Linxduino Uno R3 Development Board

Overview

Linxduino Uno R3 Development Board featuring the ATmega328P microcontroller — an improved and enhanced version of the classic Arduino Uno R3. Designed for electronics learning, prototyping, embedded systems development, robotics, IoT projects, and automation. Features conventional Arduino-compatible interfaces, standard pinout, and comes complete with USB cable. Fully compatible with the Arduino IDE and all Arduino libraries and shields.

Specifications

Parameter	Value
Model	Linxduino Uno R3 (P Version)
Microcontroller	ATmega328P
Operating Voltage	5V
Input Voltage	7V – 12V (recommended)
Input Voltage (limit)	6V – 20V
Clock Speed	16MHz
Flash Memory	32KB (0.5KB bootloader)
SRAM	2KB
EEPROM	1KB
Digital I/O Pins	14 (6 PWM capable)
Analog Input Pins	6 (A0–A5)
PWM Pins	6 (pins 3,5,6,9,10,11)
DC Current per I/O Pin	40mA
DC Current for 3.3V Pin	50mA
USB Interface	USB Type-B
Communication	UART, SPI, I2C
Dimensions	68.6mm x 53.4mm
Weight	~25g

Pin Configuration

Interface	Pins
Digital I/O	D0 – D13
Analog Input	A0 – A5
PWM Output	D3, D5, D6, D9, D10, D11
UART	D0 (RX), D1 (TX)
SPI	D10 (SS), D11 (MOSI), D12 (MISO), D13 (SCK)
I2C	A4 (SDA), A5 (SCL)
Power	5V, 3.3V, GND, VIN
External Interrupt	D2, D3
Reset	RST pin + Reset button

Features

• ATmega328P microcontroller — industry standard MCU
• Improved P version — enhanced components and build quality
• Arduino Uno R3 compatible — works with all Arduino shields
• USB powered — program and power via USB
• Auto-reset circuit — seamless programming via Arduino IDE
• ICSP header — in-circuit serial programming support
• 3.3V and 5V power outputs — power external sensors and modules
• Onboard LED — built-in LED on pin 13 for testing
• Power LED indicator — visual power status
• TX/RX LEDs — serial communication indicators
• Barrel jack — 7-12V external power input
• Complete with USB cable — ready to use out of the box
• Breadboard friendly layout — standard 2.54mm pin spacing

Improvements Over Standard Arduino Uno

Feature	Standard Uno	Linxduino Uno R3
Components	Standard	Improved quality
USB Chip	ATmega16U2	CH340/Improved
Build Quality	Standard	Enhanced
Cable Included	No	Yes (USB cable)
Compatibility	Arduino	Full Arduino compatible

Getting Started

1. Install Arduino IDE from https://arduino.cc
2. Connect board via USB cable
3. Select Tools → Board → Arduino Uno
4. Select correct COM port
5. Open File → Examples → Basics → Blink
6. Click Upload — onboard LED blinks!

First Program (Blink)

void setup() {
  pinMode(13, OUTPUT); // Built-in LED
}

void loop() {
  digitalWrite(13, HIGH); // LED ON
  delay(1000);
  digitalWrite(13, LOW);  // LED OFF
  delay(1000);
}

Reading Analog Sensor

void setup() {
  Serial.begin(9600);
}

void loop() {
  int value = analogRead(A0); // Read sensor
  float voltage = value * (5.0 / 1023.0);
  Serial.println(voltage);
  delay(500);
}

Compatible Modules & Shields

• DHT11/DHT22 temperature sensor
• HC-SR04 ultrasonic sensor
• L298N motor driver shield
• Relay modules (5V)
• LCD display (I2C)
• NRF24L01 wireless module
• SIM800L GSM module
• Servo motors
• Stepper motor drivers
• SD card modules
• Ethernet shield
• WiFi shield (ESP8266)

⚠️ Notes

• Do NOT exceed 40mA per I/O pin
• Do NOT exceed 200mA total from all I/O pins
• Use external power supply for motors and high-current loads
• Analog pins can be used as digital I/O (A0=D14, A1=D15, etc.)
• Pin 0 and 1 are UART — avoid using during Serial communication
• Add flyback diode when driving relay or motor coils

Applications

• Electronics learning and education
• Sensor interfacing and data logging
• Robot control and automation
• LED and display projects
• Home automation prototyping
• Motor and servo control
• IoT prototyping with WiFi/BT shields
• School and university projects
• Arduino shield testing
• Rapid prototyping