dfederschmidt / airsensor-py

Python package for getting sensor values from an Ambient Air Sensor

airsensor-py's Issues

second get fails

dont know if this still active,

but calling

airsensor.get_voc()

leads to timeout and error (first call is just fine, and c version also works correctly):

Traceback (most recent call last):
  File "airsens.py", line 28, in <module>
    voc = airsensor.get_voc()
  File "/home/lucian/miniconda3/lib/python3.8/site-packages/airsensor/core.py", line 23, in get_voc
    n = self.dev.write(0x02, cmd, timeout=10000)
  File "/home/lucian/miniconda3/lib/python3.8/site-packages/usb/core.py", line 989, in write
    return fn(
  File "/home/lucian/miniconda3/lib/python3.8/site-packages/usb/backend/libusb1.py", line 855, in intr_write
    return self.__write(self.lib.libusb_interrupt_transfer,
  File "/home/lucian/miniconda3/lib/python3.8/site-packages/usb/backend/libusb1.py", line 938, in __write
    _check(retval)
  File "/home/lucian/miniconda3/lib/python3.8/site-packages/usb/backend/libusb1.py", line 602, in _check
    raise USBTimeoutError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBTimeoutError: [Errno 110] Operation timed out

Improve documentation

Would be cool to have a picture of such a sensor in there as well as some concise background information how it works and what is measured to determine the VOC score.

Build a real CLI

At the moment, when called, it just outputs the current VOC value. It would be nice to have some options regarding output format for various things:

• add timestamp to output
• output in JSON format