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SOIC package is as agricultural as surface mount gets. If your eyesight is OK you should be able to see any solder bridges, even slight magnification will indicate whether you have bridged any pins and on a board with a solder mask it is pretty hard to do that.
B.1). You have incorrectly wired the SPI lines between the Arduino and the module - do you have another SPI part to verify hookup
B2). Your funky hookup wires are faulty - test their continuity with a multimeter
B3) Power and ground to module reversed.
C1. Arduino is blown-up (can you load a sketch? flash an onboard LED?)
C2 The sketch is wrong as published or your changes to it for your Arduino model or specific connection are wrong. SPI initialisation wrong, wrong SPI port being used on multi-port device. Something broken in your version of Arduino IDE or library. Have you got any test equipment at all (even a LED) that could verify activity on the SPI lines at the appropriate time. ie write a new sketch or add some delays to existing sketch so you create burst of SPI activity separated by gaps of a few seconds that you can easily pick up with an LED, multimeter or some 'known good' chip or module that speaks SPI.
I'd say the most likely soldering issue for a beginner working with small SMD components would be shorts between adjacent pins, and too much solder... open circuit joints are really quite unlikely, you need very little solder to have a reliable, intact connection and it's much easier to put too much solder on than too little.
I will have a look at it for you next time I'm there, if you're there too.
On Tue, Apr 22, 2014 at 10:10 PM, Zac Watts <zwa...@gmail.com> wrote:
For those playing along at home it's a 24 pin soic chip. I'm going with its a soldering issue now.Id use some solder wick to try and remove excess solder for starters and see if that works. Other wise remove the chip, clean the board and pads of all the solder you can, and take another crack at it. Maybe try the solder paste in the fridge.
On Tue, Apr 22, 2014 at 9:32 PM, Gil Poznanski <skyler...@gmail.com> wrote:
- Gil
On 22 Apr 2014, at 8:57 pm, Zac Watts <zwa...@gmail.com> wrote:
Do you have more info on the modules and how they are meant to be wired up? I'm doubting that poor soldering is resulting in noise... maybe you have lines that are floating and need a pull-up/down resistor...?
On Tue, Apr 22, 2014 at 8:42 PM, <skyler...@gmail.com> wrote:
Hi Guys...Asking for some help here. I recently bought four LED display modules that are driven from an arduino.Over the last few weeks, I have put the modules together, but have never had any luck with getting them to work. Last Thursday, with the help of Lauren, we discovered that I was getting alot of line noise over the input/output pins.I can only think this is due to my soldering technique. While I have had some experience, I'm no getting the results I'm after. Looking for someone who is far more experienced that I to look over my shoulder as I build the last module to see if I can get it to work.Love any input anyone has to get these made and working. If I can salvage the other modules, that would be great, but right now I would love to get one to work.-Gil
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