Circuit Documentation

Summary

The circuit in question is designed to interface an Arduino UNO microcontroller with a KY-015 DHT11 temperature and humidity sensor, an MPU-6050 accelerometer and gyroscope module, and two pushbuttons. The circuit is powered by the Arduino's 5V output and includes a 10kΩ pull-up resistor for one of the pushbuttons. The Arduino UNO is programmed to read data from the DHT11 and MPU-6050 sensors and to detect button presses, which trigger immediate sensor readings. The sensor data is then output to the Serial Monitor.

Component List

KY-015 DHT11 Temperature and Humidity Sensor

• Pins: 5V, S, GND
• Description: A basic, low-cost digital temperature and humidity sensor.

MPU-6050 Accelerometer and Gyroscope

• Pins: VCC, GND, SCL, SDA, XDA, XCL, AD0, INT
• Description: A motion-tracking device with a 3-axis accelerometer and a 3-axis gyroscope.

Pushbutton (x2)

• Pins: Pin 1, Pin 2, Pin 3, Pin 4
• Description: A simple switch mechanism for control of a machine or some type of process.

Arduino UNO

• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13
• Description: A microcontroller board based on the ATmega328P, widely used for building digital devices and interactive objects.

Resistor

• Pins: pin1, pin2
• Description: A passive two-terminal electrical component that implements electrical resistance as a circuit element.
• Properties: 10kΩ resistance

Wiring Details

KY-015 DHT11

• 5V: Connected to the 5V power supply from the Arduino UNO.
• S: Connected to digital pin D2 on the Arduino UNO.
• GND: Connected to the ground (GND) on the Arduino UNO.

MPU-6050

• VCC: Connected to the 5V power supply from the Arduino UNO.
• GND: Connected to the ground (GND) on the Arduino UNO.
• SCL: Connected to analog pin A5 on the Arduino UNO.
• SDA: Connected to analog pin A4 on the Arduino UNO.

Pushbutton 1

• Pin 1: Connected to one terminal of the 10kΩ resistor.
• Pin 2: Not connected.
• Pin 3: Connected to the ground (GND) on the Arduino UNO.
• Pin 4: Connected to the ground (GND) on the Arduino UNO.

Pushbutton 2

• Pin 1: Not connected.
• Pin 2: Not connected.
• Pin 3: Not connected.
• Pin 4: Not connected.

Arduino UNO

• 5V: Provides power to the KY-015 DHT11 and MPU-6050.
• GND: Common ground for the circuit.
• D2: Receives the signal from the KY-015 DHT11 sensor.
• A4: Connected to the SDA pin of the MPU-6050.
• A5: Connected to the SCL pin of the MPU-6050.
• D3: Connected to one terminal of the 10kΩ resistor (other terminal connected to Pushbutton 1).

Resistor

• pin1: Connected to digital pin D3 on the Arduino UNO.
• pin2: Connected to Pin 1 of Pushbutton 1.

Documented Code

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_MPU6050.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN 2     // DHT11 data pin connected to digital pin 2
#define DHTTYPE DHT11
#define BUTTON_PIN 3 // Push button connected to digital pin 3

DHT dht(DHTPIN, DHTTYPE);
Adafruit_MPU6050 mpu;

volatile bool buttonPressed = false;

void setup() {
  Serial.begin(9600);
  dht.begin();
  if (!mpu.begin()) {
    Serial.println("Failed to find MPU6050 chip");
    while (1) {
      delay(10);
    }
  }
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), buttonISR, FALLING);
}

void loop() {
  static unsigned long lastReadTime = 0;
  unsigned long currentTime = millis();

  if (buttonPressed || (currentTime - lastReadTime >= 2000)) {
    readSensors();
    lastReadTime = currentTime;
    buttonPressed = false;
  }
}

void readSensors() {
  // Read DHT11 sensor
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  
  // Read MPU6050 sensor
  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  // Print sensor data to Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Acceleration: ");
  Serial.print("X: ");
  Serial.print(a.acceleration.x);
  Serial.print(" m/s^2, Y: ");
  Serial.print(a.acceleration.y);
  Serial.print(" m/s^2, Z: ");
  Serial.print(a.acceleration.z);
  Serial.println(" m/s^2");
}

void buttonISR() {
  buttonPressed = true;
}

This code initializes the DHT11 and MPU6050 sensors and sets up an interrupt to detect when Pushbutton 1 is pressed. When the button is pressed or every 2 seconds, the readSensors function is called to read and print the temperature, humidity, and acceleration values to the Serial Monitor.