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'''Photonicat 2''' uses a single buzzer to signal system events. This page lists every tone, its pitch and duration, and what triggers it.

For the indicator LED see [[Photonicat 2 LED Indicator]]. 中文版见 [[光影猫2 提示音说明]]。

The buzzer can be disabled through the host protocol. Sound and the indicator LED are controlled separately, so either can be silenced without affecting the other.

==Quick reference==

{| class="wikitable"
! Sound !! What you hear !! Meaning
|-
| 🔔 Two short rising beeps || beep-beep || Power on
|-
| 🔕 Three falling beeps || beep-boop-bop || Power off
|-
| 🔌 Two rising beeps, low start || beep-beep || Charger connected
|-
| ⚡ Bright three-note run || beep-beep-beep rising || Powering an external device
|-
| 🔊 Single short beep || beep || Charge current reached target
|-
| 🚨 Four high/low pairs || beep-boop ×4 || Over temperature, system shut down
|-
| 🛠 Two high/low rounds || boop-beep ×2 || Entering firmware download mode
|-
| ♻ Eight alternating tones || long high/low run || Entering factory reset mode
|-
| 🎵 Rising arpeggio, 3 s || low to high run || Data wipe succeeded, restarting
|-
| 🎵 Falling low tones, 2 s || high to low, sombre || Data wipe failed, restarting
|-
| 🎵 Bright rising motif, 2 s || short rising figure || Firmware update succeeded, restarting
|}

==Full tone table==

Frequencies in Hz, durations in ms. "silent" means the step waits without sounding.

{| class="wikitable"
! Sound !! Sequence (Hz / ms) !! Total !! Trigger
|-
| Power on || 1300/75 → 1500/75 || 0.15 s || Long press power button to start
|-
| Power off || 2000/150 → 1500/150 → 1000/150 || 0.45 s || Long press to shut down, or automatic low-battery shutdown
|-
| Charger connected || 432/150 → 528/75 || 0.23 s || Charger detected
|-
| Powering a device || 523/55 → 659/55 → 784/80 || 0.19 s || DC present and battery discharging, i.e. supplying an external device (must persist 4 s before it sounds)
|-
| Charge current reached || 2500/100 || 0.10 s || Charge current met the configured threshold
|-
| Over temperature || (2500/100 → 500/100) ×4 || 0.80 s || Temperature above limit, system powered down
|-
| Download mode || (3000/300 → 2000/300) ×2 || 1.20 s || From off: 3 short presses, then hold 10 s or more
|-
| Factory reset || 4000/300 → 1000/300 → 2000/300 → 3000/300 → 2000/300 → 4000/300 → 3000/300 → 1000/300 || 2.40 s || From off: 1 short press, then hold 17 s or more
|-
| MCU power-up (new bootloader) || 4000/30 → silent 1000 → 4000/200 || 1.23 s || MCU power-on self test
|-
| MCU power-up (old bootloader) || 4000/200 || 0.20 s || MCU power-on self test
|}

==Pre-restart tones==

These three play '''synchronously''': the device only resets once the tone has finished, so the duration is exactly how long you wait before the restart.

{| class="wikitable"
! Sound !! Sequence (Hz / ms) !! Total !! Trigger
|-
| 🎵 Wipe succeeded || 523/160 → 659/160 → 784/160 → 1047/160 → 1319/160 → 1568/160 → 2093/258 → silent 74 → 1568/135 → 2093/135 → 2637/429 → silent 92 → 2093/184 → 2637/184 → 3136/552 || 3.00 s || Factory data wipe succeeded, restarting
|-
| 🎵 Wipe failed || 440/357 → silent 51 → 415/357 → silent 51 → 392/357 → silent 51 → 330/765 || 1.99 s || Factory data wipe failed, restarting
|-
| 🎵 Update succeeded || 784/170 → 1047/170 → 1319/170 → 1568/382 → silent 102 → 1319/170 → 1568/170 → 2093/638 || 1.97 s || MCU firmware update succeeded, restarting
|}

'''Note:''' from firmware RA2E1260726002 these three play faster (wipe-succeeded cut from 4.89 s to 3.00 s, the other two by about 15 %). The note sequences are unchanged — only the tempo — so the wait before restart is shorter.

==Notes==

* Sound and the indicator LED have independent enable settings; silencing one leaves the other working.
* The "powering a device" tone requires the discharge condition to hold for 4 continuous seconds, so plugging and unplugging a charger will not trigger it spuriously.
* The watchdog is serviced normally while the pre-restart tones play, so a longer tone cannot cause an unexpected reset.

[[Category:Photonicat 2]]