Pump Controller Based on Arduino and esp-link. The controller can monitor discharge head and motor current so to protect the pump from dry running. The controller send mqtt data via esp-link (act as serial wifi bridge) to an mqtt broker running. For mo
10 Wp solar panel, two 3400 mAh Li-CoO2 18650 batteries in parallel, permanent small ~50 mW load. A shunt regulator limits battery voltage to 4.1 V. An externally powered ESP32 measures sol and bat powers for ThingSpeak.