![]() It can supply 5V or 3.3V power to the target and supports 5V/3.3V signal levels on the SPI pins. This USBtinyISP-compatible AVR programmer uses a cheap ATTiny85 board from It's just handy to have a simple programmer ready for the job. While you can wire up a spare Pro Mini, upload the ArduinoISP sketch, and burn the bootloader into a target You can also upload your sketch directly without a bootloader thus making an extra 2KB ![]() Having a standalone programmer is very useful when you need to burn a bootloader into eg. The USBtinyISP, available from Adafruit, is a popular open-source USB programmer which uses the SPI interface to program Atmel AVR chips like
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