toolbox
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volume_control [2009/01/08 19:09] jonmash |
volume_control [2009/03/04 05:37] (current) jonmash |
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| ====== Testing the Existing Volume Control Circuit ====== | ====== Testing the Existing Volume Control Circuit ====== | ||
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| + | {{ :gallery:ir_sensor.jpg?150|IR Sensor}} | ||
| The transmitter to the TV uses a circuit that incorporates a 555 timer chip. The signal from the microcontroller is sent to the 555 timer reset input. This controls the output of a 40 kHz signal to an infrared LED. It was found that the existing timer outputs a signal with a frequency of 27kHz -- this is not sufficient for controlling a television. A new, improved, circuit will have to be developed. | The transmitter to the TV uses a circuit that incorporates a 555 timer chip. The signal from the microcontroller is sent to the 555 timer reset input. This controls the output of a 40 kHz signal to an infrared LED. It was found that the existing timer outputs a signal with a frequency of 27kHz -- this is not sufficient for controlling a television. A new, improved, circuit will have to be developed. | ||
| It was concluded that it would be simpler to create a whole new circuit, with the transmitter and receiver on separate boards. | It was concluded that it would be simpler to create a whole new circuit, with the transmitter and receiver on separate boards. | ||
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| + | ====== Software Development ====== | ||
| + | * [[IRDecode|Code to decode an IR signal using the SIRC protocol]] | ||
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Brought to you by: Liliane Barbour, Jonathan Mash and Mike Studli
With the support of: Dr. Hashtrudi-Zaad
