Circuit Documentation

Summary

This project involves an interactive system that uses an Arduino UNO to control various components including a stepper motor, a servo motor, an ultrasonic sensor, a force sensing resistor, a DFPlayer Mini for audio playback, and a relay to control a light bulb. The system detects the presence of an owner using the ultrasonic sensor and changes the cat's face to happy or sad accordingly. It also opens or closes a heart and turns on or off a light based on the force sensor input.

Component List

1. Stepper Motor (Bipolar)

   • Pins: D, B, C, A
   • Description: A bipolar stepper motor used to open and close a heart.

2. Force Sensing Resistor

   • Pins: pin 0, pin 1
   • Description: A sensor used to detect force or pressure, such as a pat.

3. ULN 2003

   • Pins: IN1, IN2, IN3, IN4, IN5, IN6, IN7, GND, +, COIL1, COIL2, COIL3, COIL4, COIL5
   • Description: A Darlington transistor array used to drive the stepper motor.

4. 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: The main microcontroller used to control the entire system.

5. BULB

   • Pins: +, -
   • Description: A light bulb controlled by a relay.

6. 1-Channel Relay (5V 10A)

   • Pins: NC, signal, C, power, NO, ground
   • Description: A relay used to control the light bulb.

7. HC-SR04 Ultrasonic Sensor

   • Pins: VCC, TRIG, ECHO, GND
   • Description: An ultrasonic sensor used to detect the presence of the owner.

8. 2x 18650

   • Pins: vcc, gnd
   • Description: A battery pack used to power the Arduino UNO.

9. Resistor (200 Ohms)

   • Pins: pin1, pin2
   • Description: A resistor used in the circuit.

10. Resistor (1000 Ohms)

    • Pins: pin1, pin2
    • Description: Another resistor used in the circuit.

11. AC source

    • Pins: +, -
    • Description: An AC power source.

12. Micro servo 9G

    • Pins: GND, +5V, PWM
    • Description: A servo motor used to control the cat's face.

13. Loudspeaker

    • Pins: pin1, pin2
    • Description: A loudspeaker used for audio output.

14. DFPlayer MINI

    • Pins: VCC, BUSY, RX, USB -, TX, USB +, DAC_R, K2/ADC_KEY, DAC_L, K1/ADC_KEY, SPK1, IO 2, GND, SPK2, IO 1
    • Description: An MP3 player module used to play sounds.

Wiring Details

Stepper Motor (Bipolar)

• Pin D to ULN 2003 COIL3
• Pin B to ULN 2003 COIL2
• Pin C to ULN 2003 COIL4
• Pin A to ULN 2003 COIL1

Force Sensing Resistor

• Pin 0 to Resistor (200 Ohms) pin2
• Pin 1 to 5V (Arduino UNO)

ULN 2003

• IN1 to D8 (Arduino UNO)
• IN2 to D9 (Arduino UNO)
• IN3 to D10 (Arduino UNO)
• IN4 to D11 (Arduino UNO)
• GND to GND (Arduino UNO)
• + to 5V (Arduino UNO)

Arduino UNO

• A0 to Resistor (200 Ohms) pin1
• D3 to DFPlayer MINI TX
• D4 to Resistor (1000 Ohms) pin1
• D6 to 1-Channel Relay signal
• D5 to Micro servo 9G PWM
• D13 to HC-SR04 Ultrasonic Sensor TRIG
• D12 to HC-SR04 Ultrasonic Sensor ECHO
• Vin to 2x 18650 vcc
• GND to 2x 18650 gnd

BULB

• + to 1-Channel Relay C
• - to AC source -

1-Channel Relay (5V 10A)

• signal to D6 (Arduino UNO)
• power to 5V (Arduino UNO)
• ground to GND (Arduino UNO)
• NO to AC source +

HC-SR04 Ultrasonic Sensor

• VCC to 5V (Arduino UNO)
• TRIG to D13 (Arduino UNO)
• ECHO to D12 (Arduino UNO)
• GND to GND (Arduino UNO)

2x 18650

• vcc to Vin (Arduino UNO)
• gnd to GND (Arduino UNO)

Resistor (200 Ohms)

• pin1 to A0 (Arduino UNO)
• pin2 to Force Sensing Resistor pin 0

Resistor (1000 Ohms)

• pin1 to D4 (Arduino UNO)
• pin2 to DFPlayer MINI RX

AC source

• + to 1-Channel Relay NO
• - to BULB -

Micro servo 9G

• GND to GND (Arduino UNO)
• +5V to 5V (Arduino UNO)
• PWM to D5 (Arduino UNO)

Loudspeaker

• pin1 to DFPlayer MINI SPK2
• pin2 to DFPlayer MINI SPK1

DFPlayer MINI

• VCC to 5V (Arduino UNO)
• GND to GND (Arduino UNO)
• TX to D3 (Arduino UNO)
• RX to Resistor (1000 Ohms) pin2
• SPK1 to Loudspeaker pin2
• SPK2 to Loudspeaker pin1

Code Documentation

/*
 * This Arduino sketch controls a cat face display with a servo motor, a stepper motor
 * for opening and closing a heart, an ultrasonic sensor for detecting the owner's
 * presence, a force sensor for detecting pats, and a DFPlayer Mini for playing
 * sounds. The system changes the cat's face to happy or sad based on the owner's
 * presence and plays corresponding sounds. It also opens or closes the heart and
 * turns on or off a light based on the force sensor input.
 */

#include <Stepper.h>
#include <Servo.h>
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

// Pin Definitions
const int trigPin = 13;
const int echoPin = 12;
const int forceSensorPin = A0;  // Force sensor connected to analog pin A0
const int lightPin = 6;         // Light bulb control pin (Relay or transistor)
const int servoPin = 5;         // Servo motor control pin
const int rxPin = 4;            // RX pin for DFPlayer Mini
const int txPin = 3;            // TX pin for DFPlayer Mini

// Stepper Motor Settings
const int stepsPerRevolution = 2048;  // Adjust this value to match your stepper motor
Stepper stepperMotor(stepsPerRevolution, 8, 10, 9, 11);  // Stepper motor pins

// Servo Motor
Servo catFaceServo;
int catFacePosition = 0;  // Initial position: 0 for sad face, 180 for happy face

// DFPlayer Mini
SoftwareSerial mySerial(rxPin, txPin);  // RX and TX pins for DFPlayer Mini
DFRobotDFPlayerMini myDFPlayer;

// State Variables
bool lightOn = false;     // Tracks if the light is ON or OFF
bool heartOpened = false; // Tracks if the heart is OPEN or CLOSED

void setup() {