Arduino based general purpose programmer for ATtinys (UPDI) and ISP

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A friend and I have just completed a personal hardware development project for AVRgpp - a general purpose programmer which, at the moment, supports ISP and UPDI programming along with a USB to serial interface.

Yes, there are ISP programmers out there, and lots of USB to serial interfaces, but we wanted to do our own thing (!) and integrate the lot along with UPDI programming for the latest generation of ATtiny processors supported by megaTinyCore.

AVRgpp options and settings are selected via an OLED and two button interface which, if required, may be used to select 5V or 3.3V power to the target (within USB limits).  It is also possible to select a 12V pulse to be sent to the target prior to UPDI programming.

AVRgpp measures 28mm x 60mm, it is based on an ATmega328P, it is totally compatible with the Arduino IDE and it communicates with AVRDUDE for programming.  Firmware is based on the ArduinoISP and jtag2updi software.

AVRgpp is open source and full details, along with files available may be found on the AVRgpp web page:

If there was sufficient demand (say 100 plus units) we would be happy to fix a price and arrange manufacture of bare PCBs, partially built-up PCBs (all the surface mount stuff laid down) or fully populated units - with or without a laser-cut acrylic enclosure!

On the other hand, AVRgpp is open source so someone else may like to have a go at making some money by manufacturing systems for sale.

We welcome comments and suggestions - preferably via the contact email address on the web page.


This photo shows a fully populated PCB.

 AVRgpp full populated PCB


This photo show AVRgpp programming at ATtiny1614.  AVRgpp is also providing 5V Vcc - as shown by the tell-tale LED.


Using AVRgpp to program an ATtiny1614 over UPDI


A laser cut acrylic enclosure for AVRgpp.


A laser cut acrylic enclosure for AVRgpp

Last Edited: Tue. Jun 16, 2020 - 04:39 PM