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LED Backpack issues
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

LED Backpack issues

by jshart22 on Thu May 06, 2021 6:48 pm

I bought a couple of the 1.2" led backpack displays and am trying to get them working on an Arduino Uno using the I2C serial comm. In short they are not as described and the examples don't work. Examining the boards into which the LED displays are plugged, they are not as pictured in the docs.

After installing various test sketches, they run, but produce just some unpredictable displays. I've updated all the libraries to no avail. It's as though these are new devices and the libraries are not compatible. They are nice, big and bright though. Any help here? Thanks...

jshart22
 
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Re: LED Backpack issues

by adafruit_support_bill on Thu May 06, 2021 6:50 pm

Please post some photos showing your soldering and connections.

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Re: LED Backpack issues

by jshart22 on Thu May 06, 2021 6:51 pm

Oh, and there are no jumpers on these boards to solder and set the hex address... So I can't even tell what the correct address is.

jshart22
 
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Re: LED Backpack issues

by adafruit_support_bill on Thu May 06, 2021 7:05 pm

The jumper pads are on the back of the board next to the HT16K33 chip. If you post some photos showing your soldering and connections we can try to diagnose the problems you are seeing.

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Re: LED Backpack issues

by jshart22 on Thu May 06, 2021 7:08 pm

These came pre-soldered. But I'll take a picture...
led1.jpg
led1.jpg (69.22 KiB) Viewed 213 times

led2.jpg
led2.jpg (91.88 KiB) Viewed 213 times

led3.jpg
led3.jpg (73.71 KiB) Viewed 212 times

jshart22
 
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Re: LED Backpack issues

by jshart22 on Thu May 06, 2021 7:12 pm

Thanks for your help.

jshart22
 
Posts: 4
Joined: Thu May 06, 2021 6:28 pm

Re: LED Backpack issues

by adafruit_support_bill on Thu May 06, 2021 7:19 pm

Not sure where you purchased them, but those are not Adafruit boards. Best to contact the seller for technical support.

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Please be positive and constructive with your questions and comments.