Isolated RS232C for PIC16F84

Posted on Mar 30, 2013

Another method that helps program development besides a dot LED as the output device is a serial bit. With a serial transmission to a terminal emulator program, developer may then test program running easier than a dot LED. One of my circuit uses PIC16F84 having one bit for sending ascii character with `printf` function. The PIC16F84 provides a very convenient way of connecting serial data to terminal. We may use a 1K resistor connects RB1, say to RxD pin of COM1 directly. As shown above diagram, my PIC circuit uses a transformerless DC supply. Direct connection is then not recommended for safety. The ground voltage difference between two circuits may destroy the RS232 converter chips.

Isolated RS232C for PIC16F84
Click here to download the full size of the above Circuit.

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