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Integrate the Co2 readings from a Techno Line WL 1030 into ESPhome / Home Assistant

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ESPhome_technoline_wl1030_co2

Integrate the Co2 readings from a Techno Line WL 1030 into ESPhome / Home Assistant

The Co2 sensor used by the Technoline WL 1030 seems to be a Cubic NDIR CO2 Sensor Module CM1106-C. This sensor has a PWM output, that can be used by an ESP to measure the Co2 readings.

This solution does not read any other values than the Co2!

Adding an ESP to the Techno Line

  • Open the Techno Line (There is a hidden screw under the stand)
  • Connect VIN from the Co2 to ESP VIN/BAT/5V
  • Connect GND from the Co2 to ESP GND
  • Connect PWM from the Co2 to ESP input pin (I used GPIO14)
  • Solder a Pull-Up of 5k-10k between VIN and PWM (I'm not 100% sure that this is needed, but the datasheet mentions that you need it while using an oscilloscope)

Esp Home configuration

...
    
sensor:
  - platform: pulse_width
    pin: GPIO14
    name: Co2
    update_interval: 30s
    filters: 
      - lambda: return (x-0.002) * 5000;

    unit_of_measurement: "ppm"
    icon: "mdi:molecule-co2"
    device_class: "carbon_dioxide"
    state_class: "measurement"
    accuracy_decimals: 0

Example output, taken from ESP home in Home Assistant

[13:57:06][D][sensor:093]: 'Co2': Sending state 793.76996 ppm with 0 decimals of accuracy
[13:57:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.172 s
[13:57:36][D][sensor:093]: 'Co2': Sending state 849.76495 ppm with 0 decimals of accuracy
[13:58:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.179 s
[13:58:06][D][sensor:093]: 'Co2': Sending state 882.71002 ppm with 0 decimals of accuracy
[13:58:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.165 s
[13:58:36][D][sensor:093]: 'Co2': Sending state 812.76001 ppm with 0 decimals of accuracy
[13:59:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.155 s
[13:59:06][D][sensor:093]: 'Co2': Sending state 762.74500 ppm with 0 decimals of accuracy
[13:59:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.155 s
[13:59:36][D][sensor:093]: 'Co2': Sending state 763.74506 ppm with 0 decimals of accuracy
[14:00:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.168 s
[14:00:06][D][sensor:093]: 'Co2': Sending state 828.73004 ppm with 0 decimals of accuracy
[14:00:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.168 s
[14:00:36][D][sensor:093]: 'Co2': Sending state 831.88501 ppm with 0 decimals of accuracy
[14:01:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.155 s
[14:01:06][D][sensor:093]: 'Co2': Sending state 764.94000 ppm with 0 decimals of accuracy
[14:01:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.145 s
[14:01:36][D][sensor:093]: 'Co2': Sending state 716.89502 ppm with 0 decimals of accuracy
[14:02:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.141 s
[14:02:06][D][sensor:093]: 'Co2': Sending state 692.81995 ppm with 0 decimals of accuracy
[14:02:36][C][pulse_width:026]: 'Co2' - Got pulse width 0.143 s
[14:02:36][D][sensor:093]: 'Co2': Sending state 705.92505 ppm with 0 decimals of accuracy
[14:03:06][C][pulse_width:026]: 'Co2' - Got pulse width 0.141 s
[14:03:06][D][sensor:093]: 'Co2': Sending state 695.86005 ppm with 0 decimals of accuracy

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