/* * Lab 1 - Task 7: Analog Sensor (LM35)
 * Objective: Read temperature using mathematical ADC conversion.
 */

const int lm35Pin = 35;    // LM35 VOUT connected to GPIO 35 (Analog Input)

void setup() {
  Serial.begin(115200);
  Serial.println("Task 7 Ready: LM35 Analog Temperature Test!");
}

void loop() {
  // 1. Read the raw 12-bit ADC value (0 to 4095)
  int adcValue = analogRead(lm35Pin);

  // 2. Convert the ADC value to Voltage in millivolts (mV)
  // ESP32 operates at 3.3V, which is 3300mV.
  float voltage_mV = (adcValue / 4095.0) * 3300.0;

  // 3. Convert the voltage to Temperature in Celsius
  // The LM35 outputs 10mV per degree Celsius.
  float temperature = voltage_mV / 10.0;

  // 4. Display the results
  Serial.print("Raw ADC: ");
  Serial.print(adcValue);
  Serial.print(" \tVoltage: ");
  Serial.print(voltage_mV);
  Serial.print(" mV \tTemperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Wait 1 second before the next reading
  delay(1000);
}