Multiple i2c sensors comparision using arduino with some consumer devices included in test results. Using SHT85 and GreenDay as "temporary reference devices".
~24% RH
| Device/sensor | t | RH |
|---|---|---|
| Green Day | 22.1 | 23.1% |
| Xiaomi MHO-C201 | 22.5 | 24% |
| Senserion S.G. | 22.59 | 29.88% |
| Beurer HM16 | 21.6 | LOW |
| TFA Spring | 22.2 | 23% |
| TFA t/RH | 22 | 25% |
| SHT21 (1) | 22.20 | 33.76% |
| SHT21 (1) | 22.33 | 35.37% |
| HTU21D (1) | 22.32 | 22.21% |
| HTU21D (1) | 22.72 | 21.66% |
| HTU21D (2) | 22.55 | 21.47% |
| SHT20 | 22.60 | 24.80% |
| SHT21 (2) | 22.79 | 23.80% |
| SHT25 | 22.71 | 24.91% |
| SHT30 | 22.09 | 26.83% |
| SHT30 | 22.12 | 27.23% |
| SHT31 | 22.08 | 28.11% |
| SHT31 | 22.19 | 28.05% |
| SHT35 | 22.29 | 25.49% |
| SHT35 | 22.41 | 25.14% |
| SHT31 (2) | 22.54 | 28.74% |
| SHT85 | 22.48 | 24.10% |
| BME680 | 22.62 | 25.45% |
| BME680 | 23.03 | 24.73% |
| BME280 | 23.04 | 21.99% |
| BME280 | 22.88 | 22.31% |
| BME280 | 23.22 | 21.44% |
| BME680 (2) | 24.30 | 20.18% |
| BME680 (2) | 24.41 | 21.03% |
| DHT12 | 22.00 | 14.10% |
| DHT12 | 22.00 | 31.80% |
~29% RH
| Device/sensor | t | RH |
|---|---|---|
| Green Day | 22.1 | 29.4% |
| Xiaomi MHO-C201 | 22.1 | 31% |
| Senserion S.G. | 22.14 | 35.58% |
| Beurer HM16 | 21.6 | LOW |
| TFA Spring | 22.2 | 28% |
| TFA t/RH | 22 | 28% |
| SHT21 (1) | 22.13 | 37.56% |
| SHT21 (1) | 22.21 | 38.98% |
| HTU21D (1) | 22.10 | 28.39% |
| HTU21D (1) | 22.39 | 28.08% |
| HTU21D (2) | 22.22 | 28.14% |
| SHT20 | 22.28 | 31.06% |
| SHT21 (2) | 22.17 | 30.45% |
| SHT25 | 22.33 | 31.17% |
| SHT30 | 22.02 | 32.54% |
| SHT30 | 22.09 | 33.10% |
| SHT31 | 21.99 | 34.06% |
| SHT31 | 21.99 | 34.11% |
| SHT35 | 22.04 | 31.87% |
| SHT35 | 22.14 | 31.53% |
| SHT31 (2) | 22.09 | 35.21% |
| SHT85 | 22.00 | 30.05% |
| BME680 | 22.55 | 31.35% |
| BME680 | 22.88 | 30.60% |
| BME280 | 22.90 | 27.56% |
| BME280 | 22.67 | 27.99% |
| BME280 | 22.94 | 27.10% |
| BME680 (2) | 23.74 | 25.61% |
| BME680 (2) | 24.05 | 25.82% |
| DHT12 | 22.10 | 22.40% |
| DHT12 | 21.90 | 34.50% |
~42% RH
| Device/sensor | t | RH |
|---|---|---|
| Green Day | 22.3 | 42.4% |
| Xiaomi MHO-C201 | 22.5 | 41% |
| Senserion S.G. | 22.66 | 46.24% |
| Beurer HM16 | 21.8 | 30% |
| TFA Spring | 22.3 | 38% |
| TFA t/RH | 22 | 34% |
| SHT21 (1) | 22.39 | 46.57% |
| SHT21 (1) | 22.46 | 47.14% |
| HTU21D (1) | 22.38 | 42.10% |
| HTU21D (1) | 22.75 | 41.62% |
| HTU21D (2) | 22.49 | 41.64% |
| SHT20 | 22.58 | 43.45% |
| SHT21 (2) | 22.64 | 42.40% |
| SHT25 | 22.72 | 42.95% |
| SHT30 | 22.51 | 44.97% |
| SHT30 | 22.53 | 45.42% |
| SHT31 | 22.40 | 46.15% |
| SHT31 | 22.47 | 46.14% |
| SHT35 | 22.55 | 44.30% |
| SHT35 | 22.61 | 44.02% |
| SHT31 (2) | 22.63 | 47.17% |
| SHT85 | 22.74 | 41.88% |
| BME680 | 22.64 | 44.04% |
| BME680 | 22.93 | 42.72% |
| BME280 | 23.08 | 40.17% |
| BME280 | 22.85 | 40.79% |
| BME280 | 23.11 | 39.61% |
| BME680 (2) | 24.37 | 34.78% |
| BME680 (2) | 23.80 | 36.54% |
| DHT12 | 22.30 | 36.50% |
| DHT12 | 21.90 | 43.00% |
Draft Results:
Looks like BME680 (2) module got some minor internal heating that makes t measurement higher and RH measurements lower. Will probably try to place it with sensor at the bottom next time (with updated test setup). DHT12 is (as expected) not good at low humidity. Have no explanation of why GY-213V-SHT21 is that inacurate. Surprized with relatively cheap HTU21 (that is compatible to SHT2x and may be replaced without firmware change) perform so good.
TODO in next setup:
- Add more multiplexor to be able to include hdc1080 and Si7021,
- Power one of multiplexers by 5v to add DHT22 to test.
- Add more columns to the screen
- (optional) SD data logging and (very optional)
