SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
TV remote control keypad and the internal electronic circuitry. When a button on the keypad is pressed its conductive base connects with the corresponding contact point on the printed circuit board, completing a circuit to the microcontroller which creates a coded command signal. This is transmitted as infra-red light by the I-R light emitting diode (LED) at the top of the control to the sensor on the TV receiver or set-top box where it is decoded.
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