//push button replace pressure sensor 
const int b = 33; 
 
//thermistor 
const int t = 26;       // Analog pin connected to the NTC thermistor 
const int resistorValue = 10000; // Resistance value of the resistor in ohms 
const float referenceVoltage = 3.3; // Reference voltage for ESP32 in volts 
 
//motion sensor 
const int m = 25; 
 
//led 
const int red = 18; 
const int green = 5; 
 
 
int b_val = 0; 
int m_val = 0; 
 
void setup() { 
  Serial.begin(115200); 
 
  pinMode(b, INPUT); 
  pinMode(t, INPUT); 
  pinMode(m, INPUT); 
  pinMode(red, OUTPUT); 
  pinMode(green, OUTPUT); 
} 
 
void loop() { 
  // Read the analog voltage across the NTC thermistor 
  int sensorValue = analogRead(t); 
 
  // Convert the analog reading to voltage 
  float voltage = sensorValue * (referenceVoltage / 4095.0); 
 
  // Calculate the resistance of the NTC thermistor using the voltage divider formula 
  float thermistorResistance = (resistorValue * voltage) / (referenceVoltage - voltage); 
 
  // Use the Steinhart-Hart equation or a lookup table to convert resistance to temperature 
  float temperature = calculateTemperature(thermistorResistance); 
 
  Serial.print("Temperature: "); 
  Serial.print(temperature, 2);  // Print temperature with 2 decimal places 
  Serial.println(" °C"); 
 
  b_val = digitalRead(b); 
  m_val = digitalRead(m); 
 
  Serial.print("Motion: "); 
  Serial.println(m_val); 
 
  Serial.print("Pressure: "); 
  Serial.println(b_val);   
 
  if(b_val == HIGH && temperature < 20){ 
    digitalWrite(red, HIGH); 
  } 
  else{ 
    digitalWrite(red, LOW); 
  } 
 
  if(b_val == HIGH && m_val == LOW){ 
    digitalWrite(green, HIGH); 
  } 
  else{   
    digitalWrite(green, LOW); 
  } 
 
  // Delay for a moment before taking the next reading 
  delay(1500); 
} 
 
// Function to calculate temperature using the Steinhart-Hart equation 
float calculateTemperature(float resistance) { 
  const float A = 0.001129148; 
  const float B = 0.000234125; 
  const float C = 0.0000000876741; 
 
  // Steinhart-Hart equation 
  float temperatureKelvin = 1.0 / (A + B * log(resistance) + C * pow(log(resistance), 3)); 
  float temperatureCelsius = temperatureKelvin - 273.15; 
 
  return temperatureCelsius; 
}