Switch to SGP41 air quality sensor
My testing with the SGP30 sensor proved fruitless, as various sensors would mis-report (under- and over-) levels and generally not be consistent with each other or reality. These sensors are simply too flaky with zero consistency. Instead, switch to the SGP41, which so far seems more robust and is used in other tools like the AirGradient One. We leverage their calculations for VOC Index -> VOC levels, as well as a generalized isobutylene-based eCO2 calculation.
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179
supersensor.yaml
179
supersensor.yaml
@ -546,38 +546,65 @@ sensor:
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cpu_frequency:
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name: "CPU Frequency"
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- platform: sgp30
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eco2:
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name: "SGP30 eCO2"
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id: sgp30_eco2
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accuracy_decimals: 1
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icon: mdi:molecule-co2
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- platform: sgp4x
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voc:
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name: "SGP41 VOC Index"
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id: sgp41_voc_index
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accuracy_decimals: 0
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icon: mdi:waves-arrow-up
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filters:
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- sliding_window_moving_average: # We take a reading every 15 seconds, but calculate the sliding
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window_size: 12 # average over 12 readings i.e. 60 seconds/1 minute to normalize
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send_every: 3 # brief spikes while still sending a value every 15 seconds.
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nox:
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name: "SGP41 NOx Index"
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id: sgp41_nox_index
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accuracy_decimals: 0
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icon: mdi:waves-arrow-up
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filters:
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- sliding_window_moving_average:
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window_size: 20
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send_every: 1
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tvoc:
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name: "SGP30 TVOC"
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id: sgp30_tvoc
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accuracy_decimals: 1
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icon: mdi:molecule
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filters:
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- sliding_window_moving_average:
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window_size: 20
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send_every: 1
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eco2_baseline:
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name: "SGP30 Baseline eCO2"
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id: sgp30_baseline_ec02
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icon: mdi:molecule-co2
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tvoc_baseline:
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name: "SGP30 Baseline TVOC"
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id: sgp30_baseline_tvoc
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icon: mdi:molecule
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window_size: 12
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send_every: 3
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compensation:
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temperature_source: sht45_temperature
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humidity_source: sht45_humidity
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store_baseline: yes
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update_interval: 15s
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store_baseline: true
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update_interval: 5s
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- platform: template
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name: "SGP41 TVOC (µg/m³)"
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id: sgp41_tvoc_ugm3
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icon: mdi:molecule
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lambda: |-
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float i = id(sgp41_voc_index).state;
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if (i < 1) return NAN;
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float tvoc = (log(501.0 - i) - 6.24) * -878.53;
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return tvoc;
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unit_of_measurement: "µg/m³"
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accuracy_decimals: 0
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- platform: template
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name: "SGP41 TVOC (ppb)"
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id: sgp41_tvoc_ppb
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icon: mdi:molecule
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lambda: |-
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float tvoc_ugm3 = id(sgp41_tvoc_ugm3).state;
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float tvoc_ppm = tvoc_ugm3 * 0.436; // ppb estimated using isobutylene MW (56.1 g/mol)
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return tvoc_ppm;
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unit_of_measurement: "ppb"
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accuracy_decimals: 0
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- platform: template
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name: "SGP41 eCO2 (appr.)"
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id: sgp41_eco2_appr
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icon: mdi:molecule-co2
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lambda: |-
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float tvoc_ppb = id(sgp41_tvoc_ppb).state;
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float eco2_ppm = 400.0 + 1.5 * tvoc_ppb;
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if (eco2_ppm > 2000) eco2_ppm = 2000;
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return eco2_ppm;
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unit_of_measurement: "ppm"
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accuracy_decimals: 0
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- platform: sht4x
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temperature:
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@ -622,51 +649,6 @@ sensor:
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return (b * alpha) / (a - alpha);
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update_interval: 15s
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# IAQ Index (1-5, 5=Great))
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- platform: template
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name: "IAQ Index"
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icon: mdi:air-purifier
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id: iaq_index
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lambda: |-
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int tvoc = id(sgp30_tvoc).state;
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int eco2 = id(sgp30_eco2).state;
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if (tvoc > 2200 || eco2 > 2000) return 1; // Bad
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if (tvoc > 660 || eco2 > 1200) return 2; // Poor
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if (tvoc > 220 || eco2 > 800) return 3; // Fair
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if (tvoc > 65 || eco2 > 500) return 4; // Good
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return 5; // Great
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update_interval: 15s
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# Room Health Score (1-4, 4=Optimal)
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- platform: template
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name: "Room Health Score"
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icon: mdi:home-thermometer
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id: room_health
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lambda: |-
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float temp = id(sht45_temperature).state;
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float rh = id(sht45_humidity).state;
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int iaq = id(iaq_index).state;
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bool temp_ok = (temp >= 18 && temp <= 24);
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bool hum_ok = (rh >= 30 && rh <= 70);
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bool iaq_ok = (iaq >= 4);
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int conditions_met = 0;
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if (temp_ok) conditions_met++;
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if (hum_ok) conditions_met++;
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if (iaq_ok) conditions_met++;
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if (iaq_ok && temp_ok && hum_ok) {
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return 4; // Optimal: All conditions met and IAQ is excellent/good
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} else if (iaq >= 3 && conditions_met >= 2) {
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return 3; // Fair: IAQ is moderate and at least 2 conditions met
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} else if (iaq >= 2 && conditions_met >= 1) {
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return 2; // Poor: IAQ is poor and at least 1 condition met
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} else {
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return 1; // Bad: All conditions failed or IAQ is unhealthy
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}
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update_interval: 15s
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- platform: tsl2591
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address: 0x29
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update_interval: 1s
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@ -795,59 +777,6 @@ text_sensor:
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mac_address:
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name: "LD2410C MAC Address"
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# VOC Level
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- platform: template
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name: "VOC Level"
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icon: mdi:molecule
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lambda: |-
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int tvoc = id(sgp30_tvoc).state;
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if (tvoc < 65) return {"Great"};
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if (tvoc < 220) return {"Good"};
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if (tvoc < 660) return {"Fair"};
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if (tvoc < 2200) return {"Poor"};
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return {"Bad"};
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update_interval: 15s
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# CO2 Level
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- platform: template
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name: "CO2 Level"
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icon: mdi:molecule-co2
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lambda: |-
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int eco2 = id(sgp30_eco2).state;
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if (eco2 < 500) return {"Great"};
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if (eco2 < 800) return {"Good"};
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if (eco2 < 1200) return {"Fair"};
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if (eco2 < 2000) return {"Poor"};
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return {"Bad"};
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update_interval: 15s
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# IAQ Classification
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- platform: template
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name: "IAQ Classification"
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icon: mdi:air-purifier
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lambda: |-
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int iaq = id(iaq_index).state;
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if (iaq == 5) return {"Great"};
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if (iaq == 4) return {"Good"};
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if (iaq == 3) return {"Fair"};
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if (iaq == 2) return {"Poor"};
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return {"Bad"};
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update_interval: 15s
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# Room Health
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- platform: template
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name: "Room Health"
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icon: mdi:home-thermometer
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lambda: |-
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int score = id(room_health).state;
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if (score == 4) return {"Optimal"};
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if (score == 3) return {"Fair"};
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if (score == 2) return {"Poor"};
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return {"Bad"};
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update_interval: 15s
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button:
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- platform: ld2410
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restart:
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name: "LD2410C Restart"
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icon: mdi:power-cycle
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