Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with a touch sensor, a red LED, a buzzer, and an ESP32-CAM module. The touch sensor is used to detect user input, which then controls the LED and buzzer. The ESP32-CAM module is also integrated into the circuit for additional functionality.

Component List

1. Touch Sensor

   • Pins: IO, VCC, GND
   • Description: A touch sensor used to detect user input.
   • Purpose in Circuit: Detects touch input to control other components.

2. LED: Two Pin (red)

   • Pins: Cathode, Anode
   • Description: A red LED.
   • Purpose in Circuit: Provides visual feedback when the touch sensor is activated.

3. ESP32 - CAM

   • Pins: 5V, GND, IO12, IO13, IO15, IO14, IO2, IO4, VOT, VOR, VCC, IO0, IO16, 3V3
   • Description: A camera module with Wi-Fi capabilities.
   • Purpose in Circuit: Provides additional functionality, potentially for capturing images or video.

4. Buzzer

   • Pins: GND, IN
   • Description: A buzzer.
   • Purpose in Circuit: Provides audio feedback when the touch sensor is activated.

5. Arduino Nano

   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK
   • Description: A small, complete, and breadboard-friendly microcontroller board.
   • Purpose in Circuit: Acts as the main controller for the circuit.

Wiring Details

Touch Sensor

• IO connected to D4 of Arduino Nano
• VCC connected to 5V of Arduino Nano
• GND connected to GND of Arduino Nano

LED: Two Pin (red)

• Anode connected to D2 of Arduino Nano
• Cathode connected to GND of Arduino Nano

ESP32 - CAM

• IO12 connected to D5 of Arduino Nano
• IO13 connected to D8 of Arduino Nano
• VCC connected to 3V3 of Arduino Nano
• GND connected to GND of Arduino Nano

Buzzer

• IN connected to D9 of Arduino Nano
• GND connected to GND of Arduino Nano

Arduino Nano

• D4 connected to IO of Touch Sensor
• 5V connected to VCC of Touch Sensor
• GND connected to GND of Touch Sensor, LED, and Buzzer
• D2 connected to Anode of LED
• D5 connected to IO12 of ESP32 - CAM
• D8 connected to IO13 of ESP32 - CAM
• 3V3 connected to VCC of ESP32 - CAM
• GND connected to GND of ESP32 - CAM
• D9 connected to IN of Buzzer

Code Documentation

Arduino Nano Code

#define BUTTON_PIN 4 
#define USER_PIN 8

int isPressed = LOW, pres_state = LOW;

void setup() 
{
  pinMode(BUTTON_PIN, INPUT);
  pinMode(USER_PIN, INPUT); 

  pinMode(2, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() 
{
    if(digitalRead(USER_PIN) == HIGH && pres_state == LOW) pres_state = HIGH;
    else if(digitalRead(USER_PIN) == HIGH && pres_state == HIGH) pres_state = LOW;

    isPressed = digitalRead(BUTTON_PIN);

    if (isPressed != LOW && pres_state == HIGH)
    {
        digitalWrite(9, HIGH);
        digitalWrite(2, HIGH);
        digitalWrite(5, HIGH);
    } 
    else
    {
        digitalWrite(9, LOW);
        digitalWrite(2, LOW);
        digitalWrite(5, LOW);
    }
}

Code Explanation

• BUTTON_PIN and USER_PIN are defined as pins 4 and 8 respectively.
• The setup() function initializes the pin modes for the touch sensor, LED, and buzzer.
• The loop() function continuously checks the state of the touch sensor and user input.
• If the touch sensor is pressed and the user input is active, the LED and buzzer are turned on.
• If the touch sensor is not pressed or the user input is inactive, the LED and buzzer are turned off.