RaspberryReef automates the refill process and measures temperature of private reef aquariums. The application is written in JavaScript with Node.js and runs on a Raspberry Pi 3 B+.
Monitoring water levels to help automate water storage (tank 2 sensor being installed) and site temp/humidity..
Ping sensors on house rain water tank, pressure feed tank, fish farm tank.
Water softener salt level monitor. Sensor uses ESP8266-12 & HC-SR04 ultrasonic sensor. Remote uses ESP8266-12e & Nokia 5110 LCD to display the level.
Ultrasonic sensor for measuring level of water in my cistern, not that acurrate, sometimes may drift due to humidity, temperature or just cheap sensor!
Municipal potable water tank monitoring: the system consists of a Raspberry B+ with UPIS power backup, a Teltonika twct22 controller, a USB<-->RS232 converter and a 3G USB stick (huawei modem firm), recorded parameter is 3G signal, refresh rate ~20sec
Propane tank level as measured by a ratiometric hall effect sensor mounted over the tank's analog dial gage. Uses an Arduino Mini Pro and an ESP8266 Wi-Fi module, powered by a 3.2V LiFePo4 battery and solar cell.