''RA2E1260805000''': on RA2E1260802000–RA2E1260802001 a short press while the device was off in standby could flash red three times '''even with a full battery''' — the voltage sensor briefly reads 0 mV while waking from standby and this was miscounted as low battery. Red now requires a genuine low-voltage reading.		Fixed in '''RA2E1260805000''': on RA2E1260802000–RA2E1260802001 a short press while the device was off in standby could flash red three times '''even with a full battery''' — the voltage sensor briefly reads 0 mV while waking from standby and this was miscounted as low battery. Red now requires a genuine low-voltage reading.

	Since '''RA2E1260808001''': with the system off and the battery below the minimum boot voltage (6600 mV), '''any''' press of the power button answers with the three red flashes right away — about 0.1 s into the press, before the system power rail is touched — and the device then drops back into deep sleep to preserve the last battery reserve for the built-in clock. On RA2E1260802000–RA2E1260808000 the refused-boot flashes only appeared after holding the full 1.5 s long press and releasing; a shorter press showed nothing until release.		Since '''RA2E1260808001''': with the system off and the battery below the minimum boot voltage (6600 mV), '''any''' press of the power button answers with the three red flashes right away — about 0.1 s into the press, before the system power rail is touched — and the device then drops back into deep sleep to preserve the last battery reserve for the built-in clock. On RA2E1260802000–RA2E1260808000 the refused-boot flashes only appeared after holding the full 1.5 s long press and releasing; a shorter press showed nothing until release. Also fixed in this version: if the continuous low-battery warning was flashing when the system shut down (including the automatic 6300 mV shutdown), earlier firmware never cancelled it — the red kept flashing indefinitely after the system was off and prevented the controller from sleeping, draining the remaining battery. It now stops at shutdown.

	中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].		中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].

C2h2：RA2E1260808001: flat-pack refusal red x3 now at press time (~0.1s), before RK rail; deep sleep after

2026-08-08T12:34:55Z

RA2E1260808001: flat-pack refusal red x3 now at press time (~0.1s), before RK rail; deep sleep after

C2h2：RA2E1260805000: fix false red x3 on short press at full battery after standby wake (issue #53); document RA2E1260802000 red x3 behaviour

2026-08-05T09:40:54Z

RA2E1260805000: fix false red x3 on short press at full battery after standby wake (issue #53); document RA2E1260802000 red x3 behaviour

C2h2：RA2E1260731011: warmer orange R60/G24, breath valley floor (no pure-red tails), 0.5s off hold / 6.1s cycle; v3 GIFs

2026-07-31T11:26:36Z

RA2E1260731011: warmer orange R60/G24, breath valley floor (no pure-red tails), 0.5s off hold / 6.1s cycle; v3 GIFs

C2h2：Point cross-links at the renamed SOC pages directly instead of via redirects

2026-07-26T09:25:25Z

Point cross-links at the renamed SOC pages directly instead of via redirects

←上一版本		2026年7月26日 (日) 17:25的版本
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	* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.		* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.
	* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.		* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.
	* For how the charge level behind these indications is computed, see [[~~How~~ Photonicat 2 ~~Calculates~~ SOC]].		* For how the charge level behind these indications is computed, see [[Photonicat 2 SOC Calculation]].

	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]

C2h2：Move the SOC cross-link above the category tag

2026-07-26T09:22:56Z

Move the SOC cross-link above the category tag

←上一版本		2026年7月26日 (日) 17:22的版本
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	* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.		* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.
	* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.		* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.
			* For how the charge level behind these indications is computed, see [[How Photonicat 2 Calculates SOC]].

	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]
	* For how the charge level behind these indications is computed, see [[How Photonicat 2 Calculates SOC]].

C2h2：Link to the coulomb-counter/SOC explainer

2026-07-26T09:22:31Z

Link to the coulomb-counter/SOC explainer

←上一版本		2026年7月26日 (日) 17:22的版本
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	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]
			* For how the charge level behind these indications is computed, see [[How Photonicat 2 Calculates SOC]].

