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Digispark ATtiny85 USB REV3

Digispark ATtiny85 USB REV3

The Digispark ATtiny85 USB REV3 is a compact development board based on the ATtiny85 microcontroller. It features USB connectivity, making it ideal for embedded projects with limited space. Despite its small size, it offers sufficient memory and I/O capabilities to support a wide range of applications. Compatible with the Arduino IDE, it offers an accessible development environment for beginners and advanced users alike.

Package Includes:

  • 1 x Digispark ATtiny85 USB REV3

23.00 AED 23.00 AED Tax Included
23.00 AED Tax Included

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Features:

  1. ATtiny85 Microcontroller: 8KB flash memory, 512 bytes SRAM.
  2. USB Connectivity: Built-in USB interface eliminates the need for external programmers.
  3. Arduino Compatibility: Fully compatible with the Arduino IDE, supporting a wide range of libraries.
  4. I/O Pins: 6 general-purpose I/O pins for digital or analog use.
  5. Power Options: Powered via USB with a built-in voltage regulator (supports 5V–16V).
  6. Compact Size: Ideal for projects with space constraints.
  7. Low Cost: Budget-friendly for students, hobbyists, and professionals.
  8. Programmable: Easily programmable with the Arduino IDE and supported libraries.
  9. Standalone Operation: Operates independently without additional components.
  10. Open-Source: Design and schematics are open-source for customization.

Description:

The Digispark ATtiny85 USB REV3 is a compact development board based on the ATtiny85 microcontroller. It provides an affordable and flexible platform for USB-enabled embedded projects. Featuring 8KB of flash memory, 512 bytes of SRAM, and 6 I/O pins, it supports both digital and analog interfacing. With USB connectivity, Arduino IDE compatibility, and no need for an external power supply, it is perfect for a wide variety of small-scale and space-constrained applications.

Principle of Work:

  1. Microcontroller Operation: Runs user programs on the ATtiny85, utilizing flash and SRAM.
  2. USB Communication: Facilitates programming and device emulation via built-in USB.
  3. Programming: Uses Arduino IDE for code writing, compiling, and uploading over USB.
  4. Input/Output: 6 configurable I/O pins for digital/analog interfacing.
  5. Power Supply: Powered through USB; includes voltage regulator for 7–12V input.
  6. Arduino Compatibility: Seamlessly integrates into the Arduino ecosystem.

Pinout of the Module:

Digispark R3 Pinout
  • P0: I2C SDA, PWM (onboard LED in older revisions)
  • P1: PWM (onboard LED in Rev 2/3/4)
  • P2: I2C SCK, analog input
  • P3: Analog input, USB+
  • P4: PWM, analog input, USB
  • P5: Analog input, outputs 3V when HIGH

Other Pin Functions:

  • Digital I/O: 6 pins (4 PWM capable), use with pinMode(), digitalWrite(), digitalRead()
  • Analog Pins: 4 analog inputs
  • GND: Ground
  • AREF: Reference voltage for analog inputs (0–5V)
  • SDA/SCL: I2C communication pins
  • USB Connection: Emulated USB via V-USB library; requires driver
  • On-Board LED: Connected to digital pin 0 (P0)
  • Voltage Regulator: Converts 7–12V DC to 5V regulated output
  • 5V Pin: Provides regulated 5V output
  • Vin Pin: External power input (7–12V)
  • Power LED Indicator: Shows board power status

Applications:

  • Prototyping and DIY electronics projects
  • Home automation systems
  • Internet of Things (IoT)
  • Small-scale robotics control
  • Wearable electronics
  • Educational programming and electronics courses
  • Interactive art installations
  • Sensor data logging

Circuit:

No external circuit required for basic testing. The built-in LED on pin P0 is used.

Library and Setup:

  1. Open Arduino IDE (download if needed).
  2. Connect the board to your computer via USB.
  3. Add Boards Manager URL:
    • Go to File → Preferences → Additional Boards Manager URLs.
    • Add: http://digistump.com/package_digistump_index.json
  4. Install Board Support:
    • Go to Tools → Board → Boards Manager.
    • Search for “Digistump AVR Boards” and click Install.
  5. Install Windows Drivers:
    • Download from: digistump.com
    • Extract ZIP and run DPinst64.exe (64-bit) or DPinst.exe (32-bit)
    • Approve any unsigned driver installation prompts
  6. Select Board:
    • Tools → Board → Digispark (Default - 16.5mhz)
  7. Upload Code:
    • Click upload in Arduino IDE.
    • Wait for prompt to plug in board, then insert it.
    • Code will upload and start automatically.

Sample Code:

// Pin declaration
const int LED_PIN = 0; // Pin P0

void setup() {
  pinMode(LED_PIN, OUTPUT); // Set LED_PIN as output
}

void loop() {
  digitalWrite(LED_PIN, HIGH); // Turn on LED
  delay(1000);                 // Wait 1 second
  digitalWrite(LED_PIN, LOW);  // Turn off LED
  delay(1000);                 // Wait 1 second
}

How the Code Works:

  1. Declares pin P0 as the LED pin.
  2. Sets the pin as OUTPUT in setup().
  3. Turns LED on, delays 1s, then turns off and delays again inside loop().

Technical Details:

  • Microcontroller: ATtiny85
  • Clock Speed: 16.5 MHz
  • Operating Voltage: 5V
  • DC Current on 5V Pin: 500mA
  • Input Voltage (Recommended): 7V – 12V
  • Output Voltage: 5V
  • Digital I/O Pins: 6
  • PWM Pins: 4
  • Analog Input Pins: 4