Arduino micro connected to 8x8 led matrix backpack

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adafruit_support_rick
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by adafruit_support_rick »

You don't have to change anything.

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yousefsahebj
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by yousefsahebj »

I tried using a signal line in ( rca or Aux ) connected ground to ground and positive to A0 , results were strange. How would you go about solving this problem ?

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yousefsahebj
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by yousefsahebj »

By strange meaning , whenever i touched the speaker wires , i got results . i connected the arduino to the rca signal going into the amplifier , and when i touched the wires coming out of the amplifier , it showed partially random things. Im guessing my hand was some sort of connection between the wires.

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pburgess
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by pburgess »

Line-in is mostly a hardware problem, not software. You'll need some additional components to handle the DC offset difference between the audio source and Arduino.

Found a simple example one here:
https://github.com/fadookie/Triggerboy/wiki/Hardware
Just need a couple changes to apply this to your project:
- Connect to analog pin 0 instead of pin 3 as they show
- Connect to +3.3V instead of +5V

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yousefsahebj
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by yousefsahebj »

Thank you everyone for all the help, i got the parts and i will attempt to assemble. i will let you know how it goes !!

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yousefsahebj
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by yousefsahebj »

Hello,

No results :( i built the circuit and did not work . any suggestions ? very hard to post pictures that make sense .


hope the pictures help, i tried to draw what i did on one of the pictures
Attachments
WP_20141030_23_51_31_Pro.jpg
WP_20141030_23_51_31_Pro.jpg (323.33 KiB) Viewed 258 times
WP_20141030_23_51_22_Pro.jpg
WP_20141030_23_51_22_Pro.jpg (251.15 KiB) Viewed 258 times
modifier.jpg
modifier.jpg (253.05 KiB) Viewed 258 times

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yousefsahebj
 
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Re: Arduino micro connected to 8x8 led matrix backpack

Post by yousefsahebj »

UPDATE :

After playing around with it for a while, somehow it worked.

What changed : i connected the lines from the offset ( AUX in) to an amplifier boards channel inputs. Specifically the adafruit 20watt amplifier board. My guess is the signal is some how boosted ? maybe.

Overall i did not touch the DC offset circuit , and tried a lot of different things. Im happy its working however, thanks to all the great people who helped me along the way.


Only thing that is still a tad bit annoying is the fact that the volume has to be fully cranked up for any good visual results. Is there a possible way around that ? maybe change the values in the software or modify the circuit?

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