University Gemma Project - Issues with USBtiny device and avrdude

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drjenah
 
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Joined: Mon Nov 14, 2022 3:29 pm

University Gemma Project - Issues with USBtiny device and avrdude

Post by drjenah »

Currently, I have around 25 teams using the Adafruit GEMMA v2 (purchased within the last year). We have followed the instructions from the Adafruit GEMMA website with some assistance from our tech department. I'm able to program the GEMMA using Windows 10, Arduino 1.8.13, Adafruit GEMMA Instructions (https://learn.adafruit.com/introducing- ... bootloader) regarding setting up the Windows Driver and Arduino IDE, and https://github.com/mariusgreuel/avrdude/releases - The Windows avrdude files from this link in my C drive. Unfortunately, this is not working for newer versions of Arduino and many of my students are getting the error - avrdude: Error: Could not find USBtiny device.This course is a general engineering course, and I want to expose the students to projects from Adafruit. My background is in environmental engineering, and we do a water filtration project, but I want to learn more about how to assist the students with programming the GEMMAS. Unfortunately, I'm not finding much information regarding avrdude, and I'm not sure if I should be directing the students towards WinAVR. The GEMMAs work when I program them on my computer with the older version of Arduino, but not with a newer version.

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 avrdude: Error: Could not find USBtiny device

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mikeysklar
 
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Re: University Gemma Project - Issues with USBtiny device and avrdude

Post by mikeysklar »

This should help. It might be necessary to use an older release of the Arduino IDE, but try this first with 1.8.19 (currently 1.x stable):
If you get the error message avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)

That means the bootloader wasn't active. Make sure to press the button on the Gemma to activate the bootloader before clicking the Upload button.
https://learn.adafruit.com/introducing- ... 9f-1415983

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