This document describes an Arduino-based project to control devices using infrared signals. It involves the following steps: 1. Set up an Arduino board with an IR sensor, relay driver, LCD display, and power supply. 2. Write code to initialize the serial port and define output pins. The code waits for serial data representing which output to toggle and toggles the corresponding array element. 3. Expand the project to add an IR transmitter so that outputs can be controlled by IR codes received and sent by the Arduino through the IR sensor and transmitter.

1. Device Contol by IR
Arduino Based Project

2. Start with Hardware
Power Supply
Arduino
Relay driver
Serial/USB interface
LCD
IR

3. Block Diagram
Power
Supply
Touch
Arduino IR Sensor
Keys
IR
Transmitter
Serial Relay
LCD
Port Driver

4. First Step - setup
Initialise serial port
Define seven output pins , set them low
Define array with seven element, clear
all elements (put 0 there)

5. Second Step - Loop
Wait for serial data
Subtract Ascii code of ‘1’. if Value is 0 to
6. This is ‘I’, else display error message.
Toggle array element I
If new value is 00, Switch off output I,
else switch on output I
Display appropriate message on serial
port

6. Next step
Add LCD, IR
Display status of all seven outputs at
power on on LCD
When IR code is pressed, change output
and LCD Display.

7. Small Trick
Some students find it diffult to
understand how to toggle a output.
It is like this. When we press a key, we
change one Variable by exclusive oring
with Binary 1. So if it was ‘0’ after
pressing key it becomes ‘1’
Now we check variable, if ‘0’ we set
output off, if ‘1’ we set output on.

8. For More Details
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All data sheets and soruce code
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