watlow 0.1.0

Python driver for Watlow EZ-Zone temperature controllers.

watlow

Python driver and command-line tool for Watlow EZ-Zone temperature controllers.

Installation

pip install watlow

Usage

Command Line

$ watlow /dev/ttyUSB0

This returns a simple data structure.

{
  "actual": 21.66,
  "setpoint": 20.0
}

You can additionally use the --set-setpoint option to set a temperature setpoint. See watlow --help for more.

Python

The python interface is basic synchronous serial communication.

import watlow

tc = watlow.TemperatureController('/dev/ttyUSB0')

tc.set(30)
print(tc.get())

The driver is designed to be fault tolerant over long polling, and should appropriately reconnect if its IOErrors are managed. Here's an implementation with standard long-poll exception handling. This should run until interrupted and then exit cleanly.

from time import sleep

import watlow

tc = watlow.TemperatureController('/dev/ttyUSB0')

try:
    while True:
        try:
            print(tc.get())
            sleep(1)
        except IOError:
            print('disconnected')
except KeyboardInterrupt:
    pass
finally:
    tc.close()