water level indicator.pdf

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How to make a Water Level Indicator & Controller using micro

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How to make a Water Level Indicator & Controller using micro

by Ashika » Wed Oct 02, 2013 4:42 am

Here is a simple, versatile project which indicates the level of water and automatically controls it by using PIC Microcontroller. The Water Level SensingSection senses the level of water in the tank and sends it (wireless) to the Receiver Section. Receiver Section is connected to the Controlling Section, which process the received information and produces visual, sound indications and controls the operation of the motor whenever required. The project is divide into 4sections.

1. Power Supply Section

Power Supply section provides required supply for Receiver and Controlling modules. Receiver module requires +5V power supply. Controller module requires+5v and +12v supply. Circuit Diagram:

1.png (25.35 KiB) Viewed 91 times

2.Water Level Sensing Section

Receiver Module is made of with HT12D decoder and ASK RF receiver.The data transmitted by the Sensor module is received by this module and is given tothe Controlling Module.

4. Controlling Section

Circuit Diagram :

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ASK RF Transmitter 2.jpg (65.57 KiB) Viewed 91 times

Level Sensor module is made of with HT12E encoder and ASK (Amplitude Shift Keying) RF transmitter. This circuit can be drive using 9V battery. This circuitis placed near the Water Tank and connected to the tank as show in the figure below.


3. Receiver Section

Circuit Diagram:





ASK RF Receiver 4.jpg (69.93 KiB) Viewed 91 times

Receiver Module is made of with HT12D decoder and ASK RF receiver. The data transmitted by the Sensor module is received by this module and is given tothe Controlling Module.

4. Controlling Section

Circuit Diagram :





Water Level Indicator Controller using PIC Microcontroller 5.jpg (91.77 KiB) Viewed 91 times

The soul of the Controlling Section is PIC16F877A. It process the data given by the Receiver Section. LCD Display, LED Indications and Motor status areupdated according to the data.

Working

For the transmission and reception of data we have used Holtek encoder-decoder pair of HT12E and HT12D. Both of them are CMOS ICs working voltageranges from 2.4 to 12v. The oscillator resistances are chosen according to the datasheet. When water level raises, the data pins of the encoder will be groundedcorresponding to the level of water, which will be transmitted to the Receiver via ASK RF module. The received data is decoded by the decoder HT12D. LEDon the receiver indicates that it is receiving data. Then the data is given to the PIC for processing.


When the water level becomes Very Low, the motor will turned ON, buzzer sounds and the LCD backlight will automatically turned ON for 5 seconds. Afterthis, when the water level reaches Full level, the motor will automatically turned OFF, buzzer sounds and the LCD backlight will automatically turned ON for 5seconds. During normal operation you can manually turn on LCD backlight by pressing the Push button switch. The LCD indicates the Level of water (‘VeryLow’, ‘Low’, ‘Medium’, ‘High’,'Full’) and the status of the motor (‘ON’ or ‘OFF’). The LED bar will also indicate the level of water.

Article courtesy of electrosome.com

Ashika

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