* Field 1-3: Solar panel 50x50mm (2V, 70mA), D1 Mini Pro in DeepSleep (4min) and ESP-Now. Sending to ESP32 (gateway) which logs to ThingSpeak.
* Field 4-8: Solar panel 100x60mm (6V, 1W), D1 Mini in DeepSleep (5min) and WiFi logging to ThingSpeak.
Simple weather station by using Ti HDC1080 temperature & RH sensor and ESP8266 module configured in deep sleep mode. The whole unit is powered by 1000mAH lipo battery and a small solor panel (below 1W).