Circuit Documentation

Summary

This circuit involves two Arduino Nano microcontrollers, a pushbutton, two resistors, and a red LED. The circuit is designed to read the state of a pushbutton and transmit this state to another Arduino Nano, which then controls an LED based on the received state.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • 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

2. Pushbutton

   • Description: A simple pushbutton switch.
   • Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

3. Resistor (10k Ohms)

   • Description: A resistor with a resistance of 10k Ohms.
   • Pins: pin1, pin2

4. LED: Two Pin (red)

   • Description: A red LED with two pins.
   • Pins: cathode, anode

5. Resistor (330 Ohms)

   • Description: A resistor with a resistance of 330 Ohms.
   • Pins: pin1, pin2

Wiring Details

Arduino Nano (1)

• D2: Connected to Pin 1 (in) of the Pushbutton
• GND: Connected to pin1 of the 10k Ohm Resistor and pin1 of the 330 Ohm Resistor
• 5V: Connected to Pin 4 (out) of the Pushbutton
• A5: Connected to A5 of Arduino Nano (2)
• A4: Connected to A4 of Arduino Nano (2)

Arduino Nano (2)

• GND: Connected to pin1 of the 10k Ohm Resistor and pin1 of the 330 Ohm Resistor
• 5V: Connected to Pin 4 (out) of the Pushbutton
• A5: Connected to A5 of Arduino Nano (1)
• A4: Connected to A4 of Arduino Nano (1)
• D3: Connected to the anode of the red LED

Pushbutton

• Pin 1 (in): Connected to D2 of Arduino Nano (1)
• Pin 2 (in): Connected to pin2 of the 10k Ohm Resistor
• Pin 3 (out): Not connected
• Pin 4 (out): Connected to 5V of both Arduino Nano (1) and Arduino Nano (2)

Resistor (10k Ohms)

• pin1: Connected to GND of both Arduino Nano (1) and Arduino Nano (2)
• pin2: Connected to Pin 2 (in) of the Pushbutton

Resistor (330 Ohms)

• pin1: Connected to GND of both Arduino Nano (1) and Arduino Nano (2)
• pin2: Connected to the cathode of the red LED

LED: Two Pin (red)

• cathode: Connected to pin2 of the 330 Ohm Resistor
• anode: Connected to D3 of Arduino Nano (2)

Code Documentation

Arduino Nano (1) Code

#include <Wire.h>
int pushButton = A0;
int x = 0;

void setup() {
  Wire.begin();
  pinMode(pushButton, INPUT);
}

void loop() {
  Wire.beginTransmission(1);
  x = digitalRead(pushButton);
  Wire.write(x);
  Wire.endTransmission();
  delay(500);
}

• Description: This code reads the state of the pushbutton and transmits it via I2C to the second Arduino Nano.
• Libraries Used: Wire.h
• Pin Definitions:
  • pushButton is connected to A0.
• Functions:
  • setup(): Initializes the I2C communication and sets the pushbutton pin as input.
  • loop(): Reads the state of the pushbutton, transmits the state via I2C, and waits for 500 milliseconds.

Arduino Nano (2) Code

#include <Wire.h>
int pinLed = 13;
int x = 0;

void setup() {
  Wire.begin(1);
  Wire.onReceive(receiveEvent);
  pinMode(pinLed, OUTPUT);
}

void loop() {
  delay(100);
}

void receiveEvent(int howMany) {
  x = Wire.read();
  if (x == 1) {
    digitalWrite(pinLed, HIGH);
  } else {
    digitalWrite(pinLed, LOW);
  }
}

• Description: This code receives the state of the pushbutton from the first Arduino Nano via I2C and controls the LED based on the received state.
• Libraries Used: Wire.h
• Pin Definitions:
  • pinLed is connected to D13.
• Functions:
  • setup(): Initializes the I2C communication, sets up the receive event handler, and sets the LED pin as output.
  • loop(): Waits for 100 milliseconds.
  • receiveEvent(int howMany): Reads the state from I2C and sets the LED state accordingly.