This is a wireless tank level monitor I threw together for monitoring our house rain water tank level which is about 60m up the hill from the house. It runs on a couple of arduino pro mini's and uses a ultrasonic sensor to detect the water level. The components are as "cheap as chips" and is a bit of fun to put together.
It consists of a solar powered transmitter which sits on top of the water tank and senses the water level, then converts it to % full. This is then transmitted to a hand held receiver which, when the button is pushed, displays the water level %.
The Tx is straight forward. The Trigger pin of HC-SR04 goes to pin 10 of pro mini while the echo pin goes to pin 9. The data pin of the radio Tx goes to pin 12 of pro mini. All power is routed through a buck converter set to 5v to the pro mini, HC-SR04 and radio Tx. The reason for the buck coverter is because the HC-SR04 reportedly has a max voltage of 5.5v so might as well run everything off the buck. I also added a 99mm x 89mm 6v solar panel which I already had lying around. If you cannot find one this size, either design your own mount or let me know the sizes and I will draw one for you.
Female header pins are used under the Pro Mini so it can easily be removed for uploading sketches.
You will need to download the radiohead library for the arduino ide before you can upload the sketches.
The Receiver is a wee bit more complicated but still easy to understand. Just look at the jpg of the veroboard layout for how I put it together.
I used 4 x AAA batteries for the RX and used a momentary push button switch on the battery + . Just press and hold the button until pro mini boots and you get a reading.
Of course you are welcome to make any changes you want as this is just how I wanted it set up and may not suit you.
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