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46  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: May 14, 2014, 03:29:04 pm
There are only 2 latest versions in the download sections. So installing those versions should be correct.

The libraries have changed in the latest versions. You need to read the documentation that comes with the libraries as this will be more up to date than the forum discussions.
47  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: May 13, 2014, 11:04:26 pm
Make sure that you are using a consistent set of libraries with the examples code. Download all the latest and then try again.
48  Using Arduino / Programming Questions / Re: NFC and keypad on: May 07, 2014, 10:21:01 pm
Posting your code and circuit would be a good start to getting help.
49  Using Arduino / General Electronics / Re: led matrix and arduino on: May 07, 2014, 04:59:56 pm
This thread is probably discussing the same type of hardware
http://forum.arduino.cc/index.php?topic=222334.0
50  Using Arduino / General Electronics / Re: led matrix and arduino on: May 06, 2014, 05:03:28 pm
That IC number seems to be the communications buffer. Are there other IC numbers on the display? It is likely that these will be 595 ICs.

The display also seems similar to this one http://www.dzsc.com/product/infomation/832165/2011102885513468.html. Most of the references that come up for the display are Chinese
51  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: May 05, 2014, 04:55:09 pm
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It will be nice if some of us (Arduino rookies) can get the details of how to combine other hardware like the RTC and sensors with the LED modules we've built.

This is an interesting question and I think goes more to the way of thinking about hardware in the Arduino world than the hardware itself. Most of the simple modules used on these forums can be purchased cheaply and provide a few pins to interface to the Arduino hardware. By and large the interfaces are either Direct I/O or consist of ICs with bit-bashing serial interfaces (like the 595 or the MAX7219) or I2C or etc. The key here is that most newbies don't look at the datasheet for the hardware and jump right in, without too much understanding of what they are doing. Reading the datasheet (as difficult as some of them are!) at least gives a reason for why things are done as they are, and builds a knowledge of how to deal with classes of problems. An SPI interface to an IC is pretty much the same no matter what IC it is, so you just need to learn it once.

To take the example of the time and temperature displayed in the example video and sketch. The way I start these things is to build a knowledge of how the devices work (LED display, DS1307 Clock module, Temp sensor) individually. This requires some experimentation and code, independently of the final project device. This can be built up as part of general learning and experimentation (my preferred mode) or just specifically what is required for the project at hand. Google is a big friend here. In the software world this would be consistent with writing a function and a test harness to exercise the code to see 'what happens if ...'.

I use a 'sensor shield' arrangement and build small circuits for individual sensors on a 1"x1" prototype PCB. The sensor shield has standard Ground-Voltage-Signal (GVS) pins for each Arduino I/O and ready made 3-pin connectors can be bought in this configuration. This allows me to quickly combine the devices in different ways to test ideas. Many of the experimenter kits work in a similar fashion, but having to build the small test circuit forces me to read and understand the datasheet. I have described this arrangement much earlier in this thread, I think. [ Edit: Here it is http://forum.arduino.cc/index.php?topic=171056.30].

Once over this hurdle, integrating the devices comes down to what the project is about, which becomes quite specific to the application. The sensor shield once again allows me to mock up a large part of the functionality required before I build the final circuit. I will also, at this stage, usually breadboard some of the circuit that is not standard or too large to fit on the small protoboards.

Hope this helps. My background is in software but by breaking down the hardware into manageable 'subroutines' the ideas behind what is going on become quite manageable and easier to understand and integrate.
52  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: May 05, 2014, 01:58:01 am
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I was wondering if wabbitguy will be able to share how he was able to combine/integrate real time clock chip to one of his modules in earlier thread? Can you share the sketch codes?

Mel can give you an answer, but one of the example programs (Parola_Zone_TimeMsg) implements the time, temperature and relative humidity message that you see in the video for Parola v2. It uses a DS1307 module for the clock.
53  Community / Exhibition / Gallery / Re: ArduBank on: May 04, 2014, 06:11:43 pm
Great to see this finished! Looks interesting and I like the woodwork - has a steampunk feel to it (wooden slot machine ...)

Does every deposit guarantee a win?
Who makes the (cash) withdrawals from this machine? It could be a good way to fund your hobby smiley
54  Community / Exhibition / Gallery / Re: The Big One on: May 04, 2014, 06:07:32 pm
Interesting project. Well done and thanks for sharing.
55  Using Arduino / Programming Questions / Re: Max7219,Arduino,Matrix Scrolling Text on: May 02, 2014, 05:00:35 am
No, your code is too far away from what it needs to be for me to be able to do that.  Crossroads told you the general method in an earlier post.
56  Using Arduino / Programming Questions / Re: Max7219,Arduino,Matrix Scrolling Text on: May 01, 2014, 02:15:36 pm
This example works for everybody else so you must be doing something different.

- Have you set up the right bit rate for the serial interface?
- Have you set the monitor to send a newline at the end of the message from the serial monitor?
- Have you tried to read the code at all to see what else you need to do?
57  Using Arduino / LEDs and Multiplexing / Re: MAX7219 and 8X8 LED display problem on: May 01, 2014, 02:00:19 am
So it works? I would recommend using a socket for the matrix smiley-razz

Looking at your video again, if this is an eBay type module, the matrix should be on the same side as the IC. This is how they are shown everywhere and soldering it on the opposite side will reverse everything and make it not work.

One side of the matrix has a small square plastic tab that sticks out, as in the photo. On my Parola boards I silk screen the position so that this does not happen.

58  Using Arduino / LEDs and Multiplexing / Re: MAX7219 and 8X8 LED display problem on: April 30, 2014, 10:40:19 pm
Looks like your LED matrix is plugged in the wrong way. Unplug it, rotate 180 degrees and plug it back in. If it does not fix the problem then it is something else (maybe the software is not initialising it properly, but you have not provided any software to check).
59  Using Arduino / Programming Questions / Re: Max7219,Arduino,Matrix Scrolling Text on: April 30, 2014, 02:43:57 pm
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i tryed this sketch, but it isn't work..

What doesn't work? What were you expecting to happen that did not happen? You need to be specific.
60  Using Arduino / Programming Questions / Re: Max7219,Arduino,Matrix Scrolling Text on: April 30, 2014, 02:04:04 am
That little piece of code is in the examples I have pointing you to for 2 days. And Crossroads has told what you need to do.
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