Ignoring sensor values during warm up after periodic wake up

ESPHome
1

ESPHome is incredibly well thought out and written. Thank you for making this and sharing!

I’m using the PMS7003 sensor by reading it for 1 minute every 15 minutes, and making it sleep for 14mins. Doing this to minimize power as well as preserve the sensor life:

I’m using code like this to implement the sleep-wake-measure-sleep:

The problem is, the sensor needs to warm up for 30sec after it is up. Values for that time period should be ignored. So the cycle needs to look like:

00:00 sleep PMS7003 via set pin
14:00 wake up via set pin; ignore values for the next 30sec*
14:30 start taking measurements, once every two seconds
15:00 sleep PMS7003 via set pin

How can I implement the 30-second warm up period in ESPHome? Thank you.

1 Like
2

Stable data should be got at least 30 seconds after the sensor wakeup from the sleep mode because of the fan’s performance.

3

I tried this idea: to create an interval to handle turning on the sensor, which also sets a (software) switch indicating warm_up is complete. I then attempted to filter the sensor itself on this warm_up switch. That filter unfortunately doesn’t allow anything through at all:

# turn on for 1min every 15min, and flip a switch after a 30sec warm up period
interval:
  - interval: 15min
    then:
      - switch.turn_on: pms_set
      - delay: 30s
      - switch.turn_on: pms_ready_to_read
      - delay: 45s
      - switch.turn_off: pms_ready_to_read
      - switch.turn_off: pms_set

switch:
  - platform: template
    name: "PMSX003 Ready to Read Post Warm-Up"
    id: pms_ready_to_read

sensor:
  - platform: uptime
    name: ${device_full_name} Uptime
    update_interval: 1s
    id: uptime_sensor
    filters:
      - lambda: if (id(pms_ready_to_read).state) { return(x); } else { return {}; };
    on_value:
      then:
        - lambda: |-
            ESP_LOGD("main", "Uptime sensor value is: %d", int(x));

Would this idea work at all? Can anyone help me see if what I’m doing wrong here? Thank you!

4

Bumping you see if anyone has ideas. Thank you.

5

One more bump

6

What if you made the sensor internal and then used and interval to keep track of time since wake up to then force an update to a template sensor which is then published out to HA or wherever? Just spitballing idea, not sure if it would work for you but perhaps worth investigating if you haven’t already.

-J

7

@iotisunderrated Thank you very much for sharing your config and the hint. I just implemented today the new PMS7003 sensor in EspHome and I took a more simple approach by switching on the measurement for a minute every 14 minutes with the time platform.

time:
  - platform: homeassistant
    on_time:
      - seconds: 0
        minutes: /14
        then:
          - switch.turn_on: pms_set
          - delay: 60s
          - switch.turn_off: pms_set

I don’t really care about the accuracy of the readings since HA just shows the last measured readings in my graph and that’s what it looks like in my card:

      - type: 'custom:mini-graph-card'
        entities:
          - sensor.feinstaub_2_5um_konzentration
        name: 'Feinstaub PM2,5'
        hours_to_show: 36
        points_per_hour: 1
        show:
          labels: true
        color_thresholds:
          - value: 15
            color: '#21ED28'
          - value: 25
            color: '#d36600'
          - value: 80
            color: '#d30003'

Nevertheless, if you have any approach to read only the “accurate” / warmed up values, I would be interested. Please share if you already solved it.

8

Bump! Did someone ever figure out a solution for this problem? I’m trying to do the exact same thing.

9

Just made my solution to ignore PMS7003 values during warm up. Based on iotisunderrated idea.

sensor:
  - platform: pmsx003
    type: PMSX003
    pm_1_0:
      name: "Particulate Matter <1.0µm Concentration"
      filters:
        - lambda: if (id(pms_ready_to_read).state) { return(x); } else { return {}; };
    pm_2_5:
      name: "Particulate Matter <2.5µm Concentration"
      filters:
        - lambda: if (id(pms_ready_to_read).state) { return(x); } else { return {}; };
    pm_10_0:
      name: "Particulate Matter <10.0µm Concentration"
      filters:
        - lambda: if (id(pms_ready_to_read).state) { return(x); } else { return {}; };

interval:
  - interval: 5min
    then:
      - switch.turn_on: pms_set
      - delay: 30s
      - switch.turn_on: pms_ready_to_read
      - delay: 5s
      - switch.turn_off: pms_ready_to_read
      - switch.turn_off: pms_set

switch:
  - platform: template
    name: "PMSX003 Ready to Read Post Warm-Up"
    id: pms_ready_to_read
    optimistic: true
    
  - platform: gpio
    pin: 
      number: GPIO10
    id: pms_set

Works fine for now. Delay time 5s can be reduced to 1-2 seconds. Full my ESPHome config (using 3 sensors: BME280, MH-Z19B and PMS7003) here: https://pastebin.com/saC98GrX

1 Like