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This document describes how to add an serial interface to an AVR.
Most of the AVR devices have a serial port, often called UART. But for interfacing with RS-232 devices, such as the COM port of a PC, a converter is necessary which converts the CMOS/TTL signals of the AVR to RS-232 compatible signals.
A standard 9-pol modem serial cable is used to connect with the COM port of the PC.
Parts List |
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| 1 | +5V R232 Transceiver | Maxim MAX232 | Datasheet (PDF) |
| 5 | Tantalum Capacitor | 1uF/20V | |
| 1 | DB9 Connector | any | |
| 1 | Modem Serial cable (straight through) with DB9 Connectors | any | |
My UART library the AVR-GCC provides an easy interface to the UART.
� Copyright 2002 Peter Fleury e-mail [email protected] home page: http://jump.to/fleury