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Pellet level monitor for Home Assistant with HC-SR04 and ESP8266

In this video, I'm creating a pellet-level monitor for my pellet-burning boiler, so I can track how much pellets I have left in the storage tank. The device is made with an HC-SR04 ultrasonic distance ...
Geeky Gadgets

HC-SR04 ultrasonic sonar distance sensor arrives at Adafruit

Makers, developers and enthusiasts building distance related projects may be interested to know that the HC-SR04 ultrasonic sonar distance sensor is now available to purchase directly from the ...