Search found 117 matches

by Brissieboy
Mon Jun 25, 2018 6:34 am
Forum: Dot Matrix Display
Topic: New beta release "DMD2" Library
Replies: 104
Views: 41532

Re: New beta release "DMD2" Library

And I think you may need to increase the size of you buffer to 7 - the length of "string" plus the terminating null.
by Brissieboy
Fri Jun 22, 2018 1:30 am
Forum: Dot Matrix Display
Topic: New beta release "DMD2" Library
Replies: 104
Views: 41532

Re: New beta release "DMD2" Library

Hi h4rm0n1c. and welcome aboard. I have no problem with you using my mods and am happy to be able to contribute something. But before you do, just make sure you are happy with what I have done and how. I haven't done much with DMD2 because I started pre-DMD2 with the original DMD and have made quite...
by Brissieboy
Thu Jun 14, 2018 1:55 am
Forum: Module Discussion
Topic: Watchdog timer output HIGH or LOW
Replies: 5
Views: 256

Re: Watchdog timer output HIGH or LOW

According to the Arduino docs: a HIGH on the reset pin will restart the arduino The Arduino reset pin is active LOW - meaning it needs a LOW to initiate a reset, not a HIGH. So the circuit operates correctly. The old versatile 555 is one of the greatest little devices since the transistor. Amazing ...
by Brissieboy
Wed Jun 13, 2018 10:47 pm
Forum: Module Discussion
Topic: Watchdog timer output HIGH or LOW
Replies: 5
Views: 256

Re: Watchdog timer output HIGH or LOW

Oops, sorry. Didn't look hard enough. The 555 output will be high while the capacitor is charging (less than about 2/3 Vcc), only going low once it reaches that threshold. By pulsing the 'In' input you discharge the capacitor before it reaches the threshold, thus preventing the output from going low...
by Brissieboy
Wed Jun 13, 2018 5:58 am
Forum: Module Discussion
Topic: Watchdog timer output HIGH or LOW
Replies: 5
Views: 256

Re: Watchdog timer output HIGH or LOW

nicoskaralis,
From a quick look, I suspect you may have the circuit wrong. Shouldn't the 555 pin you have marked as trig (pin 2) be the threshold (pin 6)?
by Brissieboy
Thu Jun 07, 2018 7:29 am
Forum: Dot Matrix Display
Topic: DMD2 4x4 display
Replies: 7
Views: 441

Re: DMD2 4x4 display

Hi plito,
He does state in his initial post that he is using a Uno.
by Brissieboy
Wed Jun 06, 2018 3:32 am
Forum: Dot Matrix Display
Topic: DMD2 4x4 display
Replies: 7
Views: 441

Re: DMD2 4x4 display

Using the DMD library you will definitely not be able to run with your 4 x 4 DMD array. You need to limit the number on a Uno or equivalent to 6, or even fewer if you want your processor to do any other work. There simply insn't enough time to update 16 DMDs at a rate acceptable to view. You might w...
by Brissieboy
Mon Jun 04, 2018 12:19 am
Forum: Dot Matrix Display
Topic: DMD2 4x4 display
Replies: 7
Views: 441

Re: DMD2 4x4 display

Ahmed1, The short answer is that you have too many DMDs for a single Arduino to handle. There is no way to improve the performace with that many DMDs. You will have to re-think how you drive such a large array by either using a much faster processor, or changing the architecture of your design such ...
by Brissieboy
Sun May 20, 2018 10:20 pm
Forum: Dot Matrix Display
Topic: How to display running text with p4.75 panel
Replies: 1
Views: 241

Re: How to display running text with p4.75 panel

I think you will have trouble with this. I think these panels are 1/16 scan, not 1/4 scan like the DMD, but I do not have access to full details of these so this is an assumption based on what I have seen. And I am also assuming you are using a single colour display and driving it with an Arduino. I...
by Brissieboy
Tue May 15, 2018 8:01 am
Forum: Module Discussion
Topic: Using Freetronics Barometric Pressure Sensor Module SKU: CE04510
Replies: 1
Views: 351

Re: Using Freetronics Barometric Pressure Sensor Module SKU: CE04510

Have you looked at the quick start guide here?
Use analog pins 4 (SDA) and 5 (SCL) which are on the interior of the board for the I2C and connect Vcc & Gnd. That is all you need for the interconnections.
There is a library available and there is a link to in on the above page.