Photon, OS: 1.4.0
Adafruit RFM95x LoRa radio breakout (SPI bus)
59025-010-ND NO reed switch connected to WKP/GND, pulled to VDD via 10k ohm resistor
2N7000 N-MOSFET (to power the radio), gate pin pulled to GND via 10K ohm resistor
My goal is to power the system for >8 months with a 10,000mAh LiPo, WiFi OFF, 4 to 10 50 byte messages per day to a LoRa 915MHz gateway. Photon and LoRa radio ON power consumption is between 40mA and 300mA. Deep sleep the rest of the time.
Using the N-MOSFET to power off the radio - deep sleep is 201uA, not bad but I expected more. Removing power and GND to the radio (and reed switch), the power consumption dropped to 81uA, exactly what the data sheet indicates - perfect. Removing just the reed switch connections the load drops to 140uA indicating a 61uA load from the WKP pull-up and a 59uA load from the N-MOSFET pull-down. Other ideas to further reduce demand while still powering the radio and responding to the WKP from deep sleep?