I designed my own pcb for the ESP32 + RFM95 for the Lorawan network. My design is based on using the Lolin D32 combined with a RFM95.
I managed to get a deep sleep current for around 240uA while deep sleeping. I’m pretty happy with the first results. It should still be possible to achieve lower results, because Lolin D32 alone uses around 70uA while in deep sleep.
So the remaining 170uA is being used by the RFM95 while the ESP32 is in deep sleep. I hope I can bring it further down. I already tried to putting the SS pin (GPIO4) to HIGH before going to deep sleep and holding it HIGH with the use of the RTC part of the ESP32:
LMIC.shutdown();
digitalWrite(4, HIGH);
esp_err_t rtc_gpio_hold_en(GPIO_NUM_4);
The library I am using to control the RFM95 is this one which support deep sleep:
Anybody got any suggestions what I could try more?