ELEC 2 LAB 3

#include <Arduino.h>
#include "esp_sleep.h"

const int analog_pin = 34;      // ADC1_CH6 (GPIO34)
const int led_pin    = 2;       // on-board LED

// #define sweep_mode
// #define deep_sweep_mode

void setup() {
  pinMode(led_pin, OUTPUT);
  analogSetAttenuation(ADC_11db);         // ensure 0–3.3 V range
  analogReadResolution(12);               // 12-bit (0–4095)
  Serial.begin(115200);
}

void loop() {
  int raw = analogRead(analog_pin);       // 0–4095
  float volts = raw * (3.3f / 4095.0f);    // map to 0–3.3 V
  Serial.print("  V: "); Serial.println(volts, 3);

  digitalWrite(led_pin, !digitalRead(led_pin)); // blink LED

  #ifdef sweep_mode
    esp_sleep_enable_timer_wakeup(1'000'000);
    esp_light_sleep_start();
  #elif defined(deep_sweep_mode)
    esp_sleep_enable_timer_wakeup(2'000'000);
    esp_deep_sleep_start();
  #else
    delay(1000);
  #endif
}