Circuit Documentation

Summary

This circuit involves two Arduino Uno R3 microcontrollers, a 433 MHz RF Receiver Module, an FS1000A 433MHz RF Transmitter, a red LED, and a 1k Ohm resistor. The circuit is designed to transmit and receive data wirelessly using the 433 MHz frequency. The transmitter sends a "Hello" message every 200ms, and the receiver turns on an LED when it successfully receives a message.

Component List

433 MHz RF Receiver Module

• Description: A module used to receive data transmitted at 433 MHz.
• Pins: VCC, DATA, GND

Arduino Uno R3

• Description: A microcontroller board based on the ATmega328P.
• Pins: D8, D9, D10, D11, D12, D13, GND, AREF, SDA, SCL, D0/RX, D1/Tx, D2, D3, D4, D5, 6, D7, A5/SCL, A4/SDA, A3, A2, A1, A0, Vin, 5V, 3.3V, RESET, IOREF, NONE, USB Jack, Power Jack

Resistor

• Description: A passive electrical component that implements electrical resistance as a circuit element.
• Pins: pin1, pin2
• Properties:
  • Resistance: 1000 Ohms

LED: Two Pin (red)

• Description: A light-emitting diode that emits red light.
• Pins: cathode, anode

FS1000A 433MHz RF Transmitter

• Description: A module used to transmit data at 433 MHz.
• Pins: DATA, VCC, GND, ANT

Wiring Details

433 MHz RF Receiver Module

• VCC connected to Arduino Uno R3 (5V)
• DATA connected to Arduino Uno R3 (D2)
• GND connected to Arduino Uno R3 (GND)

Arduino Uno R3 (Receiver)

• D2 connected to 433 MHz RF Receiver Module (DATA)
• 5V connected to 433 MHz RF Receiver Module (VCC)
• GND connected to 433 MHz RF Receiver Module (GND)
• D3 connected to Resistor (pin1)
• GND connected to LED (cathode)

Resistor

• pin1 connected to Arduino Uno R3 (D3)
• pin2 connected to LED (anode)

LED: Two Pin (red)

• cathode connected to Arduino Uno R3 (GND)
• anode connected to Resistor (pin2)

FS1000A 433MHz RF Transmitter

• DATA connected to Arduino Uno R3 (D2)
• VCC connected to Arduino Uno R3 (5V)
• GND connected to Arduino Uno R3 (GND)

Arduino Uno R3 (Transmitter)

• D2 connected to FS1000A 433MHz RF Transmitter (DATA)
• 5V connected to FS1000A 433MHz RF Transmitter (VCC)
• GND connected to FS1000A 433MHz RF Transmitter (GND)

Code Documentation

Arduino Uno R3 (Receiver)

#include <VirtualWire.h>

void setup() {
  pinMode(3, OUTPUT); // Set pin for LED
  vw_set_rx_pin(2);   // Set the RX pin
  vw_setup(2000);     // Bits per second
  vw_rx_start();      // Start the receiver
}

void loop() {
  uint8_t buf[VW_MAX_MESSAGE_LEN];
  uint8_t buflen = VW_MAX_MESSAGE_LEN;

  if (vw_get_message(buf, &buflen)) { // Non-blocking
    digitalWrite(3, HIGH); // Turn on LED
  } else {
    digitalWrite(3, LOW); // Turn off LED
  }
}

Arduino Uno R3 (Transmitter)

#include <VirtualWire.h>

void setup() {
  vw_set_tx_pin(2); // Set the TX pin
  vw_setup(2000);   // Bits per second
}

void loop() {
  const char *msg = "Hello";
  vw_send((uint8_t *)msg, strlen(msg));
  vw_wait_tx(); // Wait until the message is sent
  delay(200);   // Send message every 200ms
}