Common Remote Control Receiver Circuit (RC5 SIRC NEC) - 16F683

General Remote Controller

The cheapest way to remotely control a device within a visible range is via Infrared light. Almost all audio and video equipment can be controlled this way nowadays. Due to this wide spread use the required components are quite cheap, thus making it ideal for us hobbyists to use IR control for our own projects.

If you ever want to open your gate or run any other device via remote controller you can use this circuit for that. IR remote control receiver for controlling home appliances can be easily made using PIC micro-controller. By using below circuit you can easily control your home appliances using your TV remote, DVD Player remote control or any other remote.

Remote Control Receiver Schematic

The main part of this remote control receiver circuit is PIC16F683. It is cheap and tiny. For infrared receiver I used TSOP1730. However, you can use any other infrared receiver for it (TSOP12xx, TSOP48xx and TSOP62xx product series).

The TSOP1730 used to capture infrared ray from the remote. This infrared receiver changes its output according to the received infrared ray. The output of TSOP1730 then connected to the micro-controller and it decodes the IR signal and gives necessary output according to the IR signal. This circuit is support to Sony, Philips and NEC (I hope, only tested with Sony and Philips) protocols and you can use any remote controller to operate this circuit.

When power is applied, D1 LED will light up. This LED indicates that power is applied. When receiver get IR signal from remote controller then D2 LED light up for 250ms and then off and D3 LED toggle its state. If you need to control heavy load then remove D3 LED and connect transistor and/or relay with this pin. And if you need to switch something like counter then you can used pin 7 (D2 LED) for that.

Sony SIRC Protocol

Sony Protocol

The SIRC protocol uses a pulse width encoding of the bits. The pulse representing a logical "1" is a 1.2ms long burst of the 40kHz carrier, while the burst width for a logical "0" is 0.6ms long. All bursts are separated by a 0.6ms long space interval. The recommended carrier duty-cycle is 1/4 or 1/3.

NEC Protocol

NEC Protocol

The NEC protocol uses pulse distance encoding of the bits. Each pulse is a 560µs long 38kHz carrier burst (about 21 cycles). A logical "1" takes 2.25ms to transmit, while a logical "0" is only half of that, being 1.125ms. The recommended carrier duty-cycle is 1/4 or 1/3.

Philips RC-5 Protocol

Philips Protocol

The protocol uses bi-phase modulation (or so-called Manchester coding) of a 36kHz IR carrier frequency. All bits are of equal length of 1.778ms in this protocol, with half of the bit time filled with a burst of the 36kHz carrier and the other half being idle. A logical zero is represented by a burst in the first half of the bit time. A logical one is represented by a burst in the second half of the bit time. The pulse/pause ratio of the 36kHz carrier frequency is 1/3 or 1/4 which reduces power consumption.

Common IR Receiver

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Infrared Remote Control Transmitter and Receiver Circuit - 16F628 12F683

Updated [Sep 14, 2014]

• Fixed some bugs on IR_Tx.hex
• Increased Accuracy

This is a general purpose remote control project with 16 channels and using PIC16F628 for transmitter & 12F683 for receiver side. Remote controls usually consist of encoder/decoder parts connected to a transmitter/receiver module which takes care of the transmission of digital signals by radio or infra waves.The transmitter has a varying number of buttons and sends the states of these inputs to the receiver. The receiver device decodes the message and sets the outputs accordingly. To get individual out put from receiver you need to connect 4 to 16 decoder like CD4067, 74HS154 etc or you can use another programming ic. Receiver has two versions. chose better one for your task.
I used Proteus 8 for designing. so if you are already used older version, it is not supported to open this files. All the files can be download from below.

Transmitter Circuit

The TX use 16 pin PIC devices, PIC16F628A is the main part of the transmitter run at 4 MHz crystal. Actually, this device has 4MHz RC internal oscillator but not suitable for use with the project that need critical time as remote control. This ic used to send IR command to receiver. It also generate 38KHz carrier frequency and information bit.

You can use 2xAA size batteries or CR2016 battery or 5v for the circuit. For saving power when use with battery powered we need to increased battery life. Therefore when any keys not pressed within 30 seconds the CPU go to SLEEP mode to reduce battery power consumption and wake-up only when any key pressed. To wake-up the CPU from SLEEP mode the CPU use interrupt on change feature which interrupted when the state on PORTB change, then the program execution after an interrupt is at the interrupt vector, if the global interrupt is not enabled, the program starts executing the first line of code right after the SLEEP instruction.In the interrupt service routine the software will scan the key that pressed and send IR command appropriate with key pressed.

Schematic of Transmitter

Receiver Circuit

The receiver used low cost 8 pin PIC16F683 to control all function of receiver side. The IR was received from TX will demodulated by this ic. When power is applied to circuit the CPU will polling the IR input signal which is the output from IR decoder module (TSOP1736). After IR received the CPU decoding the IR command and then turn on/off appropriate channel.

Ex:
If press 1 on TX then RX out put will be A=1, B=0, C=0, D=0
If press 2 on TX then RX out put will be A=0, B=1, C=0, D=0
If press 16 on TX then RX out put will be A=1, B=1, C=1, D=1

For IR decoder module alternatively you can used TSOP48XX series or any common module.
Connect 4 to 16 decoder with A, B, C and D to get all the out puts.
Supply voltage is 5v (Max).

Schematic of Receiver

PIC12F683 Datasheet
PIC16F628A Datasheet

Pin Connection

IR Receiver
IR Transmitter

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