IR Communication. Contributors: a1ronzo Share Use this URL to share: Share on Twitter Share on Facebook Share on Google+ Getting Started Transmitting IR LED (left) and receiving IR photo sensor (right) IR, or infrared, communication is a common, inexpensive, and easy to use wireless communication technology. IR light is very similar to visible light, except that it has a slightlty longer wavelength. This means IR is undetectable to the human eye - perfect for wireless communication. For example, when you hit a button on your TV remote, an IR LED repeatedly turns on and off, 38,000 time a second, to transmit information (like volume or channel control) to an IR photo sensor on your TV.
This tutorial will first explain the inner workings of common IR communication protocols. All of the gritty signal processing is handled by a great Arduino library written by Ken Shirriff and allows you to easily send and receive IR data. Here are some concepts that we will be covering in this tutorial. IR Communication Basics. Control your HVAC Infrared Devices from the Internet with IR Remote (Arduino / Raspberry Pi Compatible) IR Remote is a small shield that allows you to record any infrared command sent by a remote control and resend it from the Internet. It works connected to Arduino and Raspberry Pi, and let us to control any HVAC system including heating, ventilation, air-conditioning and thermostats from the Cloud.
We offer 6 different wireless interfaces to connect Arduino and Raspberry Pi to the Internet: WiFi, 3G, GPRS, Bluetooth and 802.15.4 / ZigBee. With IR Remote you can easily control our home HVAC system from a laptop, a webserver or even from your smartphone. The shield is compatible with both Arduino and Raspberry Pi so you can choose your favourite platform to automate your home. IR Remote Shield over Arduino (left) Raspberry Pi with the connection bridge (right) HVAC applications Your home's HVAC system includes a number of heating, cooling, and ventilation components controlled with infrared technology that all work together to make your indoor living spaces more comfortable. Features Show Code. IR Sensor. IR detectors are little microchips with a photocell that are tuned to listen to infrared light. They are almost always used for remote control detection - every TV and DVD player has one of these in the front to listen for the IR signal from the clicker.
Inside the remote control is a matching IR LED, which emits IR pulses to tell the TV to turn on, off or change channels. IR light is not visible to the human eye, which means it takes a little more work to test a setup. There are a few difference between these and say a CdS Photocells: IR detectors are specially filtered for Infrared light, they are not good at detecting visible light. In this tutorial we will show how to These stats are for the IR detector in the Adafruit shop also known as PNA4602. As you can see from these datasheet graphs, the peak frequency detection is at 38 KHz and the peak LED color is 940 nm. Try to get a 940nm - remember that 940nm is not visible light (its Infra Red)! IR-RemoteControl. Here's the pinout for almost every 3-pin IR Receiver: (Below, Left) is a link to a typical IR Receiver Spec Sheet: (Above): a diagram of connecting the receiver to an Arduino.
You can get these HERE. There are many different manufacturers of IR Receivers and some have different pinouts: Image courtesy of Alberto Piganti. See: There is also an easy-to-connect IR Receiver Electronic Brick like this (right). DETAILED IR REMOTE CONTROL INFORMATION (THANKS! Note: The following library must be installed in your Arduino installation for this to work! CLICK HERE - IR REMOTE CONTROL: ARDUINO LIBRARY Unzip folder into Libraries. There are many different IR remote controls. EXAMPLE: The YourDuino.com IR Infrared Remote Control Kit 2 Below is the IR Remote Control Kit connected to a YourDuinoRobo1 with a 3-pin cable. Test Arduino Software Sketch for IR Infrared Remote Control Kit 2 (TESTED!!) OTHER IR Remote Kit Test Sketches (Click to Download): A Multi-Protocol Infrared Remote Library for the Arduino.
Do you want to control your Arduino with an IR remote? Do you want to use your Arduino to control your stereo or other devices? This IR remote library lets you both send and receive IR remote codes in multiple protocols. It supports NEC, Sony SIRC, Philips RC5, Philips RC6, and raw protocols. If you want additional protocols, they are straightforward to add. To use the library, download from github and follow the installation instructions in the readme. How to send This infrared remote library consists of two parts: IRsend transmits IR remote packets, while IRrecv receives and decodes an IR message. #include <IRremote.h> IRsend irsend; void setup() { Serial.begin(9600); } void loop() { if (Serial.read() ! This sketch sends a Sony TV power on/off code whenever a character is sent to the serial port, allowing the Arduino to turn the TV on or off. How to receive IRrecv uses an infrared detector connected to any digital input pin.
Hardware setup Some background on IR codes Handling raw codes.