Search found 131 matches

by Brissieboy
Sat Aug 11, 2018 11:10 pm
Forum: Dot Matrix Display
Topic: Without Arduino
Replies: 2
Views: 96

Re: Without Arduino

No. There is no way to control the LEDs (except for all LEDs OFF) without something driving the inputs.
by Brissieboy
Thu Aug 02, 2018 6:18 am
Forum: Dot Matrix Display
Topic: The word cannot display correctly
Replies: 6
Views: 254

Re: The word cannot display correctly

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 ...
by Brissieboy
Wed Aug 01, 2018 10:30 am
Forum: Dot Matrix Display
Topic: The word cannot display correctly
Replies: 6
Views: 254

Re: The word cannot display correctly

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...
by Brissieboy
Fri Jul 27, 2018 11:36 pm
Forum: Dot Matrix Display
Topic: Problem with getting new font to work
Replies: 7
Views: 2568

Re: Problem with getting new font to work

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...
by Brissieboy
Fri Jul 13, 2018 3:27 am
Forum: EtherMega
Topic: are these being made still?
Replies: 5
Views: 520

Re: are these being made still?

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.
by Brissieboy
Fri Jul 13, 2018 12:06 am
Forum: Project Showcase
Topic: Using 1N4148 not 1N4007
Replies: 1
Views: 344

Re: Using 1N4148 not 1N4007

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?
by Brissieboy
Fri Jul 06, 2018 11:50 pm
Forum: Project Showcase
Topic: How to use ULN2003apg
Replies: 1
Views: 113

Re: How to use ULN2003apg

The ULN2003A has an integral base resistor so you should connect direct to MCU output. They require around 2V to turn on so they should be OK driven from the 5V output. Data sheet. Not sure why you have the common pin connected - it should be left open when driving non-inductive loads. Your post sou...
by Brissieboy
Thu Jul 05, 2018 11:39 pm
Forum: Dot Matrix Display
Topic: Creating the Devanagari font for the DMD
Replies: 8
Views: 2479

Re: Creating the Devanagari font for the DMD

I think you might need to add a new function which retrieves your characters and processes them, then call drawChar() to display it. You would need to manage the display of your string carefully - only using drawstring when there are no overprinted characters. You could do this within your sketch wi...
by Brissieboy
Thu Jul 05, 2018 11:16 pm
Forum: Dot Matrix Display
Topic: Connecting two Displays
Replies: 10
Views: 438

Re: Connecting two Displays

Using 3V will still load your Arduino and 74HC245 on the DMD. I strongly suggest NOT going that way. DMD2 brightness control should work. If not, have a look at this link for control of the brightness (but for DMD not DMD2)? There should be no issues controlling brightness using an LDR, but an IR se...
by Brissieboy
Thu Jul 05, 2018 10:57 am
Forum: Dot Matrix Display
Topic: Connecting two Displays
Replies: 10
Views: 438

Re: Connecting two Displays

If you check out the circuitry and interconnection between the Arduino and the DMD you will notice that there is NO 5V power rail connection. If you do not supply power to the DMD then it can only be sourced via the asserted interconnections which then feed power to the 5V rail of the DMD via the pr...