How to install Attiny85 Digispark board driver in windows OS and use in Arduino IDE - YouTube
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Amazon.com: AITRIP 5Pcs Digispark Attiny85 Micro Miniature Microcontroller USB Development Board Module Compatible with Arduino IDE 1.0+ (OSX/Win/Linux) : Electronics
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Digispark ATTiny85 dev board not completing upload [Run error -1] : r/attiny
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ivoras' electronics stuff — Pros and cons of Digispark (mostly cons)