IR receiver
The IR receiver module is for use with TV remote control handsets or with a second picXplorer system that transmits IR commands using the InfraOut box. The module detects short pulses of infra-red modulated at 38Kz. Data is encoded by the spacing of the infra-red pulses. i.e. different buttons on the remote control handset produce different timings between pulses.
IR receiver PCB layout
Circuit details
IR receiver design symbol
IR receiver circuit details
The IR receiver outputs a low signal when receiving infra-red modulated at 38KHz. The active device, the TSOP4838, is only sensitive to short bursts burst of infra-red so it must be complemented with an appropriate transmitter such as a TV remote control handset. Alternatively, a suitable signal can be generated by a 38 KHz astable enabled and disabled by a slow astable switching at 10 Hz. D1 and C6 ensure that noise on the power supply lines do not affect operation of IC4.
Programming
