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Diffstat (limited to 'watch-library/watch/watch_utility.h')
| -rw-r--r-- | watch-library/watch/watch_utility.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/watch-library/watch/watch_utility.h b/watch-library/watch/watch_utility.h index e8808923..aada783f 100644 --- a/watch-library/watch/watch_utility.h +++ b/watch-library/watch/watch_utility.h @@ -38,4 +38,20 @@ */ const char * watch_utility_get_weekday(watch_date_time date_time); +/** @brief Returns a temperature in degrees Celsius for a given thermistor voltage divider circuit. + * @param value The raw analog reading from the thermistor pin (0-65535) + * @param highside True if the thermistor is connected to VCC and the series resistor is connected + * to GND; false if the thermistor is connected to GND and the series resistor is + * connected to VCC. + * @param b_coefficient From your thermistor's data sheet, the B25/85 coefficient. A typical value + * will be between 2000 and 5000. + * @param nominal_temperature From your thermistor's data sheet, the temperature (in Celsius) at + * which the thermistor's resistance is at its nominal value. + * @param nominal_resistance The thermistor's resistance at the nominal temperature. + * @param series_resistance The value of the other resistor in the voltage divider. + * @note Ported from Adafruit's MIT-licensed CircuitPython thermistor code, (c) 2017 Scott Shawcroft: + * https://github.com/adafruit/Adafruit_CircuitPython_Thermistor/blob/main/adafruit_thermistor.py + */ +float watch_utility_thermistor_temperature(uint16_t value, bool highside, float b_coefficient, float nominal_temperature, float nominal_resistance, float series_resistance); + #endif |