Digispark ATtiny85 Black

Features:

1. Compact Design: Small form factor ideal for space-constrained projects.
2. Microcontroller: Based on the AVR ATtiny85 8-bit microcontroller.
3. Digital I/O: 6 digital I/O pins, with 4 capable of PWM output.
4. Analog Inputs: 4 analog input pins for sensor integration.
5. Memory: 512 bytes SRAM, 512 bytes EEPROM, 6KB user flash memory (from 8KB total, 2KB used by bootloader).
6. Clock Speed: 16.5 MHz for fast performance.
7. I2C and SPI Support: Compatible with I2C and SPI protocols.
8. Status Indicators: Power and status LEDs.
9. Power Supply: 7–12V input with onboard 5V regulation.
10. Regulated 5V Output: Onboard voltage regulator ensures stable 5V for peripherals.

Description:

The Digispark Black brings ATtiny85 functionality in a USB-ready form. It can be programmed via Arduino IDE using C/C++, despite the ATtiny85 lacking a native USB controller. Thanks to the V-USB library, the board emulates USB 1.1, enabling the creation of devices like HID keyboards or virtual serial ports. The board is ideal for applications needing minimal I/O but solid microcontroller capabilities.

Principle of Work:

• USB Bootloader: Enables direct USB connection without an external programmer.
• Code Uploading: The bootloader uses a virtual serial port for programming via Arduino IDE.
• Execution: Code runs from flash memory after a 5-second bootloader delay.

Pinout Diagram:

Pinout Functions:

Pin Descriptions:

• Digital I/O: 6 pins, 4 with PWM.
• Analog Inputs: 4 channels for analog sensors.
• AREF: Reference voltage for analog input range configuration.
• SDA/SCL: Used for I2C communication.
• USB: Built-in USB via V-USB software implementation.
• Onboard LED: Connected to pin 1 for debugging or status indication.
• Voltage Regulator: Converts 7–12V input to 5V regulated output.
• 5V Pin: Provides regulated 5V output for external components.
• Vin: External power input (7–12V DC).
• Power LED: Indicates board is powered on.

Applications:

1. DIY Electronics and Prototyping
2. Home Automation Systems
3. Internet of Things (IoT)
4. Wearable Devices
5. Robotics and Automation
6. Environmental Monitoring
7. Data Logging Projects
8. Educational Microcontroller Training

Getting Started:

1. Download and install the Arduino IDE.
2. Plug in the Digispark via USB.
3. Add URL to Additional Boards Manager: http://digistump.com/package_digistump_index.json
4. Install Digistump AVR boards via Boards Manager.
5. Install Windows drivers (use DPinst64.exe or DPinst.exe).
6. Select board: Digispark (Default - 16.5 MHz)
7. Upload code: Press upload, then plug in board when prompted.

Sample Code:

void setup() {
  pinMode(0, OUTPUT); // Set pin 0 as output
}

void loop() {
  digitalWrite(0, HIGH); // Turn on LED
  delay(1000);           // Wait 1 second
  digitalWrite(0, LOW);  // Turn off LED
  delay(1000);           // Wait 1 second
}

Technical Specifications:

• Microcontroller: ATtiny85
• Clock Speed: 16.5 MHz
• Operating Voltage: 5V
• Input Voltage (Recommended): 7–12V
• Digital I/O Pins: 6
• Rated Current per Pin: 20mA
• DC Current for 5V Pin: 500mA
• SRAM: 512 bytes
• EEPROM: 512 bytes
• Flash Memory: 8KB (6KB usable)
• Power Consumption: 300μA (active @1.8V), 0.1μA (power down)
• Operating Temp: -40°C to 105°C
• Board Size: 23 x 17.5mm

Resources:

• Arduino IDE Download
• Digispark Documentation