https://github.com/scruss/micropython-simple-thermistor
read NTC thermistor temperature wired in a potential divider
https://github.com/scruss/micropython-simple-thermistor
Last synced: 14 days ago
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read NTC thermistor temperature wired in a potential divider
- Host: GitHub
- URL: https://github.com/scruss/micropython-simple-thermistor
- Owner: scruss
- License: mit
- Created: 2024-10-30T00:06:09.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2024-10-30T22:41:20.000Z (about 1 year ago)
- Last Synced: 2025-08-16T04:55:13.448Z (3 months ago)
- Language: Python
- Size: 6.84 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
- awesome-micropython - micropython-simple-thermistor - Read NTC thermistor temperature wired in a potential divider. (Libraries / Sensors)
README
# micropython-simple-thermistor
read NTC thermistor temperature wired in a potential divider
## WILL NOT WORK WITH
* ESP8266 (limited 1 V max ADC)
* W600 (no ADC!)
## WILL NOT IMPLEMENT
* High-side thermistor
* °F conversion
## TODO
* some docs would be nice
* implement:
* Beta calculation from known second temperature and resistance (T₁, R₁): `β(T₀/T₁) = ln(R₁/R₀) / (1/T₁ - 1/T₀)`
* Steinhart-Hart three-term calculation
* platform testing:
* rp2
* EPS32
* STM32/pyboard
* SAMD
* external ADC?
* thermistor type testing
* MF52
* Adafruit [10K Precision Epoxy Thermistor - 3950 NTC](https://www.adafruit.com/product/372)
* 100 kΩ glass bead thermistor (aka 3d printer thermistor)
* Vishay NTCLE100E3
## Sample Code
```python3
# MicroPython, Raspberry Pi Pico
# pylint: disable=E0401
# -*- coding: utf-8 -*-
import machine
import time
from simple_thermistor import Thermistor
# setup for KY-013-alike thermistor on GPIO 26
t = Thermistor(
adc=machine.ADC(
26
), # ADC object with read_u16() method returning 0–65535
beta=3950,
r0=10000, # thermistor nominal resistance of 10 kΩ at 25 °C
t0=Thermistor.fromC(25), # everything is Kelvin internally
resistor=10000, # high side resistor of 10 kΩ
)
while True:
print(
"%6.1f °C / %.1f Ω"
% (Thermistor.toC(t.temperature()), t.resistance())
)
time.sleep(5)
```