Solder your TX wire to pin 2 of the DB9 connector, RX wire to pin 3 and Ground to pin 5.Ĭonnect pins 1 and 6 to pin 4 and pin 7 to pin 8. Pick three different colors of wire, one for TX, one for RX, and one for ground. To do this, pick up a female DB9 connector from radioshack. If you do not have one already, you need to make a cable to connect from the serial port (or USB-serial adapter) on your computer and the breadboard. ![]() TX wire Green, RX wire Blue, +5v wires are red, GND wires are black Cables Connect your RX pin (6) to MAX3323 pin 9 (R1OUT). Connect your TX pin (7) to MAX3323 pin 10 (T1IN). In this tutorial we will be using Arduino pin 6 for receiving and pin 7 for transmitting. If you are using polarized capacitors make sure the negative pins connect to the negative sides (pins 3 and 5 and ground).ĭetermine which Arduino pins you want to use for your transmit (TX) and receive (RX) lines. If you are using an LED connect it between pin 13 and ground.Ĭonnect a 1uF capacitor across pins 1 and 3, another across pins 4 and 5, another between pin 2 and ground, and the last between pin 6 and ground. Connect pin 15 on the MAX233 chip to ground and pins 16 and 14 - 11 to 5V. Connect 5V power and ground from the breadboard to 5V power and ground from the microcontroller. ![]() Insert the MAX3323 chip in the breadboard. Light emitting Diode (LED) - optional, for debugging.HyperTerminal or RealTerm on the PC, Zterm on Mac) ![]() Computer with a terminal program installed (ie.A general purpose software serial tutorial can be found here. In this tutorial you will learn how to communicate with a computer using a MAX3323 single channel RS-232 driver/receiver and a software serial connection on the Arduino.
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