ESP32 and soil sensor combo. Battery powered but rigging a solar panel might be possible. https://www.cnx-software.com/2020/11/10/ttgo-t-higrow-is-a-wifi-blue

ESP32 and soil sensor combo. Battery powered but rigging a solar panel might be possible. https://www.cnx-software.com/2020/11/10/ttgo-t-higrow-is-a-wifi-bluetooth-connected-soil-temperature-moisture-sensor/ https://www.cnx-software.com/2020/11/10/ttgo-t-higrow-is-a-w...