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Fix NTC calculation for ESP32

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Fix NTC calculation for ESP32 (#10906)
This commit is contained in:
Theo Arends 2021-02-10 15:56:06 +01:00
parent 55ba994956
commit 7c9067b7b1
1 changed files with 4 additions and 4 deletions
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8
tasmota/xsns_02_analog.ino
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@ -42,7 +42,7 @@
#define TO_KELVIN(x) ((x) + 273.15)
// Parameters for equation
#define ANALOG_V33 3.3 // ESP8266 Analog voltage
#define ANALOG_V33 3.3 // ESP8266 / ESP32 Analog voltage
#define ANALOG_T0 TO_KELVIN(25.0) // 25 degrees Celcius in Kelvin (= 298.15)
// Shelly 2.5 NTC Thermistor
@ -410,9 +410,9 @@ void AdcEverySecond(void) {
if (ADC_TEMP == Adc[idx].type) {
int adc = AdcRead(Adc[idx].pin, 2);
// Steinhart-Hart equation for thermistor as temperature sensor
double Rt = (adc * Adc[idx].param1) / (1024.0 * ANALOG_V33 - (double)adc);
double BC = (double)Adc[idx].param3 / 10000;
double T = BC / (BC / ANALOG_T0 + TaylorLog(Rt / (double)Adc[idx].param2));
double Rt = (adc * Adc[idx].param1) / (ANALOG_RANGE * ANALOG_V33 - (double)adc); // Shelly param1 = 32000 (ANALOG_NTC_BRIDGE_RESISTANCE)
double BC = (double)Adc[idx].param3 / 10000; // Shelly param3 = 3350 (ANALOG_NTC_B_COEFFICIENT)
double T = BC / (BC / ANALOG_T0 + TaylorLog(Rt / (double)Adc[idx].param2)); // Shelly param2 = 10000 (ANALOG_NTC_RESISTANCE)
Adc[idx].temperature = ConvertTemp(TO_CELSIUS(T));
}
else if (ADC_CT_POWER == Adc[idx].type) {