Digispark

The Digispark is an Attiny85 based microcontroller development board similar to the Arduino line, perfect for when an Arduino is too big. The

Specification

• Attiny85
• Power via USB or External Source (regulated 5v or 7-35v, 12v or less recommended with automatic selection)
• On-board 500ma 5V Regulator
• Built-in USB
• 6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB)
• 8k Flash Memory (about 6k after bootloader)
• I2C and SPI (vis USI)
• PWM on 3 pins (more possible with Software PWM)
• ADC on 4 pins
• Power LED and Test/Status LED

Installation

Arduino IDE 1.6.5 or newer is needed (I tried it on version 1.6.7).

1. Go to "File -> Preferences" and in the field "Additional Boards Manager URLs" introduce http://digistump.com/package_digistump_index.json and click OK.
2. Then go to "Tools -> Boards -> Boards Manager" and in the box "Type" select “Contributed”. Select the “Digistump AVR Boards” package and click the “Install” button.
3. If you are using GNU/Linux you might need to add the rules for the USB programming device.
4. Now you can select the board for developing from "Tools -> Boards", most probably the device you have is “Digispark (Default - 16.5mhz)”.

Linux Rules

If you are running GNU/Linux and getting errors on upload or other strange results you might need to add the USB device to udev. You must place the udev rules below into a file named /etc/udev/rules.d/49-micronucleus.rules

Create the /etc/udev/rules.d/49-micronucleus.rules files with this content (setting up the correct permissions for user and group if desired):

# UDEV Rules for Micronucleus boards including the Digispark.
# This file must be placed at:
#
# /etc/udev/rules.d/49-micronucleus.rules    (preferred location)
#   or
# /lib/udev/rules.d/49-micronucleus.rules    (req'd on some broken systems)
#
# After this file is copied, physically unplug and reconnect the board.
#
SUBSYSTEMS=="usb", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="0753", MODE:="0666"
KERNEL=="ttyACM*", ATTRS{idVendor}=="16d0", ATTRS{idProduct}=="0753", MODE:="0666", ENV{ID_MM_DEVICE_IGNORE}="1"
#
# If you share your linux system with other users, or just don't like the
# idea of write permission for everybody, you can replace MODE:="0666" with
# OWNER:="yourusername" to create the device owned by you, or with
# GROUP:="somegroupname" and mange access using standard unix groups.

Then restart the system or run this command to apply the rules:

udevadm control --reload-rules