Consistency...
I now have many temperature sensors around the house... and it is important that they are comparable. So here I outline the steps I have taken to ensure that the sensors yield comparable data.
While I have attempted to cross calibrate my temperature readings I have not yet attempted to cross calibrate my humidity readings (which I really should do, and I will do when time allows).
Calibration 1: On the 21st of September I put all the sensors I had on the kitchen bench and used the calibration options within the various software packages to adjust all the sensors to a single value which seemed to be the central tendency of all the sensors. Calibration 2: Last night I did the same thing, but with some new sensors and I did not bring in the sensors from outside.
* these 4 sensors are a lower precision sensor than the others.
Why more sensors?
The HRV (heat recovery ventilation) system has a little app that lets me look at the temperature of the incoming / outgoing air - but I cannot record / save those data as the company does not allow it. The easy solution is to put some sensors in key places.
I struggled to get the water wall temperature sensors doing what I wanted, and after several tries I managed to get the wirelessTag outside tag system - which takes thermocouple input - to work. I took the electronics out of the water proof casing as they are inside, but it means that I can measure the water temperature... and means I have one less electronics system to manage.
What it looks like:
While I have attempted to cross calibrate my temperature readings I have not yet attempted to cross calibrate my humidity readings (which I really should do, and I will do when time allows).
Calibration 1: On the 21st of September I put all the sensors I had on the kitchen bench and used the calibration options within the various software packages to adjust all the sensors to a single value which seemed to be the central tendency of all the sensors. Calibration 2: Last night I did the same thing, but with some new sensors and I did not bring in the sensors from outside.
November 1 calibration
| Sensor | Calibrated (°C) | Raw reading (°C) | δ °C |
|---|---|---|---|
| Clerestory | 23.60 | 24.09 | -0.49 |
| Mufraj (NE) | 24.60 | 25.33 | -0.73 |
| Bedroom Southeast | 24.60 | 24.87 | -0.27 |
| Bedroom Northwest | 24.70 | 24.98 | -0.28 |
| Bathroom Exhaust Up | 24.70 | 25.20 | -0.50 |
| Bathroom Exhaust Down | 24.70 | 24.85 | -0.15 |
| Laundry Exhaust | 24.70 | 25.42 | -0.72 |
| HRV intake | 24.70 | 25.69 | -0.99 |
| HRV outlet | 24.70 | 25.03 | -0.33 |
| WaterWall East | 24.60 | 24.49 | +0.11 |
| WaterWall West | 24.60 | 24.72 | -0.12 |
| WaterWall Air | 24.70 | 25.13 | -0.43 |
September 21 calibration
| Sensor | Calibrated (°C) | Raw reading (°C) | δ °C |
|---|---|---|---|
| Outdoor | 23.70 | 23.87 | -0.17 |
| CubbyHouse | 23.70 | 23.84 | -0.14 |
| Kitchen | 23.70 | 24.23 | -0.53 |
| Mufraj | 23.70 | 24.35 | -0.65 |
| Bedroom North Centre | 23.70 | 24.24 | -0.54 |
| *Door Laundry | 22.30 | 19.86 | +2.56 |
| *Door Main | 22.30 | 19.86 | +2.56 |
| *Study | 23.70 | 21.41 | +2.29 |
| *Master | 22.30 | 20.19 | +2.11 |
Why more sensors?
The HRV (heat recovery ventilation) system has a little app that lets me look at the temperature of the incoming / outgoing air - but I cannot record / save those data as the company does not allow it. The easy solution is to put some sensors in key places.
I struggled to get the water wall temperature sensors doing what I wanted, and after several tries I managed to get the wirelessTag outside tag system - which takes thermocouple input - to work. I took the electronics out of the water proof casing as they are inside, but it means that I can measure the water temperature... and means I have one less electronics system to manage.
What it looks like:
