Raspberry Pi Implementation

[Vanlon]

Is there any documentation on this on how to use it on a R Pi? I can get the serial output, but how do you access the menu. Possibly some example Python scripts.

[circuitmike]

I use one of these with a Raspberry Pi. The easiest way I found to do it was to use the pexpect library. For example, here's a snippet of code where I use pexpect to tare the scale:

    def tare(self):
        logging.debug('tare')
        self.lastTare = int(time.time())

        px = pexpect.fdpexpect.fdspawn(self.serialObject)
        px.expect('\n[-.\d]+,[a-z]+,[-.\d]+')
        px.send('x')
        px.expect('\n>')
        px.send('1')
        px.expect('Tare point 1: [-\d]+')
        px.expect('Tare point 2: [-\d]+')
        px.expect('\n>')
        px.send('x')

        i = px.expect(['\n[-.\d]+,[a-z]+,[-.\d]+', '\n>'])

        if i == 1:
            logging.debug('Stupid bug encountered - sending another x')
            px.send('x')
            px.expect('\n[-.\d]+,[a-z]+,[-.\d]+')
            logging.debug('Extra-x hack appears to have worked')

The "extra X hack" at the end there is because I'm using an old version of the OpenScale firmware that has a bug where sometimes hitting "x" at the menu doesn't exit, but just re-displays the menu, and you need to hit "x" again for it to actually exit. I should really update the firmware at some point...