Sparkfun Pro RF sleep mode wake up signal

Development Boards Artemis
1

I am using Artemis Nano to do continuous signal processing. I have connected Sparkfun Pro RF Lora module via Qwiic I2C to Artemis Nano to send events when Nano board detects something interesting. This combination is powered by using a battery pack. Typically it may take hours or days that nothing interesting happens and I want to set the Lora Module to deep sleep mode.

Questions:

  1. What would be the best way to wake-up the Lora module from sleep mode? I have understood it is not possible to wake up directly to I2C signal because connection is dead in sleep mode. But instead I have to use some connection pin to wake up the board. Which pins I should use? Are there other options, what would you recommend?

  2. What is the recommended Arduino library which I could use to setup the sleep mode or do you have some example code?

2

I decided to try simple interrupts first without the sleep mode. So I connected a wire to SAMD21 RF PRO D3 pin and defined interrupt handle like this:

const byte interruptPin = 3;

pinMode(interruptPin, INPUT_PULLUP);

attachInterrupt(digitalPinToInterrupt(interruptPin), interrupt, RISING); // tried CHANGE, FALLING too

I am writing HIGH/LOW to the wire with 1 second delay. And I am getting interrupts, but not all of them. Sometimes it takes 5-15 seconds before interrupt handler activates. What I am doing wrong?

3

I got it working, it was unstable because I forgot to connect the common ground wire.