Photonicat 2 LED Indicator

Photonicat 2 has a single two-colour indicator LED (red + green). Yellow/orange is produced by lighting both colours together; there is no blue.

The indicator follows a MacBook-style scheme:

• Colour tells you the charge state — 🟠 yellow = charging, 🟢 green = charged.
• Motion tells you the machine state — breathing = system running, steady = system off.

Applies to firmware RA2E1260726001 and later. Earlier firmware did not distinguish system on/off while charging or charged.

中文版见 光影猫2 LED 指示灯. For buzzer tones see Photonicat 2 Sound Guide.

Quick reference

Indicator	Meaning
🟠 Yellow, breathing	Charging, system running
🟠 Yellow, steady	Charging, system off
🟢 Green, breathing	Fully charged (or at charge limit), system running
🟢 Green, steady	Fully charged (or at charge limit), system off
🟢 Green, heartbeat pulse	Running on battery, charge level normal
🔴 Red, 3 flashes	Low battery
⚫ Off	Idle on battery, system off

Full state table

Battery thresholds are firmware defaults and can be overridden by the host. Values are for the 2S pack: full 8280 mV, low warning 6500 mV, minimum boot 6600 mV, hard shutdown 6300 mV.

Power level	Charger	Colour	Pattern	Timing
Charging, any level	Connected	🟠 Yellow	Breathing (system on)	2.8 s up / 2.8 s down / 0.24 s off, ≈5.84 s cycle
Charging, any level	Connected	🟠 Yellow	Steady (system off)	Constant
Full, or at charge limit	Connected	🟢 Green	Breathing (system on)	Same 5.84 s cycle, after 10 s delay
Full, or at charge limit	Connected	🟢 Green	Steady (system off)	Constant, after 10 s delay
Below 6600 mV, DC ≥ 8 V, no charge current	Connected	🟠 Yellow	Steady	Constant
Above 6500 mV, system on	None	🟢 Green	Heartbeat pulse	2 s period
Above 6500 mV, system starting	None	🟢 Green	Steady	Constant
Above 6600 mV, system off	None	🟢 Green	Steady	Constant
Below 6500 mV, system on	None	🔴 Red	Flicker	1 s on / 1 s off, 3 flashes, begins after 60 s
Below 6500 mV, short press	None	🔴 Red	Flicker	1 s on / 1 s off, 3 flashes
Charger removed, system off	None	⚫ Off

Service and transitional states

These override the states above.

State	Colour	Pattern	Timing
Shutting down	🟢 Green	Blink	≈0.5 s on / 1.5 s off
Firmware download mode	🟠 Yellow	Fast blink	≈0.5 s period
Reset / factory restore mode	🟠 Yellow	Slow blink	≈1 s period

Charge limit

If a charge limit is configured (for example 80 %), the charger is switched off once the pack reaches it. Charge current drops to zero, so the device treats this as fully charged and shows 🟢 green. The pack then powers the load and slowly discharges until it falls below the resume threshold, at which point charging restarts and the indicator returns to 🟠 yellow. Each transition is delayed by about 10 seconds.

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.
• 🔴 Red is only ever used for low battery, and stops after three flashes rather than flashing continuously.
• The indicator can be disabled entirely through the host protocol, in which case it stays off in all states.