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Case Study: Infra-red Module for home automation

By Muhammad Omer 5 years ago

Designed in 2001 for AXA design Australia, the project connected Infrared transmission and reception capabilities to an existing home automation network. The user would place an IR remote, say of a TV infront of the device and trigger it to memorize a certain button (say volume +). The device would store a series of these in memory and transmit these to the TV on a command (say to mute the audio in the home entertainment system when a door bell rang)



The solution consisted of an IR De-modulator that removed IR noise (anything not modulated at 40KHz or so) and passed on a clean, un-modulated signal to an ATMEL 89S51 micro-controller. The controller monitored the de-modulators output and stored the wave form in memory. Product vendors vary greatly in the wave-form used in remotes. Two major classes are Sony (where the save waveform is repeated continuously as long as the button remains depressed) and Hitachi (where one wave is sent on button press and another is sent repeatedly as long as the button remains pressed. The micro-controller was connected to a Windows application that was used to configure the device. The controller and the device communicated with a serial link.

The controller also contained drivers for a custom home automation network (HAN) protocol. When the controller received a signal on the HAN network. It would generate a modulated wave form through the controller output pins (which were in turn connected to an IR transmitter).

The solution provided the ability to retrofit and control any device that uses IR remotes (e.g. Air conditioners, TVs, entertainment systems etc.) from a centralized smart home automation system. The first version of the system was developed in 2001 and releases have been in production throughout Australia since.



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 Muhammad Omer

  (148 articles)

Muhammad Omer is the founding partner at Allied Consultants. Areas of interest for him are entreprenuership in organizations, IT Management, Integration and Business Intelligence.