Arduino Uno Rev3: Pinout Diagram, Features and Applications

The Arduino Uno Rev3 is a microcontroller board that is part of the Arduino family of products. Arduino is an open-source hardware and software company that designs and manufactures single-board microcontrollers and microcontroller kits for building digital devices.

The Arduino Uno Rev3 is a microcontroller board that utilizes the ATmega328P microprocessor. It operates at a voltage of 5V and has a recommended input voltage of 7-12V, with a limit of 6-20V.

Technical specifications of the ATmega328P microcontroller:

Please note that the ATmega328P uses 5V logic levels, so it might not be compatible with 3.3V sensors and other peripherals. This can be overcome using level shifting circuits.

This board is equipped with 14 digital input/output (I/O) pins, 6 of which provide pulse width modulation (PWM) output. It also has 6 PWM digital I/O pins and 6 analog input pins. Each I/O pin can handle a direct current (DC) of up to 20 mA, while the 3.3V pin can handle a DC current of 50 mA.

In terms of memory, the Arduino Uno Rev3 has 32 KB of flash memory (ATmega328P), with 0.5 KB used by the bootloader. It also has 2 KB of static random-access memory (SRAM) and 1 KB of electrically erasable programmable read-only memory (EEPROM). The clock speed of the board is 16 MHz.

The Arduino Uno Rev3 has a built-in LED on pin 13 and has a compact size, with dimensions of 68.6 mm in length and 53.4 mm in width. It is lightweight, weighing only 25 g.

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Arduino Uno Rev3 Pinouts

• Microcontroller: ATmega328P with 32KB flash memory, 2KB SRAM, 1KB EEPROM

• Operating Voltage: 5V

• Input Voltage Limits: 6-20V

• 14 Digital I/O Pins (6 can be used as PWM outputs)

• 6 Analog Input Pins

• DC Current per I/O Pin: 20 mA

• DC Current for 3.3V Pin: 50 mA

• Clock Speed: 16 MHz

• USB Connection: USB type B connector for programming and power

• Power Connector: 2.1mm center-positive plug

• ICSP Header: In-Circuit Serial Programming header for bootloader burning

• Reset Button: Reset push button to manually reset the microcontroller

• Power LED Indicator

• TX/RX LEDs: Serial communication indication LEDs

• Support for common shield form factors

  
  

• Arduino Uno Rev3 SMD

• Arduino Uno WiFi Rev2

Comparison between the Arduino Uno Rev3 and the Arduino Uno WiFi Rev2:

Please note that both boards have a USB connection, a power jack, an ICSP header, and a reset button. They also both support UART, I2C, and SPI communication protocols. The Arduino Uno WiFi Rev2 also includes an ECC608 crypto chip to ensure a secure and safe WiFi connection and an LSM6DS3TR IMU module that includes a 3D digital accelerometer & gyroscope for motion sensing.

• IoT and Smart Home Automation - The Uno can interface with various sensors and actuators to create smart home systems, remote weather stations, security systems, and more. Its wireless connectivity options allow it to transmit sensor data to the cloud.

• Robotics - With options to add motor shields and other actuators, the Uno can power simple autonomous robots, robotic arms, self-balancing robots, and more.

• Educational Tools - The Uno is commonly used to teach programming and electronics in schools and colleges because of its wide compatibility and ample documentation. Students can create interactive projects with LEDs, motors, sensors, etc.

• Industrial Automation and Control - The Uno can automate simple repetitive tasks, data logging, timing controls, liquid level alarms, and other automation devices when reliability and basic control is needed.

• Prototyping - The Uno is a great option for prototyping electronic circuits and products before developing printed circuit boards. This allows testing functionality and making iterations.

• Scientific Instrumentation - With its analog inputs, PWM outputs, and timed operations, the Uno can be used to build custom scientific instruments like oscilloscopes, spectrum analyzers, multi-sensors, etc.

• Teaching and Training Aids - The Uno is commonly used to build test platforms and rigs to demonstrate and teach concepts like PID control, signal processing, motor control algorithms, sensor interfacing, etc.

• Artistic Installations - With capabilities to control lights, motors, sensors, etc., the Uno can power interactive art installations based on input from people.

- Building a Basic Home Automation System with Arduino Uno Rev3

This tutorial will guide you on how to create a basic home automation system using an Arduino microcontroller development kit and a Bluetooth module. This will enable you to control devices from your smartphone. Home automation offers a new level of convenience, allowing you to control room lights with your smartphone or schedule events to happen automatically. Instead of using mechanical switches, you can control your home devices at your fingertips.

The main components of this project are an Arduino microcontroller kit, a Bluetooth wireless module, and a relay.

Materials Needed:

- Arduino UNO Rev3

- Relay module

- HC 05 Wireless Bluetooth Module

- Lamp

- 2.2k ohm resistor

- 1k ohm resistor

- Breadboard

- Jumper wires

Circuit Diagram

Once you have all the necessary components, you can refer to the circuit diagram for the correct wiring.

Image source: predictabledesigns

Connecting the Bluetooth HC-05 to the Arduino

1. Connect the Arduino’s +5V and GND pins to the bus strips on the breadboard.

2. Power the HC-05 module by connecting the 5V and GND pins to the bus strips on the breadboard.

3. Connect the TXD pin on the HC-05 module with the RXD pin (Pin 0) on the Arduino. This enables the HC-05 to send data to the Arduino.

4. Connect the TXD pin on the Arduino to the RXD pin on the HC-05. This completes the two-way communication, enabling the Arduino to send information to the HC-05.

Setting up the Relay Circuit

Next, connect the Arduino to a relay module to turn the connected device on and off. Connect the relay module in series with your electrical load.

Uploading the Code

Connect the Arduino through the USB port on your computer and open the Arduino IDE. Copy the provided sketch in a new window and run it on your Arduino.

#define RELAY_ON 0
#define RELAY_OFF 1
#define RELAY_1 4
char data = 0;
void setup() {
  // Set pin as output.
  pinMode(RELAY_1, OUTPUT);
  // Initialize relay one as off so that on reset it would be off by default
  digitalWrite(RELAY_1, RELAY_OFF);
  Serial.begin(9600);
  Serial.print("Type: 1 to turn on bulb. 0 to turn it off!");
}
void loop() {
  if (Serial.available() > 0) {
    data = Serial.read(); //Read the incoming data and store it into variable data
    Serial.print(data); //Print Value inside data in Serial monitor
    Serial.print("\n"); //New line
    if(data == '1'){
      digitalWrite(RELAY_1, RELAY_ON);
      Serial.println("Bulb is now turned ON.");
    }
    else if(data == '0'){
      digitalWrite(RELAY_1, RELAY_OFF);
      Serial.println("Bulb is now turned OFF.");
    }
  }
}

Controlling the bulb from your Android device

Download the Arduino Bluetooth Controller app on your Android device. Open the app and allow Bluetooth permissions. Select HC-05 from the list of available devices. Select "Switch" mode and set values for ON and OFF.

You can now control any device and turn it into a smart device that can be controlled from your smartphone. This setup can be expanded by using a multi-channel relay module. Although we used a Bluetooth app that controls a single load, you can use a more sophisticated Bluetooth control app or write your own custom Android app to control more devices.

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