C2h2：Low-battery red now flashes continuously (firmware RA2E1260726003+) instead of stopping after 3 flashes

2026-07-26T03:50:15Z

Low-battery red now flashes continuously (firmware RA2E1260726003+) instead of stopping after 3 flashes

←上一版本		2026年7月26日 (日) 11:50的版本
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	\| [[File:Pcat2-led-green-heartbeat-v2.gif\|52px\|link=]] \|\| 🟢 Green, heartbeat pulse \|\| Running on battery, charge level normal		\| [[File:Pcat2-led-green-heartbeat-v2.gif\|52px\|link=]] \|\| 🟢 Green, heartbeat pulse \|\| Running on battery, charge level normal
	\|-		\|-
	\| [[File:Pcat2-led-red-lowbatt-v2.gif\|52px\|link=]] \|\| 🔴 Red, ~~3 flashes~~ \|\| Low battery (below 6500 mV~~, 3 flashes only~~ — see [[#Low battery red light\|Low battery red light]])		\| [[File:Pcat2-led-red-lowbatt-v2.gif\|52px\|link=]] \|\| 🔴 Red, flashing \|\| Low battery (below 6500 mV — see [[#Low battery red light\|Low battery red light]])
	\|-		\|-
	\| [[File:Pcat2-led-off-v2.gif\|52px\|link=]] \|\| ⚫ Off \|\| Idle on battery, system off		\| [[File:Pcat2-led-off-v2.gif\|52px\|link=]] \|\| ⚫ Off \|\| Idle on battery, system off
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	\| Above 6600 mV, system off \|\| None \|\| [[File:Pcat2-led-green-solid-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Steady \|\| Constant		\| Above 6600 mV, system off \|\| None \|\| [[File:Pcat2-led-green-solid-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Steady \|\| Constant
	\|-		\|-
	\| Below 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| ~~Flicker~~ \|\| 1 s on / 1 s off~~, 3 flashes~~, begins after 60 s		\| Below 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Continuous flashing \|\| 1 s on / 1 s off, begins after 60 s, until the voltage recovers
	\|-		\|-
	\| Below 6500 mV, short press \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, ~~3 flashes~~		\| Below 6500 mV, short press \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, while held or until the voltage recovers
	\|-		\|-
	\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off		\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off
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	\| Rhythm \|\| 1 second on / 1 second off		\| Rhythm \|\| 1 second on / 1 second off
	\|-		\|-
	\| Repeats \|\| '''~~Stops after 3 flashes~~''' ~~— it does not keep flashing~~		\| Repeats \|\| '''Flashes continuously''' until the voltage recovers or a charger is connected
	\|-		\|-
	\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''		\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''
	\|-		\|-
	\| Short press \|\| With a low battery, a short press of the power button ~~shows it~~ immediately (~~3 flashes~~ after a 0.5 s debounce)		\| Short press \|\| With a low battery, a short press of the power button triggers the red flashing immediately (after a 0.5 s debounce)
	\|-		\|-
	\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together		\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together
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	'''⚠️ Important'''		'''⚠️ Important'''

	* The red warning '''~~stops after 3 flashes~~'''. ~~If you miss it, there is no further light warning~~ before ~~the device shuts down.~~		* The red warning '''keeps flashing until the voltage recovers or a charger is connected'''; it does not stop on its own. (Firmware before RA2E1260726003 flashed only 3 times and then went quiet.)
	* To check the level again, '''press the power button once''' to re-trigger the warning.
	* The red threshold (6500 mV) is only '''200 mV above the hard shutdown point (6300 mV)'''. That is a very steep part of the 2S li-ion discharge curve, so connect a charger promptly once you see red.		* The red threshold (6500 mV) is only '''200 mV above the hard shutdown point (6300 mV)'''. That is a very steep part of the 2S li-ion discharge curve, so connect a charger promptly once you see red.
	* The trigger is '''voltage, not a percentage'''. Under heavy load the voltage sags and the warning can appear while a useful charge remains; when the load drops the voltage recovers and the warning stops.		* The trigger is '''voltage, not a percentage'''. Under heavy load the voltage sags and the warning can appear while a useful charge remains; when the load drops the voltage recovers and the warning stops.
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	* Breathing runs at a lower peak brightness (25 % duty) than steady (50 %), so a breathing indicator looks dimmer than a steady one of the same colour.		* Breathing runs at a lower peak brightness (25 % duty) than steady (50 %), so a breathing indicator looks dimmer than a steady one of the same colour.
	* 🔴 Red is only ever used for low battery, and ~~stops after three flashes rather than~~ flashing ~~continuously~~.		* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.
	* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.		* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.

