RPUno has some current sources that can be used to light LED strings. Analog has two 22mA sources, Digital has one 22mA source and the ICP has a 17mA source. Use the pluggable Digital IO's 3,10,11,12 for LED control, i.e. to sink a current source. Most of the examples use digital 13 as an I2C status, and the Day-Night state machine is using digital 4 as a status.
The logic was mostly taken from Solenoid and allows setting a pre start delay, a runtime, a cycle delay and the mAHr of discharge at which the LED's stop cycling.
ATmega328P node with an LT3652 solar charge controller
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