esp32_sim7000_mpu6050_sd1306_demo.ino

// Basic OLED demo for accelerometer readings from Adafruit MPU6050

// ESP32 Guide: https://RandomNerdTutorials.com/esp32-mpu-6050-accelerometer-gyroscope-arduino/
// ESP8266 Guide: https://RandomNerdTutorials.com/esp8266-nodemcu-mpu-6050-accelerometer-gyroscope-arduino/
// Arduino Guide: https://RandomNerdTutorials.com/arduino-mpu-6050-accelerometer-gyroscope/

#include <Adafruit_MPU6050.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <driver/adc.h>
#include "esp_adc_cal.h"

#define ADC_EN              14  //ADC_EN is the ADC detection enable port
#define ADC_PIN             34

int vref = 1100;
float battery_voltage = 10;
float usb_voltage = 0;

Adafruit_MPU6050 mpu;
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

void showVoltage()
{
  digitalWrite(14, HIGH);
  delay(1);
  float measurement = (float) analogRead(34);
  battery_voltage = (measurement / 4095.0) * 7.26;
  digitalWrite(14, LOW);
  float usb_measurement = (float) analogRead(14);
  usb_voltage = (usb_measurement / 4095.0) * 7.26;
}

void setup() {
  Serial.begin(115200);
  // while (!Serial);
  Serial.println("MPU6050 OLED demo");

  if (!mpu.begin()) {
    Serial.println("Sensor init failed");
    while (1)
      yield();
  }
  Serial.println("Found a MPU-6050 sensor");

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;)
      ; // Don't proceed, loop forever
  }
  display.display();
  delay(500); // Pause for 2 seconds
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setRotation(0);

  esp_adc_cal_characteristics_t adc_chars;
  esp_adc_cal_value_t val_type = esp_adc_cal_characterize((adc_unit_t)ADC_UNIT_1, (adc_atten_t)ADC_ATTEN_DB_2_5, (adc_bits_width_t)ADC_WIDTH_BIT_12, 1100, &adc_chars);
  pinMode(14, OUTPUT);
}

void loop() {
  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  display.clearDisplay();
  display.setCursor(0, 0);

  showVoltage();
  display.println("Voltage: ");
  display.print(battery_voltage);
  display.print(" Batt. ");
  display.print(usb_voltage);
  display.print(" USB");
  display.println("");

  Serial.print("Accelerometer ");
  Serial.print("X: ");
  Serial.print(a.acceleration.x, 1);
  Serial.print(" m/s^2, ");
  Serial.print("Y: ");
  Serial.print(a.acceleration.y, 1);
  Serial.print(" m/s^2, ");
  Serial.print("Z: ");
  Serial.print(a.acceleration.z, 1);
  Serial.println(" m/s^2");

  display.println("Accel (m/s^2): ");
  display.print(a.acceleration.x, 1);
  display.print(", ");
  display.print(a.acceleration.y, 1);
  display.print(", ");
  display.print(a.acceleration.z, 1);
  display.println("");

  Serial.print("Gyro. ");
  Serial.print("X: ");
  Serial.print(g.gyro.x, 1);
  Serial.print(" rps, ");
  Serial.print("Y: ");
  Serial.print(g.gyro.y, 1);
  Serial.print(" rps, ");
  Serial.print("Z: ");
  Serial.print(g.gyro.z, 1);
  Serial.println(" rps");

  display.println("Gyro (rps): ");
  display.print(g.gyro.x, 1);
  display.print(", ");
  display.print(g.gyro.y, 1);
  display.print(", ");
  display.print(g.gyro.z, 1);
  display.println("");

  display.println("Temp: ");
  display.print(temp.temperature);
  display.print(" C, ");
  display.print((temp.temperature * 9/5) + 32);
  display.print(" F");

  display.display();
  delay(100);
}