Hi,
I have issues with 8x8 led matrix. They are just not displaying correctly.
The three matrixes in the image are running on the same code( example code, matrix8x8).
I made sure the address is right. One is 0x75 and one is 0x72.(As you can see in the image).
This happened to me before when I made another purchase and got the broken matrix replace.
Did I do something wrong or these matrixes are actually broken? Please help!
Led Matrix Doesn't display correctly
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Please be positive and constructive with your questions and comments.
- Franklin97355
- Posts: 23940
- Joined: Mon Apr 21, 2008 2:33 pm
Re: Led Matrix Doesn't display correctly
If you disconnect the last matrix what happens?
- yishi
- Posts: 16
- Joined: Fri Jan 31, 2014 12:10 am
Re: Led Matrix Doesn't display correctly
Nothing changed.
- Franklin97355
- Posts: 23940
- Joined: Mon Apr 21, 2008 2:33 pm
Re: Led Matrix Doesn't display correctly
One last test. Try moving one of the bad ones to a different spot on the breadboard (probably won't help but try anyway) If that doesn't help email [email protected] with a link to this thread for replacements.
- yishi
- Posts: 16
- Joined: Fri Jan 31, 2014 12:10 am
Re: Led Matrix Doesn't display correctly
Thank you! I tried switch positions and still nothing changed. I will send email for replacement.
- hiduino
- Posts: 862
- Joined: Sat Sep 01, 2012 7:05 pm
Re: Led Matrix Doesn't display correctly
It looks like those two matrix are soldered backwards. If you hold up the matrix with the headers to the left the the lettering on the side of the matrix should be facing down. If they are facing up then they are backwards.
- yishi
- Posts: 16
- Joined: Fri Jan 31, 2014 12:10 am
Re: Led Matrix Doesn't display correctly
Thank you hiduino! I think it is very likely the reason. However, it is very hard to desolder the chip now with solder iron. I ordered a heat gun, hope it can work.
- Franklin97355
- Posts: 23940
- Joined: Mon Apr 21, 2008 2:33 pm
Re: Led Matrix Doesn't display correctly
I've used chip quik in the past with fair to good results http://www.chipquik.com/store/ but it does not hold up to getting a new tool ;)
- yishi
- Posts: 16
- Joined: Fri Jan 31, 2014 12:10 am
Re: Led Matrix Doesn't display correctly
Thank you franklin97355 and hiduino! I figured out the cause is I soldered the matrix backward. Now they are all working fine! Takes me one week to get all my tools though, heat gun really helps, lol.
Please be positive and constructive with your questions and comments.