Arduino Uno R4 WiFi: Description, Features and applications

The Arduino Uno R4 WiFi represents an evolution of the classic Uno, upgrading the microcontroller to a 32-bit Arm chip and adding built-in WiFi/Bluetooth connectivity. At its core is the Renesas R7FA4M1AB3CFM#AA0 microcontroller, containing a 48MHz Arm Cortex-M4 processor with floating point unit, 256KB flash, 32KB SRAM, and 8KB EEPROM. This is augmented by an ESP32-S3 WiFi/BT module.

Key Specifications of Renesas R7FA4M1AB3CFM#AA0 microcontroller:

The board layout matches the Uno, with the same iconic pinout and form factor that provides compatibility with many existing shields. There are 14 digital GPIO pins, 6 analog inputs, hardware serial, I2C and SPI connections via headers, and a USB-C port for power and programming. Power can come from USB or the DC jack and is regulated down to 5V and 3.3V.

A distinguishing feature of the Uno R4 WiFi is the inclusion of a 12x8 red LED matrix, connected using charlieplexing. This matrix can be used to display text, graphics, and animations programmatically within sketches. The ESP32-S3 module handles WiFi networking capabilities, providing WiFi 4 (802.11 b/g/n) and Bluetooth 5 connectivity without requiring any WiFi coding within sketches.

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• Microcontroller: Renesas R7FA4M1AB3CFM#AA0 (Arm Cortex-M4)

• WiFi Module: ESP32-S3-MINI-1-N8

• Operating Voltage: 5V logic

• 14 Digital I/O Pins

• 6 Analog Input Pins

• USB-C connector

• On-board 12x8 LED matrix

• Headers for I2C, SPI, UART

• IoT projects with wireless connectivity

• Building Internet-connected sensors/devices

• Projects involving animation or graphics on the LED matrix

• Educational courses using WiFi features

• Home automation systems with wireless remote access

• DIY weather stations that upload data to the cloud

• Voice-controlled applications using WiFi and audio

1. Arduino MKR WiFi 1010: This board provides a practical and cost-effective solution to add Wi-Fi connectivity to projects with minimal previous experience.

2. ESP32: This is a series of low-cost, low-power systems on a chip microcontroller with integrated Wi-Fi and dual-mode Bluetooth.

3. NodeMCU: An open-source firmware and development kit that helps you to prototype your IoT product within a few Lua script lines.

4. Particle Photon: A tiny Wi-Fi development kit for creating connected projects and products for the Internet of Things.

5. Adafruit Feather HUZZAH with ESP8266: A Wi-Fi development board with built-in USB and battery charging.

Smart Home Automation using Arduino Uno R4 WiFi and Arduino IoT Cloud

Home automation is an exciting field that allows you to control various devices in your home remotely. In this tutorial, we will create a home automation system using an Arduino Uno R4 WiFi and the Arduino IoT Cloud.

Components

1. Arduino Uno R4 WiFi

2. Resistors

3. LEDs

4. MOSFETs

5. Breadboard

6. Jumper Wires

Circuit Design

Connect the voltage input (9V battery or 12V DC adapter) to a 7805 voltage regulator. This will convert the Vin to a steady 5V DC Supply. Connect this to multiple devices.

Two MOSFETs are configured as switches and connected to pin 8 and pin 9 of Arduino. Using pin 8 and pin 9, we can turn these MOSFETs on and off. Electronic devices can be connected to the terminal blocks connected to each MOSFET.

Additional terminal blocks are connected to pins 10, 11, 12, and 13 of Arduino. You can connect any device with an operating voltage of 5V here. You can also connect a 5-volt relay at these points to control AC devices.

Programming with Arduino IoT Cloud

In the Arduino IoT Cloud, create four Cloud variables – device1, device2, device3, and device4. These are linked to the Arduino Uno R4 and will control the four devices.

#includevoid setup() {
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  if (device1) {
    digitalWrite(10, HIGH);
  } else {
    digitalWrite(10, LOW);
  }

  if (device2) {
    digitalWrite(11, HIGH);
  } else {
    digitalWrite(11, LOW);
  }

  if (device3) {
    digitalWrite(12, HIGH);
  } else {
    digitalWrite(12, LOW);
  }

  if (device4) {
    digitalWrite(13, HIGH);
  } else {
    digitalWrite(13, LOW);
  }
}

This code checks for changes in the variables and turns the corresponding LED on or off.

View Source Code and Source project.

Testing

After uploading the code, open the Arduino IoT Cloud dashboard and try to turn the switches on and off. You should be able to control all four LEDs. You can also control the devices using the Arduino IoT Cloud mobile application.

This project demonstrates how you can use the Arduino Uno R4 WiFi and the Arduino IoT Cloud to create a simple but effective home automation system.

SCHEMATICS IN .PDFDATASHEET IN .PDF

Resources for the Arduino Uno R4 WiFi: