📟 NEXNTC Library

A flexible and accurate library for reading NTC thermistor temperatures using an analog input on microcontrollers (ArduinoUno, ArduinoMega, ESP32, etc). Supports Steinhart-Hart equation, min/max tracking, oversampling, and moving average filtering.

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✅ Features

• Beta formula and Steinhart-Hart support
• Min/Max temperature tracking (C, F, K)
• Oversampling for better resolution
• Configurable moving average filter
• Async temperature update with loop()
• Open/Short circuit detection

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🔧 Constructor

NTCThermistor thermistor(
  uint8_t analogPin,
  float seriesResistor,
  float nominalResistance,
  float nominalTempC,
  float betaCoefficient,
  int numSamples = 5,
  float vRef = 3.3,  // based on the board type
  uint8_t adcResolution = 12 // based on the board type
);

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📦 Example Usage

#include "NEXNTC.h"

NTCThermistor thermistor(
  A0,        // Analog pin
  10000.0,   // Series resistor (Ohms)
  10000.0,   // Thermistor nominal resistance at 25°C
  25.0,      // Nominal temperature (°C)
  3950.0     // Beta coefficient
);

void setup() {
  Serial.begin(9600);
  if (!thermistor.begin()) {
    Serial.println("Thermistor init failed!");
    while (1);
  }

  thermistor.setADCFiltering(true, 10);     // Enable moving average filter
  thermistor.setADCOversampling(2);         // Optional: enable oversampling
  thermistor.setAsyncInterval(500);         // Update every 500ms
}

void loop() {
  if (thermistor.loop()) {  // Non-blocking update
    Serial.print("Temp (C): ");
    Serial.println(thermistor.readTemperatureC());

    Serial.print("Temp (F): ");
    Serial.println(thermistor.readTemperatureF());

    Serial.print("Min (C): ");
    Serial.println(thermistor.getMinTempC());

    Serial.print("Max (C): ");
    Serial.println(thermistor.getMaxTempC());
  }
}

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⚙️ Optional Features

Enable Steinhart-Hart Coefficients

thermistor.setSteinhartHartCoefficients(0.001129148, 0.000234125, 0.0000000876741);

Reset Min/Max

thermistor.resetMinMax();

Voltage Reference

thermistor.setVoltageReference(3.3);

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📖 API Summary

Method	Description
begin()	Initialize thermistor
readTemperatureC/F/K()	Read temperature in °C/°F/K
getMinTempC()	Get minimum recorded temperature
getMaxTempC()	Get maximum recorded temperature
setADCFiltering(bool, windowSize)	Enable/disable moving average filter
setADCOversampling(bits)	Enable ADC oversampling (0-4 bits)
loop()	Call periodically for async updates
checkOpenCircuit()	Detect open thermistor
checkShortCircuit()	Detect shorted thermistor

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🔋 Requirements

• Arduino-compatible MCU (AVR, ESP32, STM32, etc)
• Compatible NTC thermistor
• Pull-up resistor (e.g., 10k)