	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]

C2h2：Add 'Low battery red light' section: 6500 mV trigger, 60 s delay, stops after 3 flashes, and only 200 mV above the 6300 mV shutdown point

2026-07-26T03:46:11Z

Add 'Low battery red light' section: 6500 mV trigger, 60 s delay, stops after 3 flashes, and only 200 mV above the 6300 mV shutdown point

@@ 第27行： / 第27行： @@
 | [[File:Pcat2-led-green-heartbeat-v2.gif|52px|link=]] || 🟢 Green, heartbeat pulse || Running on battery, charge level normal
 |-
-| [[File:Pcat2-led-red-lowbatt-v2.gif|52px|link=]] || 🔴 Red, 3 flashes || Low battery
+| [[File:Pcat2-led-red-lowbatt-v2.gif|52px|link=]] || 🔴 Red, 3 flashes || Low battery (below 6500 mV, 3 flashes only — see [[#Low battery red light|Low battery red light]])
 |-
 | [[File:Pcat2-led-off-v2.gif|52px|link=]] || ⚫ Off || Idle on battery, system off
@@ 第75行： / 第75行： @@
 | Reset / factory restore mode || [[File:Pcat2-led-orange-blink-slow-v2.gif|44px|link=]] || 🟠 Yellow || Slow blink || ≈1 s period
 |}
 ==Charge limit==

←上一版本		2026年8月8日 (六) 20:34的版本
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	Fixed in '''RA2E1260805000''': on RA2E1260802000–RA2E1260802001 a short press while the device was off in standby could flash red three times '''even with a full battery''' — the voltage sensor briefly reads 0 mV while waking from standby and this was miscounted as low battery. Red now requires a genuine low-voltage reading.		Fixed in '''RA2E1260805000''': on RA2E1260802000–RA2E1260802001 a short press while the device was off in standby could flash red three times '''even with a full battery''' — the voltage sensor briefly reads 0 mV while waking from standby and this was miscounted as low battery. Red now requires a genuine low-voltage reading.

			Since '''RA2E1260808001''': with the system off and the battery below the minimum boot voltage (6600 mV), '''any''' press of the power button answers with the three red flashes right away — about 0.1 s into the press, before the system power rail is touched — and the device then drops back into deep sleep to preserve the last battery reserve for the built-in clock. On RA2E1260802000–RA2E1260808000 the refused-boot flashes only appeared after holding the full 1.5 s long press and releasing; a shorter press showed nothing until release.

	中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].		中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].
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	\| Below 6500 mV (valid reading), short press, system off \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, '''3 flashes''', first flash immediate (0.5 s debounce)		\| Below 6500 mV (valid reading), short press, system off \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, '''3 flashes''', first flash immediate (0.5 s debounce)
	\|-		\|-
	\| Below 6600 mV, ~~long~~-press ~~power-up refused~~ \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| '''3 flashes''', first flash ~~immediate~~		\| Below 6600 mV, any power-button press, system off \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| '''3 flashes''', first flash ≈0.1 s into the press (since '''RA2E1260808001'''; earlier firmware flashed only after releasing a full 1.5 s long press). The system power rail is never touched; the device returns to deep sleep afterwards
	\|-		\|-
	\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off		\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off
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	\| Rhythm \|\| 1 second on / 1 second off		\| Rhythm \|\| 1 second on / 1 second off
	\|-		\|-
	\| Repeats \|\| '''System running:''' flashes continuously until the voltage recovers or a charger is connected. '''System off''' (~~short press or refused~~ power-up): exactly '''3 flashes''', then the device goes back to ~~standby~~		\| Repeats \|\| '''System running:''' flashes continuously until the voltage recovers or a charger is connected. '''System off''' (any power-button press): exactly '''3 flashes''', then the device goes back to deep sleep
	\|-		\|-
	\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''		\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''
	\|-		\|-
	\| ~~Short~~ press \|\| With ~~a low~~ battery, ~~a short~~ press of the power button flashes red three times ~~immediately (after a~~ 0.5 s ~~debounce~~). A 0 mV sensor warm-up reading right after standby wake does not count (since '''RA2E1260805000''')		\| Any press while off \|\| With the battery below the boot threshold, any press of the power button flashes red three times, starting about 0.1 s into the press (since '''RA2E1260808001'''); the device then returns to deep sleep. A 0 mV sensor warm-up reading right after standby wake does not count — the firmware takes a fresh voltage sample before deciding (since '''RA2E1260805000''')
	\|-		\|-
	\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together		\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together

←上一版本		2026年8月5日 (三) 17:40的版本
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	Since '''RA2E1260731011''' the charging orange is warmer (R60 %/G24 % instead of R55 %/G35 %), the breath fades only to a dim-orange floor (≈1/12 of peak) before the valley off — on earlier firmware the dim ends of each breath cycle could look pure red — and the valley off hold is 0.5 s instead of 0.24 s (cycle ≈6.1 s).		Since '''RA2E1260731011''' the charging orange is warmer (R60 %/G24 % instead of R55 %/G35 %), the breath fades only to a dim-orange floor (≈1/12 of peak) before the valley off — on earlier firmware the dim ends of each breath cycle could look pure red — and the valley off hold is 0.5 s instead of 0.24 s (cycle ≈6.1 s).

