Water Level Control/Monitor.

Source: http://www.josepino.com/?water_level   Tags: diy circuits microcontroller

CODE: JP6751 - PIC: 12F675, FUSE CONFIG Internal OSC

I was thinking about this proyect for many days. I was wondering "Why some people is asking for this circuit?" I found this kind of project have a cost from $ 300.00 to $ 1,200.00 USD.
Taken from http://www.josepino.com
I found some similar circuits but aren't good enough for me. Some circuits measure the water's resistance to determine the level. That is dangerous for drinking water (contamination) or explosive liquids because electricity is in contact with water.

So... How I can measure the water lever without contaminate or without danger when use with explosive liquids?

Let's see the schematic:

How this Works:

The Pressure sensor have a tube. The tube end on the botton of the tank. When the liquid fill the tank, the pressure inside the tube increase. The 12F675 have A/D converters. The PIC measure the pressure and light up the led corresponding to the liquid level. Green LED = Full, Yellow = Half, Red = Almost Empty. When the tank is completely empty, It turn on the Water pump or activate the buzzer.

Before using the circuit, you have to calibrate it. First, start filling the thank (just one or two inches) and press the switch on the RED led (Empty). Fill the thank to the half and press the switch on the YELLOW led. Finally, when the tank is full, press the swith on the GREEN led. The water pump will stop. When the tank is almost empty the PIC will turn on the pump until the liquiq level reach the top.

Download the HEX file HERE

USE ANY RESISTIVE PRESSURE SENSOR, JUST CHECK THE SENSOR WORKS WITH 5 Volts.

Update: I found that washer machines uses this method to determine the water level, however, the pressure sensor in a washer machine is not a resistive one, is just a switch.

10/12/09 - 12:35:00 LUCA from ITALIA wrote: NO MEMORY LEVEL IMPOSTATED, THE OFF CIRCUIT IS RESET.
IS POSSIBLE THE FILE AMS.
TANKYOU!  
E-MAIL
LUMBO@INTERFREE.IT
10/12/09 - 15:51:02 José Pino wrote: Luca, Scrivi il tuo messaggio in italiano.
11/12/09 - 12:24:27 luca from ITALIA wrote: CIAO! HO REALIZZATO IL CIRCUITO CONTROLLO LIVELLI CON IL PIC12F675, FUNZIONA TUTTO , MA HO TROVATO IN PICCOLO DIFETTO, QUANDO TOLGO L'ALIMENTAZIONE LE IMPOSTAZIONI CHE HO IMPOSTATO SI SMEMORIZZANO, C'E' LA POSSIBILITA' DI TENERLE IN MEMORIA SENZA METTERE UNA BATTERIA TAMPONE.
GRAZIE LUMBO@INTERFREE.IT
11/12/09 - 15:40:12 Emil from Bucharest wrote: You tried to use a piezoresistive sensor MPX?
11/20/09 - 04:24:53 sujil from Nepal wrote: can i use mpx2010dp pressur sensor for this circuits?

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