ESPhome: How to set up filters to take exactly 10 measurements and then average it?

ESPHome
1

Hello all. I have been struggling how to combine filters to take 10 measurements and return average.

The problem is that I use low power sensor and I do not want to take more than 10 measurements in order to save chip power. All methods I tried take measurements all time the esphome is awake and then can return average of last 10 (like moving average). I would like the sensor take exactly 10 measurements (0.1s apart), calculate average and then return exactly 1 result and go back to sleep. Is that actually possible?

1 Like
2

It should be possible using these components. Did you try the filter component of the sensors like this.

  filters:
    - sliding_window_moving_average:
        window_size: 10
        send_every: 10
        send_first_at: 10
    - throttle: 10s

Also you might have already put the update interval as 100ms and in deep sleep settings run as 12s

3

Thank you but this seems it is not working. Your script is simply taking measurements all time until deep sleep, so more than 10. The config is here:

sensor:
  platform: adc
  pin: 36
  name: Vcc Average
  update_interval: 100ms
  filters:
    - sliding_window_moving_average:

        window_size: 10
        send_every: 10
        send_first_at: 10
    - throttle: 10s

...

deep_sleep:
  id: deep_sleep_1
  run_duration: 3s #4s
  sleep_duration: 20s #15s # 3806s

and the log output is here:

INFO Starting log output from /dev/ttyUSB0 with baud rate 115200
[10:45:46][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:46][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:46][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:46][I][mqtt:202]: MQTT Connected!
[10:45:46][C][deep_sleep:013]: Setting up Deep Sleep...
[10:45:46][I][app:059]: setup() finished successfully!
[10:45:46][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:46][I][app:105]: ESPHome version 1.16.2 compiled on Apr 10 2021, 10:36:53
[10:45:46][C][wifi:443]: WiFi:
[10:45:46][C][wifi:303]:   SSID: 'IoT'
[10:45:46][C][wifi:304]:   IP Address: 10.0.0.254
[10:45:46][C][wifi:306]:   BSSID: EC:AD:E0:D2:FC:DB
[10:45:46][C][wifi:307]:   Hostname: 'average_test'
[10:45:46][C][wifi:311]:   Signal strength: -28 dB ▂▄▆█
[10:45:46][C][wifi:315]:   Channel: 3
[10:45:46][C][wifi:316]:   Subnet: 255.255.255.0
[10:45:46][C][wifi:317]:   Gateway: 10.0.0.138
[10:45:46][C][wifi:318]:   DNS1: 8.8.8.8
[10:45:47][C][wifi:319]:   DNS2: 8.8.4.4
[10:45:47][C][logger:185]: Logger:
[10:45:47][C][logger:186]:   Level: DEBUG
[10:45:47][C][logger:187]:   Log Baud Rate: 115200
[10:45:47][C][logger:188]:   Hardware UART: UART0
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][C][adc:026]: ADC Sensor 'Vcc Average'
[10:45:47][C][adc:026]:   Unit of Measurement: 'V'
[10:45:47][C][adc:026]:   Accuracy Decimals: 2
[10:45:47][C][adc:026]:   Icon: 'mdi:flash'
[10:45:47][C][adc:035]:   Pin: 36
[10:45:47][C][adc:038]:  Attenuation: 0db (max 1.1V)
[10:45:47][C][adc:051]:   Update Interval: 0.1s
[10:45:47][C][ota:029]: Over-The-Air Updates:
[10:45:47][C][ota:030]:   Address: 10.0.0.254:3232
[10:45:47][C][mqtt:051]: MQTT:
[10:45:47][C][mqtt:053]:   Server Address: 10.0.0.54:1883 (10.0.0.54)
[10:45:47][C][mqtt:054]:   Username: 'janb'
[10:45:47][C][mqtt:055]:   Client ID: 'average_test-10521c6d44e4'
[10:45:47][C][mqtt:057]:   Discovery prefix: 'homeassistant'
[10:45:47][C][mqtt:058]:   Discovery retain: YES
[10:45:47][C][mqtt:060]:   Topic Prefix: 'average_test'
[10:45:47][C][mqtt:062]:   Log Topic: 'average_test/debug'
[10:45:47][C][mqtt:065]:   Availability: 'mqtt_avg_test/status'
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][C][mqtt:551]: MQTT Message Trigger:
[10:45:47][C][mqtt:552]:   Topic: 'mqtt_avg_test/ota_mode'
[10:45:47][C][mqtt:553]:   QoS: 0
[10:45:47][C][mqtt:551]: MQTT Message Trigger:
[10:45:47][C][mqtt:552]:   Topic: 'mqtt_avg_test/sleep_mode'
[10:45:47][C][mqtt:553]:   QoS: 0
[10:45:47][C][mqtt.sensor:024]: MQTT Sensor 'Vcc Average':
[10:45:47][C][mqtt.sensor:028]:   State Topic: 'average_test/sensor/vcc_average/state'
[10:45:47][C][deep_sleep:020]: Setting up Deep Sleep...
[10:45:47][C][deep_sleep:023]:   Sleep Duration: 20000 ms
[10:45:47][C][deep_sleep:026]:   Run Duration: 3000 ms
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:47][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:48][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][D][adc:056]: 'Vcc Average': Got voltage=1.10V
[10:45:49][I][deep_sleep:067]: Beginning Deep Sleep

So it is reading all time. I would prefer to take just 10 readings and then send average.

4

I solved it with this:

globals:
  - id: bc2
    type: long int
    restore_value: yes
    initial_value: "0"
  - id: a_input
    restore_value: no
    type: float
    initial_value: "0.0"
  - id: i
    type: long int
    restore_value: no
    initial_value: "0"

...

  on_loop:
    lambda: |-
      id(i)++;
      if (id(i) <= 10) {
        id(vcc).update();
        float vcc_now = id(vcc).state;
        id(a_input) = id(a_input) + vcc_now/10;
        delay(100);
        }
      if (id(i) == 10) {
        id(vcc_average).update();
        }

....

sensor:
  - platform: adc
    pin: 36
    name: Vcc
    internal: true
    id: vcc
    update_interval: 10s

  - platform: template
    name: Vcc Average
    id: vcc_average
    update_interval: 10s
    lambda:
      if (id(i) > 1) {
        ESP_LOGD("main", "################################## Returns value");
        return id(a_input);
        }
      else {
        ESP_LOGD("main", "################################## Returns NAN");
        return NAN;
        }

working well.

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