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I can see from the image that D4 & 5 are pulled low. This is a good sign as it at least means that the analyser is seeing something connected to those pins and that it is capturing something. One other thing I can see from your attached image is that the sample rate is set to 24KHz (24,000 samples p...

Can you let me know what version of the Arduino IDE, and type of Arduino board you are using and I'll see if I can replicate it.

Yeah sorry again about that. It's because in the new revision of the PCB we've reversed the silkscreen print so where before it was black outlines on a white background, it's now white on black. So the negative side, the side with the stripe, of both capacitors needs to go the the middle (the round ...

Sorry about the confusion. It appears to be a silkscreen mistake that crept into V1.1. For correct orientation the short leg of the LED (cathode) should be soldered to the square pad on the footprint, and the long leg of the LED to the round pad on the footprint. This is the case for all 4 LEDs. Hop...

Current stock is fitted with a 16GF1100 (MRF1100) and a 30UF500 (MRF500). The 16GF1100 is rated at 16V max, and the 30UF500 is rated at 30V max.

The power terminals are rated at 12A.

Thanks for the image. It looks like you have the wrong version of the module. I can see the label is correct but the module in your image is the step down version no the step up. Sorry about this, it must have somehow got mixed up and labelled incorrectly. Could you email sales [at] hobbycomponents....

Just to be sure I've just checked our stock and they do all have two buttons on them. I can see you did purchase one from us so the only things I can think of is either it's not the correct item or the button is missing? Does it look the same as the module in the image above? Also if you still have ...

Assuming I've understood the issue correctly - IC's U5,6,7,& 8 control each column so if any other LEDs on the same column are working (which in your case sounds like they are) then the problem can't be with that part of the circuit. IC U3 controls each layer so if any other LED on the same layer ar...

Do you have any thoughts on the 1*addr method? (in the fudge link). I'm not really up to speed on pointers and the like. That's not actually a pointer, or rather what a pointer in C++ is. He's just multiplying the value 8 held in the variable addr by 1 , 2, 3, 4 to get 8, 16, 24, 32 etc. These then...

Firstly if you're using two displays, and assuming you haven't already done this, make sure you set the NUMBEROFDRIVERS definition in the HCMAX7219.h file to 2 (it defaults to 1). If you using Windows don't use notepad to edit as it messes up the formatting of the file - use something like notepad++...