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Arduino Notes

Serial I/O

stty settings

First, test that the code works with the built-in Arduino Serial Monitor. While that's running, you can use stty to snoop on the tty settings. Replace /dev/cu.usbmodem1451 with the path to the Arduino device.

sudo stty -g -f /dev/cu.usbmodem1451 >> stty_settings.sh

Those settings can now be replayed as part of code that accesses the serial port.

Using echo and scripts

echo "cmd" > /dev/cu.usbmodem1451

Echo typically closes the device after issuing the command, and before waiting for a response. This causes the Arduino to reset.

One way to get around this is mentioned in this video on Arduino Serial PHP Fix. The solution described there (and other places) is to put a 100 Ohm resistor between the reset pin and the +5V pin on the Arduino. This solution didn't work for me.

Another approach that worked in my case was to use a 100 uF capacitor between the reset and ground pins. This is described at the bottom of this forum post on using Bash to send commands to Arduino.