从串行（FTDI）输入到php / python脚本

Question

I and some other people are working on a project that includes using an Arduino with an Ubuntu Server (running Ubuntu 10.04 64 bit). Currently we have the device connected and we can see the Arduino putting data in /dev/ttyUSB0. I can successfully cat it to another file.

We have a MySQL database that this information will be translated to, via either a python or php script. I need to know how to get the input from the serial port to be the input for that script. The device will be responding at least 20 times a second. The script essentially just needs to take whatever response it gets and insert the corresponding row to the MySQL database.

Has anyone done this before who could help out?

Answer 1

It seems you are doing just fine. You could directly open /dev/ttyUSB0 like a file in your code, but as write and read access should be done at a certain pace (serial baudrate, ...), it may be problematic (but still possible: I never tried it, but you can configure the TTY to directly write in it).

The missing link is you have to access /dev/ttyUSB0 like a serial port.

You mentionned Python: with it you can use PySerial . It also makes your code more portable toward other operating systems. A quick apt-get install python-serial or apt-get install python3-serial should work.

You have some examples in the Arduino playground :

import serial
ser = serial.Serial('/dev/ttyUSB0', 9600)
while 1:
    ser.readline()

There are plenty others in the PySerial introduction .