			Since '''RA2E1260802000''': trying to power on with a flat or too-low pack flashes red '''three times''' immediately (earlier firmware showed nothing, so a flat device looked bricked), and a short press while off with a low pack shows the same three flashes. Continuous red flashing is only used while the system is running. The power-button long press is now 1.5 s.

			Fixed in '''RA2E1260805000''': on RA2E1260802000–RA2E1260802001 a short press while the device was off in standby could flash red three times '''even with a full battery''' — the voltage sensor briefly reads 0 mV while waking from standby and this was miscounted as low battery. Red now requires a genuine low-voltage reading.

	中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].		中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].
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	\| Below 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Continuous flashing \|\| 1 s on / 1 s off, begins after 60 s, until the voltage recovers		\| Below 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Continuous flashing \|\| 1 s on / 1 s off, begins after 60 s, until the voltage recovers
	\|-		\|-
	\| Below 6500 mV, short press \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, ~~while held or until the voltage recovers~~		\| Below 6500 mV (valid reading), short press, system off \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| 1 s on / 1 s off, '''3 flashes''', first flash immediate (0.5 s debounce)
			\|-
			\| Below 6600 mV, long-press power-up refused \|\| None \|\| [[File:Pcat2-led-red-lowbatt-v2.gif\|44px\|link=]] \|\| 🔴 Red \|\| Flicker \|\| '''3 flashes''', first flash immediate
	\|-		\|-
	\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off		\| Charger removed, system off \|\| None \|\| [[File:Pcat2-led-off-v2.gif\|44px\|link=]] \|\| colspan="2" \| ⚫ Off
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	\| Rhythm \|\| 1 second on / 1 second off		\| Rhythm \|\| 1 second on / 1 second off
	\|-		\|-
	\| Repeats \|\| '''~~Flashes continuously~~''' until the voltage recovers or a charger is connected		\| Repeats \|\| '''System running:''' flashes continuously until the voltage recovers or a charger is connected. '''System off''' (short press or refused power-up): exactly '''3 flashes''', then the device goes back to standby
	\|-		\|-
	\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''		\| While running \|\| Starts only after the voltage has stayed below the threshold for '''60 seconds'''
	\|-		\|-
	\| Short press \|\| With a low battery, a short press of the power button ~~triggers the~~ red ~~flashing~~ immediately (after a 0.5 s debounce)		\| Short press \|\| With a low battery, a short press of the power button flashes red three times immediately (after a 0.5 s debounce). A 0 mV sensor warm-up reading right after standby wake does not count (since '''RA2E1260805000''')
	\|-		\|-
	\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together		\| Effect on green \|\| The green heartbeat stops while red is active; the two never show together
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	'''⚠️ Important'''		'''⚠️ Important'''

	* ~~The~~ red warning '''keeps flashing until the voltage recovers or a charger is connected'''; it does not stop on its own. (Firmware before RA2E1260726003 flashed only 3 times and then went quiet.)		* While the system is running, the red warning '''keeps flashing until the voltage recovers or a charger is connected'''; it does not stop on its own. (Firmware before RA2E1260726003 flashed only 3 times and then went quiet.) While the system is off, short press and refused power-up flash exactly 3 times so the MCU can return to standby.
	* The red threshold (6500 mV) is only '''200 mV above the hard shutdown point (6300 mV)'''. That is a very steep part of the 2S li-ion discharge curve, so connect a charger promptly once you see red.		* The red threshold (6500 mV) is only '''200 mV above the hard shutdown point (6300 mV)'''. That is a very steep part of the 2S li-ion discharge curve, so connect a charger promptly once you see red.
	* The trigger is '''voltage, not a percentage'''. Under heavy load the voltage sags and the warning can appear while a useful charge remains; when the load drops the voltage recovers and the warning stops.		* The trigger is '''voltage, not a percentage'''. Under heavy load the voltage sags and the warning can appear while a useful charge remains; when the load drops the voltage recovers and the warning stops.
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	* Green breathing peaks at 25 % duty while steady green is 50 %, so breathing green looks dimmer than steady green. Orange breathing peaks at the same R60 %/G24 % mix as steady orange.		* Green breathing peaks at 25 % duty while steady green is 50 %, so breathing green looks dimmer than steady green. Orange breathing peaks at the same R60 %/G24 % mix as steady orange.
	* 🔴 Red is only ever used for low battery~~, and~~ keeps flashing until the voltage recovers or a charger is connected.		* 🔴 Red is only ever used for low battery. While the system is running it keeps flashing until the voltage recovers or a charger is connected; while off it flashes exactly three times.
	* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.		* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.
	* For how the charge level behind these indications is computed, see [[Photonicat 2 SOC Calculation]].		* For how the charge level behind these indications is computed, see [[Photonicat 2 SOC Calculation]].

