1.3 The temperature probe
The temperature probe that the STC-1000 uses is a 10k NTC thermistor with a β25°C/85°C value of 3435, presumably 1%.
It is connected to an analogue input on the MCU via a voltage divider as shown above.
| Temperature [°C] | Resistance [Ohm] |
|---|---|
| -40.0 | 190953 |
| -35.0 | 145953 |
| -30.0 | 112440 |
| -25.0 | 87285 |
| -20.0 | 68260 |
| -15.0 | 53762 |
| -10.0 | 42636 |
| -5.0 | 34038 |
| 0.0 | 27348 |
| 5.0 | 22108 |
| 10.0 | 17979 |
| 15.0 | 14706 |
| 20.0 | 12094 |
| 25.0 | 10000 |
| 30.0 | 8310.8 |
| 35.0 | 6941.1 |
| 40.0 | 5824.9 |
| 45.0 | 4910.6 |
| 50.0 | 4158.3 |
| 55.0 | 3536.2 |
| 60.0 | 3019.7 |
| 65.0 | 2588.8 |
| 70.0 | 2228.0 |
| 75.0 | 1924.6 |
| 80.0 | 1668.4 |
| 85.0 | 1451.3 |
| 90.0 | 1266.7 |
| 95.0 | 1109.2 |
| 100.0 | 974.26 |
| 105.0 | 858.33 |