Tasmota + HC-SR04 + NodeMCU = a pellet level sensor that finally works the way I want it to.
https://t.co/qkraVaVLx4
#Tasmota#ESP8266#IoT#MQTT#TasteTheCode
Electrical noise ruining your power switch? An optocoupler fixes that by fully isolating both circuits.
https://t.co/BsZacgNF0C
#electronics#optocoupler#PCBdesign