This simple water level indicator will activate an active buzzer (e.g. BeStar BPT-23CX ) in order to make a noise when a certain level of water is being reached. Because the water sensor and the ...

As the top sensor goes low (water above level C), the CLR signal is activated and the output of the flipflop is low. This allows Q1 to turn on and activate a triac or relay for the pump.

By itself, the distance sensor wouldn’t do much so [David] made his own PCB Board to hold all the necessary circuit components. The brains behind the operation is an Atmel ATtiny861 20 pin ...

Posted in green hacks Tagged alarm, led, level, meter, transistor, water ← Autonomous RC Car Navigates By Waypoints Hackaday Links: Sunday, June 16th, 2013 → ...

The noninverting input (pin 2) is connected to sensor B through R1 for lower-level detection of the water. The open collector of the built-in transistor (pin 7) is connected to the +12-V terminal.

In the water level sensor schematic, the common probes connecting the underground tank and the overhead tank to +9V supply are marked ‘C’. The other probe in underground tank, which is slightly above ...