Remote IR controller

This unit provide 2 way IR communications using a numeric keypad and an LCD display. Data is sent and recieved in ASCII with no regard to what the data means to any particular device. The ASCII data still needs some form of encoding. For this I chose 10-pulse coding of 38Khz IR using a nifty 99 cent receiver chip , TSOP4838 The transmitting is done with a straight IR LED with both carrier and coding done in software.
Remote IR controller - schematic

As you can see from the diagram below, the membrane switch and LCD display use up quite a few I/O lines even with some sharing of signals. This required the use of a larger (28pin) PIC for this controller. However, it means that the target device it controls needs only 2 I/O lines for sending and receiving the IR data. Although functional at this time, some features and nicities need to be added later.

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