I am searching for an ESP32 board which is really suitable for battery operation?
My application should measure the voltage of an solar powered 12V car battery. The voltage value should be sent once per hour via the TTN network. After measurement and transmitting the board should fall into deep sleeping. A SSD1306 display should display the measured value for the time when the ESP is wake up and afterwards it should get switched off.
I have tried several boards like TTGO V 2.1_V1.6, Wemos D1 mini and TTGO T-Beam T22_V07. But each one consumes current in mA range while in deep sleep. I am searching a board which uses uA’s while in deep sleep mode.
The only opportunity I found is the new TTGO T-Beam T22_V10. I don’t need GPS so it is a little bit oversized for the use case. But because I cannot find any alternative and assume that it should suitable for the requirement I ordered one.
While waiting for the delivery I want to find out if there are some alternatives?
Can anyone recommend an alternative ESP32/LoRaWAN board with moderate deep sleep current and display?