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====== Testing the Existing Volume Control Circuit ====== {{ :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. 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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