Water level monitor using open-source microcontrollers (Arduino, ESP8266, ESP32) and ultrasonic sensors HC-SR04 / JSN-SR04T and similar with Trigger and Echo signals. Arduino Core & ESP-IDF ...

An ESP32 based water softener salt level sensor. Uses the HC-SR04 ultrasonic distance sensor to measure the salt level in the brine tank.. The level is published to an MQTT broker configured in the ...

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