	[[Category:Photonicat 2]]		[[Category:Photonicat 2]]

←上一版本		2026年7月31日 (五) 19:26的版本
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	Applies to firmware '''RA2E1260726001''' and later. Earlier firmware did not distinguish system on/off while charging or charged.		Applies to firmware '''RA2E1260726001''' and later. Earlier firmware did not distinguish system on/off while charging or charged.

			Since '''RA2E1260731011''' the charging orange is warmer (R60 %/G24 % instead of R55 %/G35 %), the breath fades only to a dim-orange floor (≈1/12 of peak) before the valley off — on earlier firmware the dim ends of each breath cycle could look pure red — and the valley off hold is 0.5 s instead of 0.24 s (cycle ≈6.1 s).

	中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].		中文版见 [[Photonicat 2 LED 指示灯]]. For buzzer tones see [[Photonicat 2 Sound Guide]].
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	==Quick reference==		==Quick reference==

	The animations below are illustrative; their timing matches the firmware (5.84 s breathing cycle, 2 s heartbeat).		The animations below are illustrative; their timing matches the firmware (≈6.1 s breathing cycle, 2 s heartbeat).


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	! Animation !! Indicator !! Meaning		! Animation !! Indicator !! Meaning
	\|-		\|-
	\| [[File:Pcat2-led-orange-breathing-v2.gif\|52px\|link=]] \|\| 🟠 Yellow, breathing \|\| Charging, system running		\| [[File:Pcat2-led-orange-breathing-v3.gif\|52px\|link=]] \|\| 🟠 Yellow, breathing \|\| Charging, system running
	\|-		\|-
	\| [[File:Pcat2-led-orange-solid-v2.gif\|52px\|link=]] \|\| 🟠 Yellow, steady \|\| Charging, system off		\| [[File:Pcat2-led-orange-solid-v3.gif\|52px\|link=]] \|\| 🟠 Yellow, steady \|\| Charging, system off
	\|-		\|-
	\| [[File:Pcat2-led-green-breathing-v2.gif\|52px\|link=]] \|\| 🟢 Green, breathing \|\| Fully charged (or at charge limit), system running		\| [[File:Pcat2-led-green-breathing-v3.gif\|52px\|link=]] \|\| 🟢 Green, breathing \|\| Fully charged (or at charge limit), system running
	\|-		\|-
	\| [[File:Pcat2-led-green-solid-v2.gif\|52px\|link=]] \|\| 🟢 Green, steady \|\| Fully charged (or at charge limit), system off		\| [[File:Pcat2-led-green-solid-v2.gif\|52px\|link=]] \|\| 🟢 Green, steady \|\| Fully charged (or at charge limit), system off
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	! Power level !! Charger !! Animation !! Colour !! Pattern !! Timing		! Power level !! Charger !! Animation !! Colour !! Pattern !! Timing
	\|-		\|-
	\| Charging, any level \|\| Connected \|\| [[File:Pcat2-led-orange-breathing-v2.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Breathing (system on) \|\| 2.8 s up / 2.8 s down / 0.24 s off, ≈5.84 s cycle		\| Charging, any level \|\| Connected \|\| [[File:Pcat2-led-orange-breathing-v3.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Breathing (system on) \|\| 2.8 s up / 2.8 s down / 0.5 s off, ≈6.1 s cycle; fades to a dim-orange floor (≈peak/12), never pure red
	\|-		\|-
	\| Charging, any level \|\| Connected \|\| [[File:Pcat2-led-orange-solid-v2.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Steady (system off) \|\| Constant		\| Charging, any level \|\| Connected \|\| [[File:Pcat2-led-orange-solid-v3.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Steady (system off) \|\| Constant
	\|-		\|-
	\| Full, or at charge limit \|\| Connected \|\| [[File:Pcat2-led-green-breathing-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Breathing (system on) \|\| Same 5.84 s cycle, after 10 s delay		\| Full, or at charge limit \|\| Connected \|\| [[File:Pcat2-led-green-breathing-v3.gif\|44px\|link=]] \|\| 🟢 Green \|\| Breathing (system on) \|\| Same ≈6.1 s cycle, after 10 s delay
	\|-		\|-
