INTRODUCTION TO SIMPLE IR REMOTE SWITCH CIRCUIT
Most of the Remotes used in our home appliances are based on IR (INFRARED).
INFRARED rays are a part of Frequency Spectrum, in which they lies just below the visible light.
So we can't be able to see them with our naked eyes.
If you wants to see an INFRARED ray, just press and hold a button on your tv remote and point its led to a camera and you can see the ray on screen. I think you already know that.
Ok. Right back to our topic,
It is quite easy to control an appliance with a remote, isn't it.....? Yeah.
And It is not a difficult task to make an appliance controlled by a remote.
Now i am going to demonstrate you with an LED, just turn ON and turn OFF.
Figure shows the Circuit Diagram of IR REMOTE SWITCH
REMOTE SWITCH CIRCUIT EXPLANATION
The main part of this circuit is IR sensor TSOP 1738. TSOP IR sensor is a three Terminal device its pin configuration is shown in the figure.
The output pin (3) goes low when it receives sufficient amount of IR rays.
This decrease in output voltage is fed to the input (base) of the PNP transistor BC558, it is replacable with any PNP transistor.
The PNP transistor will increase its output while its Input goes low.
This output voltage from the collector is given directly to an LED with the help of a current limiting resistor.
PROCEDURE FOR WIRING UP THE REMOTE SWITCH
This circuit works finely on any common remotes in your home (38Khz).
Point the remote to TSOP 1738 sensor with correct line of sight and press any button of your remote. The LED will glow!!
Mount the circuit on PCB or Bread board
The circuit is powered by a 9V battery.
- Try to isolate the sensor from too much light, which may contain ir frequency and the circuit may get triggered
- To get best results point the remote on any sides of TSOP Sensor.