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copied!<p><a href="http://pyserial.sourceforge.net/" rel="nofollow">pySerial</a> may or may not be built in to Python. Regardless, if it's not, pySerial is the library to download and install.</p> <p>And since you already know the Arduino is on COM3, just use this:</p> <pre><code>import serial ser = serial.Serial("COM3", 19200, timeout=1) ser.write("Whatever") </code></pre> <p>For a Linux box, it's relatively easy to find out what serial port your Arduino is using:</p> <pre><code>dmesg | grep tty </code></pre> <p>This will give you some output similar to this: <code>[ 7.944654] usb 1-1.6: FTDI USB Serial Device converter now attached to ttyUSB0</code></p> <p>So my Arduino is on ttyUSB0. This means you can use the following code to talk to the Arduino on a Linux box:</p> <pre><code>import serial ser = serial.Serial("/dev/ttyUSB0", 19200, timeout=1) ser.write("Whatever") </code></pre> <p>Note: If you use a baud rate of 9600 on the Arduino, as most people do, you can simply use <code>serial.Serial("COM3")</code> or <code>serial.Serial("/dev/ttyUSB0")</code> without any other parameters.</p> <p>EDIT: You should also keep in mind that in the real world, it may take a second to actually open the port and get it ready for transmitting data. This means that performing a write IMMEDIATELY after the serial.Serial() call may not actually do anything. So the code I would use is as follows:</p> <pre><code>import serial import time ser = serial.Serial("/dev/ttyUSB0", 19200, timeout=1) time.sleep(1.5) ser.write("Whatever") </code></pre> <p>Kind of a hack, but it's the only way I know how to get it to work on my system.</p>

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