How to mollify the PC board to add an infra-red serial port to a microcontroller project

摘要

As we mentioned before, this PC board was designed to interface with the DSP Musicolour main board. But it can easily be modified to add a serial port to your next microcontroller project. The modified circuit diagram below shows a typical application. The levels at CON1 are only TTL levels, adequate for interfacing directly to most microcontrollers implementing a UART. Note that if you wish to interface the modified board directly to a PC, and need true RS232 voltage levels, you will need to add a MAX232 or similar IC to translate the TTL levels at CON1 to true RS232 levels (this is not shown in the circuit diagram).