¶ Digispark
This is relevant for ATTiny85 chips in this configuration
We bought these cheap amazon digispark boards:
https://www.amazon.com/gp/product/B07FCHFB85/ref=ox_sc_act_title_1?smid=AYZI0TO4JGBW9&psc=1
They come without bootloader. They must be manually programmed with a bootloader.
Use the bootloader micronucleus:
https://github.com/micronucleus/micronucleus
Use version v1.11, all other versions don't work
It must be flashed with an external AVR ISP
Connect to your ISP like this:
¶ ISP -> Digispark
VTG -> VIN
GND -> GND
MOSI -> MOSI
MISO -> MISO
SCLK -> SCLK
RST -> RESET (PB5)
We use this AVR programmer:
Connect accordingly
Use avrdude to flash
make CONFIG=t85_default flash
avrdude -c avrisp -P /dev/ttyUSB0 -p attiny85 -U flash:w:main.hex:i -B 10
In Arduino IDE 2.0, search for a module with digispark and install it. In board, select "Digispark 16MHz"
¶ Examples
To check that the digispark is working properly, we can use two examples.
In the Arduino examples folder, look for a file named Blink.