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Defective Item Help
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Defective Item Help

by anonymousperson0 on Sun Jun 07, 2020 12:35 pm

Recently I decided to try the NeoMatrix 8x8 word clock project for a birthday gift. When I soldered everything together and programmed it, the NeoMatrix however did not light up. All the connections are working, and the light on the trinket pro does light up. There are 3 possibilities:

1. The GPIO pins on the trinket are defective.
2. The RTC is defective.
3. The NeoMatrix is defective.

The programming did go successfully. Can someone help me with this (and maybe find a way to test the individual parts)? Thanks!

Aaron
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anonymousperson0
 
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Re: Defective Item Help

by anonymousperson0 on Sun Jun 07, 2020 12:37 pm

More photos:
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anonymousperson0
 
Posts: 3
Joined: Sun Jun 07, 2020 12:20 pm

Re: Defective Item Help

by oesterle on Tue Jun 09, 2020 3:03 pm

Hi, anonymousperson0!

Welcome to the Forums!

I think your RTC is soldered to the board shifted by one pin. Note that the RTC's SQW pin is unused in the project. This image from the Circuit Assembly section of the tutorial shows what it should look like:

Image

This is important, as pins A4 and A5 on the Pro Trinket are used to communicate with the real time clock.

I would also try a basic NeoPixel example, to make sure my my matrix was wired correctly, like:
File > Examples > Adafruit NeoPixel > simple, in the Arduino IDE.

I'd modify the NeoPixel simple example to specify a small number of pixels (no more than 2 or 3), so as not to draw more current than the Pro Trinket's 5V pin provides (150mA, as illustrated in the Pinouts section of the Pro Trinket primary guide.) I'd also modify the #define PIN line to use pin 8.

I'd take care desoldering,
  • carefully clipping the pins between the RTC and the Pro Trinket
  • removing the pin stubs with needle-nose pliers while desoldering (see Desoldering in Collin's Lab: Soldering)

Thanks for posting sharp photos of your wiring! Looking forward to seeing your progress.

Cheers,

Eric

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Re: Defective Item Help

by adafruit_support_carter on Wed Jun 10, 2020 6:00 pm

Nice spot @oesterle. That does seem to be a likely scenario.

And good suggestion to try a simple NeoPixel only example code as a quick sanity check of that hardware.

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Re: Defective Item Help

by anonymousperson0 on Wed Jun 10, 2020 6:23 pm

Thanks oesterle!

Turns out I did shift the pins over. It works now!

anonymousperson0
 
Posts: 3
Joined: Sun Jun 07, 2020 12:20 pm

Please be positive and constructive with your questions and comments.