On Saturday, November 24, 2018 at 12:11:39 PM UTC-5, KattanaD wrote:
>
> Installed weewx 3.8.2 using the script on my raspberry pi
> I would like to add a co2 sensor to my weather station.
> im using acurite sensors and rtl_433 currently
>
> I have a Cozir gc-0017 co2 sensor 20% range
> serial sensor connected to usb to TTL cable
>
create a service that reads data directly from the sensor.
the service would be a file user/cozir.py that looks something like this:
import serial
import syslog
import weewx.engine
class CozirService(weewx.engine.StdService):
def __init__(self, engine, config_dict):
d = config_dict.get('Cozir', {})
port = d.get('port', '/dev/ttyS0')
self.serial_port = serial.Serial(port)
self.serial_port.write("M 4\r\n")
self.serial_port.write("K 2\r\n") # put the device in polling mode
def handle_new_loop(self, event):
self.get_data(event.packet)
def handle_new_archive(self, event):
self.get_data(event.record)
def get_data(self, data):
v = None
try:
x = self.serial_port.write("Z\r\n")
x = self.serial_port.read()
v = float(x[2:8]
data['co2'] = v # value in ppm
except serial.serialutil.SerialException, e:
syslog.syslog(syslog.LOG_ERR, "fail: %s" % e)
add an entry in the weewx configuration to specify the port:
[Cozir]
port = /dev/ttyUSB0
enable the service in your weewx configuration file something like this:
[Engine]
[[Services]]
...
data_services = user.cozir.CozirService
...
then restart weewx
that should get you started :)
m
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