Infrared sensor


Infrared, sometimes called infrared light, is electromagnetic radiation with wavelengths longer than those of visible light. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from the nominal red edge of the visible spectrum around 700 nanometers, to 1 millimeter.


Simply said, an infrared connection is communication between an infrared receiver and emitter. The infrared emitter sends pulses of infrared light to the receiver. Infrared light is used because it has less problems with interference than other types of light in the visible spectrum. Usually, there are only two devices in the connection, but the system still needs a computer name and a common protocol.

The computer name is needed in case there are multiple devices in the range of the connection. This way, the right devices can be selected for the connection. The use of the protocol has to be explained with the way the devices recognize the infrared signal. A chip inside the device analyses the infrared pulses that come in to detect any patterns. If a pattern is recognized, the appropriate action is executed. In computing devices, these patterns are binary codes. If the infrared light of the emitter is activated, it is sending a binary 1 and if it is off it is sending a 0. The protocol ensures that both devices use the same frequency and packet length for the codes to avoid miscommunication.


Infrared transmission uses the frequency range from 300GHz to 400THz to carry signals. We use infrared transmission to transfer data between mobile phones and laptops and between a laptop and a wireless mouse or a keyboard.

Where is infrared connection used?

Infrared connection is used in the following processes: wireless technology which is used in intrusion detectors; home-entertainment control units; robot control systems; medium-range, line-of-sight laser communications; cordless microphones, headsets, modems, and printers and other peripherals. Unlike radio-frequency (RF) wireless links, IR wireless cannot passthrough walls.

How is infrared transmitted?

It comes from the heat and thermal radiation, and it is not visible to the naked eyes. In infrared transmission, senders can be simple light emitting diodes (LEDs) or laser diodes. Photodiodes act as receivers. Infrared is used in wireless technology devices or systems that convey data through infrared radiation.

What is the difference between Bluetooth and infrared?

Infrared wireless uses pulses of infrared light to transmit data from one device to another. … Bluetooth wireless uses radio waves on a particular frequency (2.4 gigaHertz) for data transmission from device to device. Both Bluetooth and infrared consume considerably less power than other wireless technologies.

What advantages does Bluetooth offer over infrared?

 Bluetooth has longer range than infraredBluetooth is also able to transfer more data than infrared. The last advantage of Bluetooth over infrared is, there is security.

What are the advantages and disadvantages of infrared?

1) Infrared transmission requires minimum power to operate and can be set up at a low cost. 2) This is a secure way to transfer data between devices as the signal cannot pass beyond a room or chamber. 1)The speed of data transfer in infrared is slow. 2) Infrared can be used for a small range distance.


1)The speed of data transfer in infrared is slow.

2) Infrared can be used for a small range distance.

3) Infrared signals are interpreted by objects and people.

4) These signals are impacted by weather conditions.


Author: refuge_2020

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