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LED Signals
jbaumann edited this page Apr 13, 2020
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We only have one LED, but we can signal quite a lot with it. Here is a list of signals and their meaning:
| Signal | Meaning |
|---|---|
| LED blinks every second | Normal operation, battery voltage is above warn voltage |
| LED blinks every 2 seconds | Battery voltage is below warn voltage, RPI has been given the signal to shut down |
| LED blinks arhythmic | The Raspberry accesses the ATTiny via I2C, each read or write is one LED flash |
| LED does not blink during normal operation | primed is 0 or system is in shutdown |
| LED blinks once when turned on | primed is 0 or system is in shutdown |
| LED blinks 5 times in fast succession | RPi should take action, possibly shut down |
| LED blinks 10 times in very fast succession | RPi has not accessed the I2C interface for more than "timeout" seconds. System is restarted |
| LED sends SOS | wrong fuse settings |