numato-gpio 0.2.0

Python API for Numato GPIO Expanders

Python API for Numato GPIO Expanders

This Python API can be used to control Numato 32 Port USB GPIO expanders.

• Configure ports as input or output port
• Write to output ports
• Read from input ports
• Read integer values from ADC input ports (1 - 7)
• Register a callback for input port events (edge detection)

Usage

Install latest development version:

pip install --user git+https://github.com/clssn/numato-gpio.git

Install latest release:

pip install --user numato-gpio

Once installed, the API can be used like:

import numato_gpio as gpio

my_device_id = 0
gpio.discover()
dev = gpio.devices[my_device_id]

# configure port 4 as output and set it to high
dev.setup(4, gpio.OUT)
dev.write(4, 1)

# configure port 27 as input and print its logic level
dev.setup(27, gpio.IN)
print(dev.read(27))

# configure port 2 as input and print its ADC value
dev.setup(2, gpio.IN)
print(dev.adc_read(2))

# configure port 14 as input and setup notification on logic level changes
dev.setup(14, gpio.IN)
def callback(port, level):
    print("{edge:7s} edge detected on port {port} "
        "-> new logic level is {level}".format(
        edge="Rising" if level else "Falling",
        port=port,
        level="high" if level else "low")
    )

dev.add_event_detect(14, callback, gpio.BOTH)
dev.notify(True)

Known Issues

Though the code works well in a Home Assistant integration since 2018, there are quite some aspects to improve. The following issues are only the ones the author is aware of:

• No unit tests
• Some docstrings are hard to understand
• Device discovery/registry as module-global dict is sub-optimal
• Only /dev/ACMx devices are scanned which were mapped on the author's Linux