* 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.
Measures the relationship between light intensity and solar panel power output. Panel is 80 x 55 mm rated at 6 V 100 mA. An INA219 measures current, voltage, and power output. A TP4056 controls the charge of a 600 mAh cell. Reports every 5 minutes.