Circuit Documentation

Summary

This circuit consists of various components including an Arduino UNO, sensors, LEDs, a keypad, an LCD, and a buzzer. The circuit is designed to perform multiple functions such as detecting obstacles using an ultrasonic sensor, reading sound levels, displaying information on an LCD, and evaluating password strength entered via a keypad. The RGB LED and other LEDs provide visual feedback based on sensor inputs and password strength.

Component List

1. 4X4 Membrane Matrix Keypad

   • Pins: R1, R2, R3, R4, C1, C2, C3, C4
   • Description: A keypad used for inputting passwords.
   • Purpose: To allow user input for password evaluation.

2. 8x8 Matrix

   • Pins: vcc, DIN, clk, CS, Gnd, gnd, CLK
   • Description: An 8x8 LED matrix.
   • Purpose: To display patterns or information visually.

3. Arduino UNO

   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0
   • Description: A microcontroller board.
   • Purpose: To control the circuit and execute the embedded code.

4. Ultrasonic Sensor

   • Pins: +VCC, Trigger, Echo, GND
   • Description: A sensor to measure distance.
   • Purpose: To detect obstacles and measure distance.

5. LED: Two Pin (red)

   • Pins: cathode, anode
   • Description: A red LED.
   • Purpose: To provide visual feedback.

6. LED: Two Pin (green)

   • Pins: cathode, anode
   • Description: A green LED.
   • Purpose: To provide visual feedback.

7. LED: Two Pin (yellow)

   • Pins: cathode, anode
   • Description: A yellow LED.
   • Purpose: To provide visual feedback.

8. Resistor

   • Pins: pin1, pin2
   • Description: A resistor with 200 Ohms resistance.
   • Purpose: To limit current through LEDs.

9. 16x2 I2C LCD

   • Pins: GND, VCC, SDA, SCL
   • Description: A 16x2 character LCD with I2C interface.
   • Purpose: To display information.

10. Buzzer

    • Pins: PIN, GND
    • Description: A buzzer.
    • Purpose: To provide audible feedback.

11. RGB LED (Wokwi compatible)

    • Pins: R, COM, G, B
    • Description: An RGB LED.
    • Purpose: To provide multi-color visual feedback.

12. Sound Sensor

    • Pins: Analog, GND, VCC, Digital
    • Description: A sensor to detect sound levels.
    • Purpose: To detect sound and provide input to the microcontroller.

Wiring Details

4X4 Membrane Matrix Keypad

• R1 to Arduino UNO D9
• R2 to Arduino UNO D8
• R3 to Arduino UNO D7
• R4 to Arduino UNO D6
• C1 to Arduino UNO D5
• C2 to Arduino UNO D4
• C3 to Arduino UNO D3
• C4 to Arduino UNO D2

8x8 Matrix

• vcc to Arduino UNO 5V
• DIN to Arduino UNO A3
• clk to Arduino UNO A1
• CS to Arduino UNO A2
• Gnd to Arduino UNO GND

Arduino UNO

• 5V to Ultrasonic Sensor +VCC, Sound Sensor VCC, 8x8 Matrix vcc, 16x2 I2C LCD VCC
• GND to Ultrasonic Sensor GND, Sound Sensor GND, RGB LED COM, 8x8 Matrix Gnd, 16x2 I2C LCD GND, Resistors pin1
• A0 to Buzzer PIN
• A1 to 8x8 Matrix clk
• A2 to 8x8 Matrix CS
• A3 to 8x8 Matrix DIN
• A4 to 16x2 I2C LCD SDA
• A5 to 16x2 I2C LCD SCL
• D13 to LED (green) anode
• D12 to LED (yellow) anode
• D11 to LED (red) anode
• D9 to Ultrasonic Sensor Trigger
• D8 to Ultrasonic Sensor Echo
• D6 to RGB LED B
• D5 to RGB LED G
• D3 to RGB LED R
• D11 to Sound Sensor Digital

Ultrasonic Sensor

• +VCC to Arduino UNO 5V
• Trigger to Arduino UNO D9
• Echo to Arduino UNO D8
• GND to Arduino UNO GND

LED: Two Pin (red)

• anode to Arduino UNO D11
• cathode to Resistor pin2

LED: Two Pin (green)

• anode to Arduino UNO D13
• cathode to Resistor pin2

LED: Two Pin (yellow)

• anode to Arduino UNO D12
• cathode to Resistor pin2

Resistor

• pin1 to Arduino UNO GND
• pin2 to LED (red) cathode, LED (green) cathode, LED (yellow) cathode

16x2 I2C LCD

• GND to Arduino UNO GND
• VCC to Arduino UNO 5V
• SDA to Arduino UNO A4
• SCL to Arduino UNO A5

Buzzer

• PIN to Arduino UNO A0
• GND to Resistor pin1

RGB LED (Wokwi compatible)

• R to Arduino UNO D3
• COM to Arduino UNO GND
• G to Arduino UNO D5
• B to Arduino UNO D6

Sound Sensor

• Analog (not connected)
• GND to Arduino UNO GND
• VCC to Arduino UNO 5V
• Digital to Arduino UNO D11

Documented Code

Arduino UNO (Instance 1)

// Pin Definitions
const int trigPin = 9;
const int echoPin = 8;
const int redPin = 3;
const int greenPin = 5;
const int bluePin = 6;
const int micPin = 11;

// Thresholds
const int distanceThreshold = 20; // in cm
const int soundThreshold = 500;  // Adjust based on sound module output
const int debounceDelay = 200;   // Debounce delay for sound input in ms

// Variables
long duration;
int distance;
bool stopCommand = false;       // Tracks if the "stop" command has been detected
static unsigned long lastSoundTime = 0;

void setup() {
  // Ultrasonic Sensor
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // RGB LED
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);

  // Microphone
  pinMode(micPin, INPUT);

  // Serial Monitor
  Serial.begin(9600);
}

void loop() {
  // Measure distance using Ultrasonic Sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2; // Convert to cm

  // Read sound level
  int soundLevel = analogRead(micPin);
  Serial.print("Sound Level: ");
  Serial.print(soundLevel);
  Serial.print(" | Distance: ");
  Serial.print(distance);
  Serial.print(" cm | Stop Command: ");
  Serial.println(stopCommand ? "ON" : "OFF");

  // Check for the "stop" command
  if (soundLevel > soundThreshold