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| 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.
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| 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
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| 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
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| 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
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| 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.
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