IR LED Receiver and transmitter

There have kinds of IR LED receiver and transmitter available in our factory, SMD type or through-hole type.

Package like 3528 SMD IR LED, 2835 SMD IR LED, High Power IR LED, 5050 SMD IR LED are available in SMD LED type. And for through-hole LED, package like 3mm through-hole IR LED, 5mm through-hole IR LED are all available.

In addition, there also have different lens are available such as blue lens, black lens or clear lens. Just feel free to let us know which lens can meet your application more~

IR LED, we also name it as Infrared transmitters. IR LED transmitters and receivers exist in many different devices, although they are most common in consumer electronics. The way the technology works is that one component flashes infrared light in a specific mode, and the other component can pick up the infrared light and convert it into instructions. These transmitters and receivers are located in the remote control and all different types of devices, such as TV and DVD players. The peripheral devices containing this technology can also enable the computer to control a variety of other consumer electronic products. Since the infrared remote control is limited to line of sight operation, some products can be used to extend the signal through hard wire transmission.

The most common consumer electronic remote controls use infrared light. They usually use light-emitting diodes (LEDs) to generate infrared light, and the main component of the receiver unit is usually a photodiode. The remote control flashes the invisible light pattern, which is picked up by the receiver module and turned into an instruction. The parts needed to construct transmitters and receivers are usually cheap, but these systems are limited to line of sight operation.

An IR transmitter contains an LED that emits infrared light. Thus the name. The receiver contains either a photodiode or a phototransistor (usually the latter). This component passes more or less current depending on the amount of IR light falling on it.

The LED is switched on and off in a coded sequence. A microprocessor or a special IC connected to the phototransistor decodes the sequence to recover the original data.

It's not normally as simple-minded as LED on = 1, LED off = 0. Most systems modulate the LED at a higher "carrier" frequency. The carrier is switched off. This makes the signal easier to distinguish from slower-changing background sources.

Still it's not like carrier on = 1, carrier off = 0. (This is called NRZ.)

Different coding methods are used and a system called Manchester is common. Coding systems like this help the receiver synchronize its timing to the transmitter bit stream. For instance, if you just used NRZ coding, and you had a long string of zeroes, there would be no signal at all. In Manchester, long strings of zeroes or ones still result in a series of pulses.

The carrier frequency for the vast majority of IR remote controls is 38 KHz or something near.