Luis Malavé
Published © LGPL

M5Stack Core2 - External Sensors

Interconnection and implementation of external sensors for later use IoT applications deployments.

IntermediateFull instructions provided10 hours12
M5Stack Core2 - External Sensors

Things used in this project

Hardware components

Adafruit ADS1115
×1
Grove - Barometer Sensor (BMP280)
Seeed Grove - Barometer Sensor (BMP280)
×1
Gravity: DHT11 Temperature Humidity Sensor For Arduino
DFRobot Gravity: DHT11 Temperature Humidity Sensor For Arduino
×1
MQ135
×1
AWS IoT EduKit
Amazon Web Services AWS IoT EduKit
×1

Software apps and online services

VS Code
Microsoft VS Code
Visual Studio Code Extension for Arduino
Microsoft Visual Studio Code Extension for Arduino

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires
Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

Read more

Schematics

m5stackcore2_sensors_8XBKjcapZs.png

Code

M5 Stack core2 - External Sensors

C/C++
Interconnection and commissioning of external sensors in the M5Stack Core2, for later use in implementations of IoT applications.
#include <M5Core2.h>
#include <Wire.h>             // I2C comunication
#include <Adafruit_BMP280.h>  //I2C Pressure sensor
#include <Adafruit_ADS1X15.h> //I2C ADC 16 bits
#include <DHT.h>              // Humidity & temperature sensor
#include <FastLED.h>          // LED GRB SK6812

#define NUM_LEDS 10 // leds SK6812
#define DATA_PIN 25 // Pin output to SK6812
#define PIR 36      //Digital pin M5Stack2 Pin 1 Port B
#define DHTPIN 26   //Digital pin M5Stack2 Pin 2 Port B
#define DHTTYPE DHT11

//Class objects
Adafruit_BMP280 bme;
Adafruit_ADS1115 ads;
CRGB leds[NUM_LEDS];
DHT dht(DHTPIN, DHTTYPE);

void setup()
{
  pinMode(PIR, INPUT); //Set pin 36 to input mode.
  M5.begin();          //Init M5Core2.
  Wire.begin();        //Wire init, adding the I2C bus.
  FastLED.addLeds<SK6812, DATA_PIN, GRB>(leds, NUM_LEDS);
  dht.begin(); // Init DHT11
  Serial.begin(115200);

  while (!bme.begin(0x76))
  { //Init this sensor,True if the init was successful, otherwise false.
    M5.Lcd.println("Could not find a valid BMP280 sensor, check wiring!");
  }
  if (!ads.begin())
  {
    Serial.println("Failed to initialize ADS1115.");
    while (1)
      ;
  }

  M5.Lcd.clear(); //Clear the screen.
}

float pressure, Temp; //Store the value of pressure and Temperature.

void loop()
{
  //Condition for the PIR sensor, it also enables the internal LEDs of the M5
  if (digitalRead(PIR) == 1)
  { //If pin 36 reads a value of 1.
    M5.Lcd.setTextSize(3);
    M5.Lcd.setCursor(75, 170);
    M5.Lcd.printf("%-10s", " Sensing");
    leds[0] = CRGB::BlueViolet;
    leds[4] = CRGB::GreenYellow;
    leds[9] = CRGB::BlueViolet;
    leds[5] = CRGB::GreenYellow;
    FastLED.show();
  }
  else
  {
    M5.Lcd.setTextSize(3);
    M5.Lcd.setCursor(75, 170);
    M5.Lcd.printf("%-10s", "Not Sensed");
    leds[0] = CRGB::Black;
    leds[4] = CRGB::Black;
    leds[9] = CRGB::Black;
    leds[5] = CRGB::Black;
    FastLED.show();
  }
  pressure = bme.readPressure();
  Temp = bme.readTemperature();

  int16_t adc0, adc1; //adc2, adc3
  float volts0, Lux;
  adc0 = ads.readADC_SingleEnded(0);
  adc1 = ads.readADC_SingleEnded(1);

  volts0 = ads.computeVolts(adc0);
  Lux = 100000 * ads.computeVolts(adc1) / 5000; // Percent Lux sensor

  // Reading temperature or humidity takes about 250 milliseconds!
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f))
  {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  delay(500);
  // Show measures on display
  M5.Lcd.setCursor(0, 0); //Set the cursor to (0,0)
  M5.Lcd.setTextSize(2);  //Set the font size to 2
  M5.Lcd.printf("Pressure:%2.0fPa\nTemperature:%4.2fC", pressure, Temp);

  M5.Lcd.setCursor(0, 50);
  M5.Lcd.setTextSize(2); //Set the font size to 2
  M5.Lcd.printf("MQ135: %5d %5.2fV \nLDR:   %5d %6.2f%% Lux", adc0, volts0, adc1, Lux);

  M5.Lcd.setCursor(0, 100);
  M5.Lcd.setTextSize(2); //Set the font size to 2
  M5.Lcd.printf("Humidity: %.0f%% \nTemperature:%.2fC  %3.2fF\nHeat Index: %.2fC %6.2fF", h, t, f, hic, hif);

  M5.update(); //Update M5Stack Core2

  delay(100);
  //
  //
}

M5Stack Core2 external Sensors

Interconnection and implementation of external sensors for later use IoT applications. Using the I2C PORTA, PORTB and PORTC ports on the M5 STACK Core2

Credits

Luis Malavé

Luis Malavé

1 project • 1 follower
Code apprentice. 20 years as an electronics Tech and now I start with the programming of embedded systems. Code has become my new passion

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