problems with usbtiny 2.0 from a kit.
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Please be positive and constructive with your questions and comments.
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Hi rick I did re-soldered the board. 're checked for cross soldering or bridges nothing . Still have 5.0 vts without the jumper. Any more thoughts ??
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Hi rick I did re-soldered the board. 're checked for cross soldering or bridges nothing . Still have 5.0 vts without the jumper. Any more thoughts ?? Thx.
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: problems with usbtiny 2.0 from a kit.
Are you sure you're testing the right pin?
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Yes. Positive 100% . I checked the pins before plug anything on it. 3 times also the isp plug has a little arrow for pin 1 . Cant miss that . Pin 2 is vc 5.0vts PIN 6 is ground . After remove the jumper I still have 5.0vts . Thx
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: problems with usbtiny 2.0 from a kit.
Well, if you look at the schematic, you'll see that there's absolutely no place for that to come from, unless your buffer chip is slagged. You are checking this with the target disconnected, right?
http://learn.adafruit.com/system/assets ... sp2sch.png
http://learn.adafruit.com/system/assets ... sp2sch.png
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Yes. I disconnected the target and placed a led on it when I disconnect the jumper the led stays on.I placed the led on pin 2 and 6 of the 6 pin isp cable.
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: problems with usbtiny 2.0 from a kit.
Well, I guess your buffer chip must be shorted out somehow. Please email [email protected] with a link to this thread for a replacement USBtinyISP kit.
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
HI RICK i just did . thanks for your help . you were very helpful.
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- Posts: 4
- Joined: Fri Feb 21, 2014 11:30 am
Re: problems with usbtiny 2.0 from a kit.
Hello, I have the same situation here, but if i remove the buffer chip I do not get the 5 volt with the jumper off, I will check with a new 74HAC125N chip, as you suggest that it may be in fault.
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Hi . Yes you might have a faulty buffer chip. Let me ask you did you recently purchased this unit?
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- Posts: 4
- Joined: Fri Feb 21, 2014 11:30 am
Re: problems with usbtiny 2.0 from a kit.
I have it since nearly a year, but the fact is the programmer is still working.
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
I'm just wondering if could be a bad batch of those ic.s.
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- Posts: 4
- Joined: Fri Feb 21, 2014 11:30 am
Re: problems with usbtiny 2.0 from a kit.
I replaced the buffer chip per a MC74F125N, everything it's ok now.
As soon as I get a 74AHC125N I will use it instead of the MC74F125N. The MC74F125N operate only at 5v, the 74AHC125N allow lower voltage, and so can be use as level shifter.
As soon as I get a 74AHC125N I will use it instead of the MC74F125N. The MC74F125N operate only at 5v, the 74AHC125N allow lower voltage, and so can be use as level shifter.
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- Posts: 19
- Joined: Sun Feb 16, 2014 1:33 pm
Re: problems with usbtiny 2.0 from a kit.
Ok. Cool. My situation is I just got this device and it came like that I just want it a factory working product if I had it for a long time it will be ok. Best luck . And thx.
Please be positive and constructive with your questions and comments.