A no frills dual tank water level monitoring solution incorporating:
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ESP8266 low power ultrasonic measurer remote monitor and reporter device for dual tank setups [tankmon-probedual] Open this in Arduino, ensure that ESP8266 is installed as per the Adafruit esp8266 arduino guide
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PHP server receiver and graph display tool [tankmon]
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OpenSCAD construction for Ultrasonic case and ESP8266/NODEMCU case [tankmon-cases]
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Circuit Design and construction for remote monitor circuit and board pcb in KiCAD [tankmon-pcb]
A demonstration exercise in, simplifying workflows and modularity, utilising Arduino, NodeMCU, KiCAD, OpenSCAD.