main.cpp

// Dr Paul Lunn - Coventry University
// 9/07/2019
// ESP32 LDR Test

#include <Arduino.h>

const int SERIAL_0_SPEED = 115200;

// The setup() function is called once at the beginning of the program
void setup()
{
  Serial.begin(SERIAL_0_SPEED);     // begin serial link
  Serial.println("ESP32 LDR Test"); // print text onto screen via serial link
}

// The loop() function runs over and over again forever
void loop()
{
  int adc_reading = analogRead(36);             // use adc to read current value
  float light_level = (adc_reading / 4096.0) * 100; //convert adc to light level %

  // send results to serial link
  Serial.print("ADC reading = ");
  Serial.print(adc_reading);
  Serial.print(" Light Level = ");
  Serial.print(light_level);
  Serial.println("%\n");

  delay(1000); // wait for a second
}