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Pro Trinket Bootloader Problem
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Please be positive and constructive with your questions and comments.

Pro Trinket Bootloader Problem

by WillDriessen on Sun Apr 19, 2015 5:08 pm

Hello-
I just bought a 5V 16MHz Pro Trinket and I was very excited. So I unpackaged it, downloaded the correct IDE, changed the board and programmer settings(Pro Trinket 5V USB, USBtinyISP). Everything seemed to be in order, then I grabbed a proven correct Micro-Usb cable and plugged in my Pro Trinket(I have a Macbook OSX 10.6.8 with the 1.0.5 IDE). When I plugged in the trinket and pressed the bootloader button, instead of the nice pulsing bootloader LED I was expecting, I got a green power LED and a red LED blinking twice then off for a second on a loop. Then I tried pressing the button and uploading the basic Blink code but I got the error- avrdude: Error: Could not find USBtiny device (0x1781/0xc9f)[/color]. So then I tried using a new port, a new cord, a powered USB 2.0 hub, and nothing seems to be working. I am very lost and don't know what to do. I don't know if it is my computer or if I just missed something.

Thanks for all the help in advance, it means a lot.

~~Will

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Re: Pro Trinket Bootloader Problem

by jchaltinner on Sun Apr 19, 2015 9:40 pm

Exact same thing is currently happening to me. Trinket Pro 5v out of the box today. Instead of a pulse, it is a triple flash (very fast, had to use iPhone slow-mo to count the flashes), without about a 1 second pause. Reset has no effect, nor does adding a usb hub, I even "successfully" reprogrammed the bootloader per adafruit instructions, and no change. Help please!

Thanks,
JC

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Re: Pro Trinket Bootloader Problem

by adafruit_support_rick on Mon Apr 20, 2015 7:33 am

You can both email support@adafruit.com with a link to this thread for a replacement Pro Trinket

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Re: Pro Trinket Bootloader Problem

by WillDriessen on Mon Apr 20, 2015 9:35 am

Will we need to ship back our old ones?

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Re: Pro Trinket Bootloader Problem

by WillDriessen on Mon Apr 20, 2015 9:39 am

Also, does soldering void warranty of a device from adafruit?

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Re: Pro Trinket Bootloader Problem

by adafruit2 on Mon Apr 20, 2015 10:23 am

nope!
try another thing, this might be a 'noisy' RX pin
https://learn.adafruit.com/introducing- ... /faq#faq-4
try connecting a ~10K resistor from RX to the 3V or 5V pin

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Re: Pro Trinket Bootloader Problem

by WillDriessen on Tue Apr 21, 2015 9:18 am

Thanks for the help, but that didn't work for me. So I am going to just order another. By the way, are all devices from adafruit tested before they leave the factory?

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Re: Pro Trinket Bootloader Problem

by adafruit_support_rick on Tue Apr 21, 2015 11:55 am

We'll replace it. Please email support@adafruit.com with a link to this thread for a replacement

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Re: Pro Trinket Bootloader Problem

by daveonet on Sun Dec 13, 2015 12:32 pm

I was having intermittent issues after pressing the reset button. Sometimes it would take two or three attempts to get into bootloader mode.

The resistor trick fixed it! Works perfect every time now :)

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Re: Pro Trinket Bootloader Problem

by Francisko77 on Fri May 12, 2017 4:09 pm

adafruit_support_rick wrote:We'll replace it. Please email support@adafruit.com with a link to this thread for a replacement


I'm with the same issue in a Pro Trinket it is stuck in boot mode with a group of 3 rapid flashes stopped by a one long flash, what should I do?

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Re: Pro Trinket Bootloader Problem

by adafruit_support_rick on Sat May 13, 2017 7:58 am

That sounds like a problem with USB communications. Make sure you are not using a charge only USB cable. Try some different USB cables and usb ports on your computer. Also, try connecting through a USB 2.0 hub.

What kind of computer are you using?

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Re: Pro Trinket Bootloader Problem

by Francisko77 on Tue May 16, 2017 6:42 am

I'm using a Mac With a Hub 2.0 and a cable already tested with a mini Metro.

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Re: Pro Trinket Bootloader Problem

by adafruit_support_rick on Tue May 16, 2017 9:49 am

Hmmm...

Do you have some other USB ports on your Mac? If so, try those.

If it still doesn't work, Please email support@adafruit.com with a link to this post for a replacement Pro Trinket.

I kind of don't think that this is a problem with the Pro Trinket, so a replacement may not make any difference, but let's try it anyway. Some computers just have a problem with Pro Trinkets. If you have another computer, you might try it there...

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Please be positive and constructive with your questions and comments.