Putting RAK4200 into sleep doesn’t get the module into the sleep current as advertised.
It is around 40 uA. Upon checking all the pins on RAK4200 during sleep, I notice the following pins are floating during sleep:
- 3 - UART2_DE
- 4 - UART1_TX
- 6 - UART1_DE
- 9 - I2C_SCL
- 10 - I2C_SDA
- 16 - SPI_MISO
But, the biggest culprit among them is pin 16 (SPI_MISO). If I were to put a multimeter to measure the voltage of this pin 16, the extra 40 uA will disappear. Firmware revision is v3.0.12.