This project is IR Transmitter and Receiver Circuit using 555 and 4017 IC.
It has two parts transmitter and receiver.
Transmitter sends IR signal.
Receiver catches signal and turns relay ON or OFF.
It can control small home device without wire.
Circuit Working for IR Transmitter Circuit :
Parts List for IR Transmitter Circuit:
| Component Name | Value / Type | Quantity |
|---|---|---|
| Resistors | 1k 1/4 watt | 1 |
| 560Ω 1/4 watt | 1 | |
| Capacitors | Ceramic 18nF | 1 |
| Ceramic 33pF | 1 | |
| Ceramic 100nF | 1 | |
| Semiconductors | IC 555 Timer | 1 |
| Standard IR Transmitter LED | 1 | |
| Tactile Push Button Switch | 1 | |
| Power Supply 9V Battery | 1 |
In the above circuit diagram the IC 555 works in a monostable multivibrator mode.
In this mode the IC 555 stays OFF normally.
Output pin 3 is LOW when no switch is pressed.
When we press the switch the pin 2 gets a low trigger.
555 wakes up and starts timing.
The timing capacitor C1 starts charging through resistor R1.
During this charging time the pin 3 becomes HIGH.
So IR LED glows for that time.
After capacitor finishes the charging, voltage on C1 reaches the limit.
555 automatically turns output pin 3 LOW again.
IR LED turns OFF.
If we press switch again then process repeats.
So one press gives one pulse of IR light.
Pulse ON time depends on:
T = 1.1 × R1 × C1
Bigger R1 or bigger C1 gives longer IR ON time.
How to Build IR Transmitter Circuit:
Below is the connection steps for IR Transmitter Circuit:
- Gather all parts as shown in circuit diagram.
- Pin 1 of IC555 goes to ground.
- Pin 2 connects to one end of C2 and other end of C2 to ground.
- Pin 3 connects to IR LED through R3 and then to ground.
- Pin 4 and pin 8 go to +9V supply.
- Pin 5 connects to one end of C3 and other end to ground.
- Pin 6 and pin 7 join together.
- R1 connects between +9V and pin 6 and 7.
- C1 connects between pin 6 and 7 and ground.
- Switch connects at +9V to send signal only when pressed.
Circuit Working for IR Receiver Circuit:
Parts List for IR Receiver Circuit:
| Component Name | Value / Type | Quantity |
|---|---|---|
| Resistors | 560Ω 1/4 watt | 1 |
| 10k 1/4 watt | 1 | |
| 1k 1/4 watt | 1 | |
| Semiconductors | IC CD 4017 | 1 |
| Transistor BC547 | 1 | |
| Diode 1N4007 | 1 | |
| Standard IR Receiver LED | 1 | |
| Relay SPST 12V | 1 | |
| Power Supply +12V DC | 1 |
The above circuit diagram is for IR receiver circuit.
It uses IC 4017 decade counter and transistor BC547.
When IR light falls on the photodiode, it produces a small voltage.
This signal goes to IC 4017 through R3.
IC 4017 counts the input pulses and gives output.
The output drives transistor Q1.
Q1 transistor operates the relay.
Relay switches ON or OFF any external load.
Normally, when there is no IR light then photodiode gives no signal.
IC 4017 stays in reset condition.
When IR light comes then input pulse goes to pin 14 of IC 4017.
IC gives output high on pin 2.
This output goes to base of Q1 through resistor R2.
Q1 conducts and energizes relay coil.
Relay contacts switch connected device.
How to Build:
Below is the connection steps for IR Receiver circuit:
- Gather all parts as shown in circuit.
- Pin 2 of IC 4017 goes to base of Q1 through R2.
- Pin 4 and pin 15 join together.
- Pin 8 goes to ground.
- Pin 13 also to ground.
- Pin 14 goes to anode of IR receiver LED.
- Cathode of IR LED goes to +12V.
- Pin 16 connects to +12V supply.
- R1 connects between R3 and ground.
- Diode D1 connects between relay coil and collector of Q1.
- Collector of Q1 goes to relay coil.
- Other coil end goes to +12V.
- Emitter of Q1 goes to ground.
Conclusion:
This project shows easy way to make wireless remote with IR.
Transmitter sends small IR pulses.
Receiver catches pulse and turns relay ON.
We can control fan, lamp, small gadget.
It is cheap project, easy to make and is good for beginners.