Freetronics Forum

Scrolling speed is determined by how often you step the marquee. If you are using the original DMD library this is done by dmd.stepMarquee(), or for DMD2 it is dmd.marqueeScrollX(), which you execute within a timed loop. So all you need to do is adjust the timing of the loop to alter scrolling speed.

The SPI interface requires the 3 lines: - PIN_DMD_CLK - PIN_DMD_SCLK - PIN_DMD_R_DATA There is plenty of resources available which explain how this interface works. The DMD is arranged in 4 blocks and the 2 lines: - PIN_DMD_A - PIN_DMD_B are used to select which 1 of the 4 is currently active. And f...

Have a look at this topic . There is a file attached to one post called "MyBigFont.h". Have a look at that file. It should help explain how these fonts work. There are comments added throughout as well as a description of how it is built at the end of the file. This might help you to construct your ...

Scrolling with multiple displays does not perform very well the way the DMD2 library currently works at the moment. It is a result of the way it works, not the actual scrolling function. I would suggest you use the original DMD library. It certainly lacks some of the features of the DMD2 library, bu...

No. There is no way to control the LEDs (except for all LEDs OFF) without something driving the inputs.

I had used arduino uno and also tried the sample sketches supplied with the library. The result is the dmd was working but the pattern of led are not lit as usual. This indicates that something is probably wrong with your setup rather than your code. I had power the dmd using usb port only without ...

Well it could be either, or even something else. We have no way of telling without more details - such as seeing your code - are you using a Uno or something else? - hardware/wiring configuration. Have you tried the sample sketches supplied with the libraries? If they work, then it is a problem with...

Supposedly the <brackets> tells the pre-compiler to look in the default include directory, "quotes" tells it to look in your working directory (where your .ino file is) but I think it will also look in the default include directory if it doesn't find the file. When it is a newly added file, you do n...

Pretty sure these were a Freetronics project and they appear to be discontinued. They are not real active on the forum so it might pay to try sending an email to support@freetronics.com to see if they can offer you any hope.

You could try them, but they are very different devices and will may not work reliably. The 1n4148 is a fast switching diode while the 1n4007 is a power diode and very slow in comparison.Tried Ebay or other on-line option if you can't get to a supplier?