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Author Topic: stk500_recv() Error w/Uno on a Mac  (Read 1192 times)
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Hello,

I recently started getting a "avrdude: stk500_recv(): programmer is not responding" error when I try to upload anything to my Uno from an iMac (10.6.6). The setup worked fine until I tried to use an analog reference voltage of 12v. I'm pretty sure I did everything right for the aref, but I assumed the ATmega328 had been fried, anyway, so I bought a new one. Installed the new chip last night, but I'm still getting the same error.

This is what Arduino tells me when I try to upload:
Binary sketch size: 1426 bytes (of a 32256 byte maximum)
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding

I have a Mac w/10.6.6, and an Uno board.

Thanks for any help or advice!

Sam

P.S. I tried looking through the troubleshooting page (which actually has *very* little useful information on it about really anything...) and searching the forums for similar problems. I found one that I thought was close, but they suggested I start my own thread, so here it is!
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I got this message with my arduino BT card. What I needed to do was to press the reset-button right before I press the upload-button. Maybe it helps?

I assumes that you have selected the correct COM-port?
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The error is a generic error and there are probably thousands of pages (and old-forum posts) that give ideas on what to do.

The two most common issues appear to be:  1) Something wrong with the USB-Serial Interface or 2) Auto-Reset not working.

If you damaged the 8u2 on the Uno, it may not be able to communicate with the computer any more.  The first step is trying the manual-reset already mentioned.

As for applying 12V to AREF, you probably shouldn't.  The reference (nor the ADCs inputs) are not rated for anything over ~5V.
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Did you put a bootloader on the new 328?  It is possible that the 8U2 is dead too.
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Thanks for all the suggestions!

Yeah, I've tried manual reset already, to no avail.

The chip said it came preloaded with the bootloader (from Sparkfun), but I got the same error when I tried to write the bootloader to the chip, anyway.

I'm selecting the same COM ports and have the same settings on my computer as I did when the communication worked, so I don't think that's the issue.

I thought I read that you could use pretty much any aref voltage as long as you told the board you were going to beforehand. Maybe I missed where the max is 5v. I thought using an external reference was for if you needed a reference *above* 5, but maybe it's just if you need it *other* than 5...

I don't know what the 8U2 is, but it sounds like that's probably what I fried, then. I'm guessing this means I'lll just need to get a whole new board?

Thanks again,

Sam
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Quote
Maybe I missed where the max is 5v.
The Atmega328 Datasheet clearly says that all I/O pins have a Max Voltage of VCC+0.5v.  The Arduino documentation could probably be clearer on this point.  You are right, the reason for ARef is for anything other than the internal 1.1V or VCC as the reference.

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I don't know what the 8U2 is, but it sounds like that's probably what I fried, then. I'm guessing this means I'lll just need to get a whole new board?
The 8U2 is the other microprocessor on the Uno.  It is the surface mount component near the USB port.  It handles the USB/Serial communication between the PC and the ATmega328.  Unless you can do the rework yourself, you'll need to purchase another Uno.
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Well.. Just as a suggestion (and to ensure your old and new chip is not completely fried) try wiring it in a breadboard and communicating with it if you have an avr programmer.

Here is a site that shows you exactly how you can do so:
http://itp.nyu.edu/physcomp/Tutorials/ArduinoBreadboard

And yes there are a few tutorials here, but this one is more visual(to me anyways).
Heck if both chips work, buy a few boards from radio shack, two usb to serial chips, 5v(or 3.3v) regulators, a few capacitors and resistors, and two reset buttons, and you have efficiently multiplied one dead arduino for two good ones smiley
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I added some more explicit notes to the analogReference() page and Uno documentations about the voltage range for the AREF pin.
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