Search found 127 matches

by Brissieboy
Fri Jul 13, 2018 3:27 am
Forum: EtherMega
Topic: are these being made still?
Replies: 1
Views: 48

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: 52

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: 52

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: 2312

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: 264

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: 264

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...
by Brissieboy
Thu Jul 05, 2018 4:27 am
Forum: Dot Matrix Display
Topic: Connecting two Displays
Replies: 10
Views: 264

Re: Connecting two Displays

Not sure what you mean by "pin for pin", but DMDs need to be connected in a daisy chain with the Arduino connected to the last DMD using the one-to-one ribbon cables supplied with them. Have a look at this . If you do have them connected correctly without success, try the demo using just a single DM...
by Brissieboy
Wed Jul 04, 2018 11:54 pm
Forum: Dot Matrix Display
Topic: Creating the Devanagari font for the DMD
Replies: 8
Views: 2312

Re: Creating the Devanagari font for the DMD

As it stands the DMD library (and DMD2 as well) cannot display combined characters. Each character is basically a bit map so a new character simply replaces the entire original. The way the DMDs work does not allow adding anything to an existing display - like over-printing. You will have to modify ...
by Brissieboy
Tue Jul 03, 2018 7:36 am
Forum: Module Discussion
Topic: XU2 Controller for LED Matrix
Replies: 3
Views: 196

Re: XU2 Controller for LED Matrix

I suspect the controllers are dedicated units for this particular type of display and are probably not user programmable, but I cannot be sure as I am not familiar with these and cannot find any info on them. Is there some software supplied with which you can programme the controller (not just setti...
by Brissieboy
Sun Jul 01, 2018 12:17 am
Forum: Module Discussion
Topic: XU2 Controller for LED Matrix
Replies: 3
Views: 196

Re: XU2 Controller for LED Matrix

Hard to offer anything useful without details of both the controller and the LED matrix. Most on this forum will be more familiar with the various Arduino boards and DMDs like this and you can find a lot of relevant information here with a little searching. Have you considered a GPS module (such as ...