Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various sensors, a relay, an LCD display, and a GPS module, all controlled by an Arduino Micro (Rev3). The circuit is powered by two 18650 Li-ion batteries and includes components such as a light sensor, sound sensor, and MPU-6050 accelerometer and gyroscope. The Arduino Micro is programmed to read sensor data, control the relay, and display information on the LCD.

Component List

1. GPS NEO 6M

   • Pins: VCC, RX, TX, GND
   • Description: GPS module for location tracking.

2. MPU-6050

   • Pins: VCC, GND, SCL, SDA, XDA, XCL, AD0, INT
   • Description: Accelerometer and gyroscope sensor.

3. Lcd 20x4 i2c

   • Pins: GND, 5V, SCA, SCL
   • Description: 20x4 character LCD display with I2C interface.

4. Light Sensor

   • Pins: GND, UCC, NC, SIG
   • Description: Sensor to detect light intensity.

5. Arduino Micro (Rev3)

   • Pins: MISO, 5V, SCK, MOSI, RESET, GND, RXLED/SS, D1/TX, D0/RX, D2/SDA, D3/SCL, D4 PWM/A6, D5 PWM, D6 PWM/A7, D7, D8 PWM/A8, D9 PWM/A9, D10 PWM/A10, D11 PWM, D12 PWM/A11, VIN, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13 PWM
   • Description: Microcontroller board based on the ATmega32U4.

6. 18650 Li-ion Battery x 2

   • Pins: +, -
   • Description: Rechargeable lithium-ion batteries.

7. 3104 Push Button

   • Pins: pin 2, pin 5, pin 1, pin 3, pin 6, pin 4
   • Description: Push button for user input.

8. Sound Sensor

   • Pins: 5V +, OUT, GND
   • Description: Sensor to detect sound levels.

9. 5V Relay

   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC
   • Description: Relay module for switching high-power devices.

10. Battery Level

    • Pins: +, -
    • Description: Battery level indicator.

Wiring Details

GPS NEO 6M

• VCC connected to 5V (common power net)
• RX connected to D3/SCL on Arduino Micro
• TX connected to D4 PWM/A6 on Arduino Micro
• GND connected to GND (common ground net)

MPU-6050

• VCC connected to 5V (common power net)
• GND connected to GND (common ground net)
• SCL connected to A5 on Arduino Micro
• SDA connected to A4 on Arduino Micro

Lcd 20x4 i2c

• GND connected to GND (common ground net)
• 5V connected to 5V (common power net)
• SCA connected to A5 on Arduino Micro
• SCL connected to D3/SCL on Arduino Micro

Light Sensor

• GND connected to GND (common ground net)
• UCC connected to 5V (common power net)
• SIG connected to A0 on Arduino Micro

Arduino Micro (Rev3)

• 5V connected to 5V (common power net)
• GND connected to GND (common ground net)
• D2/SDA connected to In on 5V Relay
• D3/SCL connected to RX on GPS NEO 6M and SCL on Lcd 20x4 i2c
• D4 PWM/A6 connected to TX on GPS NEO 6M
• A5 connected to SCL on MPU-6050 and SCA on Lcd 20x4 i2c
• A4 connected to SDA on MPU-6050
• A0 connected to SIG on Light Sensor
• D12 PWM/A11 connected to OUT on Sound Sensor

18650 Li-ion Battery x 2

• + connected to Common terminal on 5V Relay
• - connected to GND (common ground net)

3104 Push Button

• pin 2 connected to RX on GPS NEO 6M
• pin 1 connected to GND (common ground net)

Sound Sensor

• 5V + connected to 5V (common power net)
• OUT connected to D12 PWM/A11 on Arduino Micro
• GND connected to GND (common ground net)

5V Relay

• Normally Open connected to 5V (common power net)
• Common terminal connected to + on 18650 Li-ion Battery x 2
• In connected to D2/SDA on Arduino Micro
• GND connected to GND (common ground net)
• VCC connected to 5V (common power net)

Battery Level

• + connected to 5V (common power net)
• - connected to GND (common ground net)

Code Documentation

Arduino Micro (Rev3) Code

const int buttonPin = 3; // Pin connected to the push button
const int relayPin = 2;  // Pin connected to the relay

bool relayState = false; // Current state of the relay
bool lastButtonState = LOW; // Previous state of the button
bool buttonPressed = false; // Flag to indicate if the button was pressed

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Ensure relay is off initially
}

void loop() {
  bool currentButtonState = digitalRead(buttonPin);

  // Check if the button is pressed
  if (currentButtonState == HIGH && lastButtonState == LOW) {
    buttonPressed = !buttonPressed; // Toggle the button pressed flag
  }

  // Update the relay state based on the button press
  if (buttonPressed) {
    relayState = !relayState; // Toggle the relay state
    digitalWrite(relayPin, relayState ? HIGH : LOW); // Update the relay output
    buttonPressed = false; // Reset the button pressed flag
  }

  lastButtonState = currentButtonState; // Update the last button state
}

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <TinyGPS++.h>
#include <SoftwareSerial.h>

// Initialize the LCD
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Initialize the GPS
TinyGPSPlus gps;
SoftwareSerial ss(4, 3); // RX, TX

void setup() {
  lcd.begin();
  lcd.backlight();
  ss.begin(9600);
}

void loop() {
  while (ss.available() > 0) {
    gps.encode(ss.read());
    if (gps.speed.isUpdated()) {
      float speed = gps.speed.kmph();
      lcd.setCursor(0, 0);
      lcd.print("Speed: ");
      lcd.print(speed, 1); // Display speed with one decimal place
      lcd.print(" km/h");
    }
  }
}

This code initializes the Arduino Micro to read inputs from a push button and control a relay. It also sets up an LCD display and a GPS module to show the speed in km/h. The relay state is toggled based on the button press, and the GPS data is continuously read and displayed on the LCD.