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August 13, 2012
about 10 months ago
These are awesome modules, but I ran into a speed limitation while trying to run them with a Teensy 3.0. I was getting random LEDs lighting on the end modules when I had 9 daisy chained together. I ended up swapping out the Teensy with a standard Arduino Uno which fixed almost all of the noise problems. Probably could have avoided the noise issue if I soldered all of the modules together instead of using jumpers but wanted to be able to replace a module in the field if necessary.
In the end the project was a huge success, a programmable countdown timer with real-time clock set for a particular date and time, accurate to the milli-second!
Countdown to Launch Clock
9 x LED Matrix Kit
1 x Arduino Uno - R3
1 x SparkFun DeadOn RTC Breakout - DS3234
11 x Jumper Wire - 0.1", 5-pin, 4"
1 x DC Barrel Jack - Panel Mount
1 x Wall Adapter Power Supply - 5V DC 2A
4 x 3mm Orange LEDs
1 x Custom Aluminum case with silk screened faceplate
I could really use one with data connections too, would you consider adding the data lines on a future manufacturing run? I’ve created a revision to the Eagle files available here that could use the 4 pin Polarized Connectors PRT-08231 (https://www.sparkfun.com/products/8231). Modified Eagle files located at http://www.thundapurr.com/files/LiPo-Charger-Basic-v11.zip for anyone interested in making it themselves.
about 2 years ago
I commend Sparkfun on exceptional build quality and a decent price but I have one complaint. The width of the board does not allow for seamless, edge to edge arrangement, at least on the dozen I ordered. The LED matrix supplied measures 31.9mm but the board is 33.8mm. The gap won’t effect my project but if I was anticipating building a scrolling LED sign it would have been an issue. Another manufacturer’s board measures 32mm so it was much easier to eliminate the gap or at least make it not as noticeable. I decided to go with the Sparkfun board because the MAX7219 was an original part, the other board supplied a knockoff and I had a hard time eliminating flicker and random dots (not a power supply issue).
about 2 years ago
Would there be a chance of getting a side photo with the vertical dimensions? I’m building a panning camera controller to add motion to a Dropcam, it would be nice to know the vertical dimensions so I can design the enclosure.
No public wish lists :(
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