Installed an oil tank level monitor in Tola Park yesterday.
Based on a HC-SR04 ultrasonic sensor and an ESP8266 NodeMCU module and code from:
https://www.instructables.com/id/Distance-Measurement-Using-HC-SR04-Via-NodeMCU/
It publishes to MQTT which can then be displayed as a graph using Node-Red
Based on a HC-SR04 ultrasonic sensor and an ESP8266 NodeMCU module and code from:
https://www.instructables.com/id/Distance-Measurement-Using-HC-SR04-Via-NodeMCU/
It publishes to MQTT which can then be displayed as a graph using Node-Red
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