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ESP32-Based Smart Arena System with IR Sensor, Keypad, and OLED Display

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Circuit Documentation

Summary

This document provides a detailed overview of a circuit design that includes an ESP32 microcontroller, an IR sensor, a 4x4 membrane matrix keypad, a servo motor, an OLED display, two 12V relays, a loudspeaker, a 5V power supply unit (PSU), a 5V battery, a 12V power LED, and a buzzer. The circuit is designed to detect objects using the IR sensor, control relays and a servo motor, display information on an OLED screen, and provide audio feedback through a buzzer and loudspeaker.

Component List

  1. ESP32

    • Description: Microcontroller with Wi-Fi and Bluetooth capabilities.
    • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

  2. IR Sensor

    • Description: Infrared sensor for object detection.
    • Pins: out, gnd, vcc

  3. 4x4 Membrane Matrix Keypad

    • Description: Keypad with 4 rows and 4 columns.
    • Pins: R1, R2, R3, R4, C1, C2, C3, C4

  4. Servo

    • Description: Servo motor for precise control of angular position.
    • Pins: GND, VCC, PWM

  5. OLED Display 2.42"

    • Description: 2.42-inch OLED display.
    • Pins: GND, VCC, SCK, SDA, RES, DC, CS

  6. 12V Relay

    • Description: Relay for switching high voltage devices.
    • Pins: NO, COM, NC, IN, DC-, DC+

  7. Loudspeaker

    • Description: Loudspeaker for audio output.
    • Pins: pin1, pin2

  8. 5V PSU

    • Description: 5V power supply unit.
    • Pins: 5V+, GND, 5V OK, PE, N, L

  9. 5V Battery

    • Description: 5V battery for power supply.
    • Pins: +, -

  10. Power LED 12V 10W 0.8-0.9A

    • Description: High-power LED.
    • Pins: +, -

  11. Buzzer

    • Description: Buzzer for audio feedback.
    • Pins: GND, IN

Wiring Details

ESP32

  • D34 connected to IR Sensor out
  • D32 connected to Keypad R1
  • D33 connected to Keypad R2
  • D25 connected to Keypad R3
  • D26 connected to Keypad R4
  • D27 connected to Keypad C1
  • D14 connected to Keypad C2
  • D12 connected to Keypad C3
  • D13 connected to Keypad C4
  • GND connected to 5V PSU GND, OLED Display GND, IR Sensor gnd, Buzzer GND, Servo GND
  • VIN connected to 5V PSU 5V+
  • 3V3 connected to OLED Display VCC
  • D15 connected to Servo PWM
  • D4 connected to Buzzer IN
  • D18 connected to OLED Display SCK
  • D19 connected to OLED Display SDA, Relay 1 IN
  • D21 connected to OLED Display RES
  • D22 connected to OLED Display DC
  • D23 connected to OLED Display CS, Relay 2 IN

IR Sensor

  • out connected to ESP32 D34
  • gnd connected to ESP32 GND
  • vcc connected to 5V PSU 5V+

4x4 Membrane Matrix Keypad

  • R1 connected to ESP32 D32
  • R2 connected to ESP32 D33
  • R3 connected to ESP32 D25
  • R4 connected to ESP32 D26
  • C1 connected to ESP32 D27
  • C2 connected to ESP32 D14
  • C3 connected to ESP32 D12
  • C4 connected to ESP32 D13

Servo

  • GND connected to ESP32 GND
  • VCC connected to 5V Battery +
  • PWM connected to ESP32 D15

OLED Display 2.42"

  • GND connected to ESP32 GND
  • VCC connected to ESP32 3V3
  • SCK connected to ESP32 D18
  • SDA connected to ESP32 D19
  • RES connected to ESP32 D21
  • DC connected to ESP32 D22
  • CS connected to ESP32 D23

12V Relay 1

  • NO connected to Power LED -
  • COM connected to Power LED +
  • IN connected to ESP32 D19
  • DC- connected to 5V PSU GND
  • DC+ connected to 5V PSU 5V+

12V Relay 2

  • NO connected to Loudspeaker pin1
  • COM connected to Loudspeaker pin2
  • IN connected to ESP32 D23
  • DC- connected to 5V PSU GND
  • DC+ connected to 5V PSU 5V+

Loudspeaker

  • pin1 connected to Relay 2 NO
  • pin2 connected to Relay 2 COM

5V PSU

  • 5V+ connected to ESP32 VIN, OLED Display VCC, IR Sensor vcc, Relay 1 DC+, Relay 2 DC+
  • GND connected to ESP32 GND, OLED Display GND, IR Sensor gnd, Buzzer GND, Servo GND, Relay 1 DC-, Relay 2 DC-

5V Battery

  • + connected to Servo VCC
  • - not connected

Power LED 12V 10W 0.8-0.9A

  • + connected to Relay 1 COM
  • - connected to Relay 1 NO

Buzzer

  • GND connected to ESP32 GND
  • IN connected to ESP32 D4

Documented Code

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>
#include <ESP32Servo.h> // Use the correct Servo library for ESP32

// OLED display settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
#define SSD1306_I2C_ADDRESS 0x3C // Define the I2C address for the OLED
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Keypad settings
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {32, 33, 25, 26}; // Connect to the row pinouts of the keypad
byte colPins[COLS] = {27, 14, 12, 13}; // Connect to the column pinouts of the keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Servo settings
Servo myservo;
const int servoPin = 15;

// IR sensor settings
const int irSensorPin = 34;

// Relay settings
const int relay1Pin = 19;
const int relay2Pin = 23;

// Buzzer settings
const int buzzerPin = 4;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize OLED display
  if(!display.begin