![]() Now we will write the code to enable serial data communication. TX wires Green, RX wires Blue, +5v wires are red, GND wires are black Program the Arduino Connect the ground line from your computer to ground on the breadboard. Heatshrink the wire connections to avoid accidental shorts.Įnclose the connector in a backshell to further protect the signal and enable easy unplugging from your serial port.Ĭonnect the TX line from your computer to pin 8 (R1IN) on the MAX233 and the RX line to pin 7 (T1OUT). 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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