Draft Hardware overview
code: https://github.com/liutyi/arduino-humidity-sensors-test/blob/master/humidity-sensor-tester-v2.ino
Sensors Map
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
|---|---|---|---|---|---|---|---|---|
| 1 | SHT25* | SHT21 | SHT21 | SHT21 | SHT21 | SHT20 | SHT20 | SHT20 |
| SHT35 | SHT35 | SHT31 | SHT31 | SHT31 | SHT31 | SHT30 | SHT30 | |
| BME680 | BME680 | BME280 | BME280 | BME280 | DHT12 | DHT12 | DHT12 | |
| 2 | HTU21 | Si7021 | Si7021 | Si7021 | Si7021 | Si7021 | Si7021 | Si7021 |
| 3 | HDC1080 | HDC1080 | HDC1080 | HDC1080 | HDC1080 | HDC1080 | HDC1080 | HDC1080 |
| BME680 | BME680 | SHT85 | SHT85 | SHT85 | SHT31 | SHT31 |
* DIY module with SHT25 chip on SHT20 board.
Red - multiplexors, blue i2c bus.
First Test run with one multiplexer
at ~20% RH on "old firmware" with single multiplexer
~20% RH
| Device/sensor | t | RH |
|---|---|---|
| Green Day | 23.6 | 19.6% |
| SHT20 | 23.85 | 22.06% |
| SHT20 | 23.86 | 21.92% |
| SHT20 | 23.80 | 21.55% |
| SHT21 (2) | 23.80 | 21.99% |
| SHT21 (2) | 23.90 | 22.59% |
| SHT21 (1) | 23.89 | 32.81% |
| SHT21 (1) | 23.83 | 30.93% |
| SHT25 | 24.02 | 22.01% |
| SHT30 | 23.93 | 23.54% |
| SHT30 | 23.90 | 23.10% |
| SHT31 | 23.86 | 24.50% |
| SHT31 | 23.82 | 24.49% |
| SHT31 (2) | 23.87 | 26.41% |
| SHT31 (2) | 23.81 | 22.12% |
| SHT35 | 23.85 | 22.17% |
| SHT35 | 23.85 | 22.41% |
| DHT12 | 23.40 | 30.40% |
| BME280 | 24.54 | 18.39% |
| BME280 | 24.28 | 18.71% |
| BME280 | 24.50 | 18.27% |
| BME680 | 24.70 | 21.41% |
| BME680 | 24.95 | 21.01% |
Plot examples using Serial
at ~t23C ~RH22%
Drop ~RH40 to ~RH25
Plot example from SD datafile