	\| Full, or at charge limit \|\| Connected \|\| [[File:Pcat2-led-green-solid-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Steady (system off) \|\| Constant, after 10 s delay		\| Full, or at charge limit \|\| Connected \|\| [[File:Pcat2-led-green-solid-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Steady (system off) \|\| Constant, after 10 s delay
	\|-		\|-
	\| Below 6600 mV, DC ≥ 8 V, no charge current \|\| Connected \|\| [[File:Pcat2-led-orange-solid-v2.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Steady \|\| Constant		\| Below 6600 mV, DC ≥ 8 V, no charge current \|\| Connected \|\| [[File:Pcat2-led-orange-solid-v3.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Steady \|\| Constant
	\|-		\|-
	\| Above 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-green-heartbeat-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Heartbeat pulse \|\| 2 s period		\| Above 6500 mV, system on \|\| None \|\| [[File:Pcat2-led-green-heartbeat-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Heartbeat pulse \|\| 2 s period
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	\| Shutting down \|\| [[File:Pcat2-led-green-blink-shutdown-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Blink \|\| ≈0.5 s on / 1.5 s off		\| Shutting down \|\| [[File:Pcat2-led-green-blink-shutdown-v2.gif\|44px\|link=]] \|\| 🟢 Green \|\| Blink \|\| ≈0.5 s on / 1.5 s off
	\|-		\|-
	\| Firmware download mode \|\| [[File:Pcat2-led-orange-blink-fast-v2.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Fast blink \|\| ≈0.5 s period		\| Firmware download mode \|\| [[File:Pcat2-led-orange-blink-fast-v3.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Fast blink \|\| ≈0.5 s period
	\|-		\|-
	\| Reset / factory restore mode \|\| [[File:Pcat2-led-orange-blink-slow-v2.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Slow blink \|\| ≈1 s period		\| Reset / factory restore mode \|\| [[File:Pcat2-led-orange-blink-slow-v3.gif\|44px\|link=]] \|\| 🟠 Yellow \|\| Slow blink \|\| ≈1 s period
	\|}		\|}

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	==Notes==		==Notes==

	* ~~Breathing runs~~ at ~~a lower peak brightness (~~25 % duty~~) than~~ steady (50 %), so a breathing ~~indicator~~ looks dimmer than a steady ~~one of~~ the same ~~colour~~.		* Green breathing peaks at 25 % duty while steady green is 50 %, so breathing green looks dimmer than steady green. Orange breathing peaks at the same R60 %/G24 % mix as steady orange.
	* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.		* 🔴 Red is only ever used for low battery, and keeps flashing until the voltage recovers or a charger is connected.
	* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.		* The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.

Photonicat 2 LED Indicator - 版本历史

C2h2：​RA2E1260808001: low-battery red warning exempt from LED-disable (system-level alert)

C2h2：​RA2E1260808001: continuous low-batt red now stops at shutdown (was flashing forever, blocked standby)

C2h2：​RA2E1260808001: flat-pack refusal red x3 now at press time (~0.1s), before RK rail; deep sleep after

C2h2：​RA2E1260805000: fix false red x3 on short press at full battery after standby wake (issue #53); document RA2E1260802000 red x3 behaviour

C2h2：​RA2E1260731011: warmer orange R60/G24, breath valley floor (no pure-red tails), 0.5s off hold / 6.1s cycle; v3 GIFs

C2h2：​Point cross-links at the renamed SOC pages directly instead of via redirects

C2h2：​Move the SOC cross-link above the category tag

C2h2：​Link to the coulomb-counter/SOC explainer

C2h2：​Low-battery red now flashes continuously (firmware RA2E1260726003+) instead of stopping after 3 flashes

C2h2：​Add 'Low battery red light' section: 6500 mV trigger, 60 s delay, stops after 3 flashes, and only 200 mV above the 6300 mV shutdown point