Back in Arduino-land, here’s a test of waking up from deep-sleep, reading the BME280 and then sending it to adafruit.io before going back to sleep. We read the sensor data before starting up the wifi, so the sensor isn’t heated up from the ESP32S2 too much. Quiescent current is 85uA, we think most of that is the AP2112 regulator. We removed the LC907203 battery monitor for now, it seems to have spikey ADC reads that kick in every second or so (which is fine but is a little confusing) – video. // Read more: original article.