This package is ment to be used to read data from MH_Z19B CO2 Sensor via serial. Sensor can be bought on AliExpress for around 18€ (Jan 2019)
It is recommended to disable Auto calibration and set measuring range to 5000 to get adequate readings after first day of use.
Requirements:
You need a USB to TTL adapter to read data from the sensor. I use Prolific Technology PL2303 adapter plugged into my router. Router runs a python script with this library that reads metrics periodically and sends it via MQTT.
Python 3.5+
Installation:
pip3 install pymh-z19b-serialLibrary Usage examples:
It is possible to use sync and async way to read from the sensor
Sync
Uses pyserial
from mh_z19b.sync import Sensor
sensor = Sensor(port='/dev/cu.usbserial', baudrate=9600)
print(sensor.read_metric())Async
Uses asyncio and pyserial-asyncio
import asyncio
from mh_z19b.async import Sensor
async def run(loop):
sensor = Sensor(loop)
await sensor.open_serial(url='/dev/cu.usbserial', baudrate=9600)
data = await sensor.read_metric()
print(data)
loop = asyncio.get_event_loop()
loop.set_debug(True)
loop.run_until_complete(run(loop))
loop.close()1 maintainer
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