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451  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 30, 2013, 07:50:05 pm
Breadboards are a reasonable way to prototype a circuit but not always reliable as there are a lot of mechanical contacts that can go wrong (get bumped, oxidised, changes in humidity, phases of the moon, etc). If you are sure that the circuit worked, then I would try and move all the connections (eg, remove and insert) and see if that does the trick. Better still is to build a more permanent soldered circuit based on the prototype.
452  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 30, 2013, 06:38:03 am
Unless you have a proper circuit your digital input will 'float' and switch between high and low randomly. This is your third situation.  The others produce a circuit that is the inverse of the other as far as the sensor is concerned, hence e the difference in whether you see a midi message or not.
453  Using Arduino / Programming Questions / Re: Software system development procedure question on: August 28, 2013, 04:53:17 pm
An alternative if you are already familiar with PLCs is to use some of the small 'brick' type devices that are not much more expensive than an Arduino board but could provide more robust I/O isolation for your purposes. These are probably easier to network if you need more than one, and the I/O extensions are more automatic when you have to add remote I/O.
454  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 27, 2013, 03:15:39 am
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Desktop with Windows 7 <=>
USB <=>
Arduino UNO
This I assume is just the standard programming/download cable for the Arduino, so not actually a MIDI connection.

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Arduino UNO <=>
Breadboard Wiring <=>
Midi Jack
This is the circuit, so the MIDI message generation component and circuitry for the interface

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Midi Jack <=>
MIDI to USB cable <=>
Micro USB otg cable  <=>
Nexus 7 <=>
Grand Piano pro version (supports Midi via USB)
This is the component that sends the MIDI messages.

The MIDI/USB cable has two ends - you should be connecting the 'OUT' side (labelled on the plug, usually) and LEDs - do they light up when you are sending messages? If you can't see lights, your circuitry/software is not working as expected. The USB converter cable should have no effect and seems to work given your comment previously.

If you are seeing the LEDs on the cable, then it is probably in the configuration of the software receiving the message.
455  Using Arduino / LEDs and Multiplexing / Re: Text Scrolling with Dot Matrix 8x8 and MAX7219 on: August 26, 2013, 06:20:11 pm
It looks to me like you are not inserting the next letter before the first one is completed off the display? You are also clearing the display in the loop - should this be outside the loop?

I don't use the ledControl library as I have my own (see the Parola link below or the MD_MAX72XX library in the repository). These have examples of what you want to do uising my library - it may be useful.
456  Using Arduino / Audio / Re: Improve code with midi potentiometer adding analog button for midi control on: August 26, 2013, 06:04:39 pm
It is not clear what you want to do:

1. How are the buttons wired up?
2. What do you want the buttons to do?
457  Using Arduino / Programming Questions / Re: Software system development procedure question on: August 26, 2013, 05:58:03 pm
This can make sense and is a good way to build up a system. However, you have limited resources (memory mostly) in the AVR processors, so you may need to tweak the overall process to make sure you are as efficient as possible at the end (ie, reduce duplication). This will depend on the application, but as we have no more details ...
458  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 24, 2013, 11:12:02 pm
Patch cable. Autocorrect on the iPad killed it.

How are you connecting to your MIDI device? If it has a DIN jack, then that is what you use. If it is not connecting through the DIN jack, then you need to change the serial library to use the standard serial routines. Your code is currently using SoftSerial to connect using a different port than the USB port.

This is not hard, so I am probably not understanding what you are asking properly. Just Google the MIDI standard and it is all explained there.
459  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 24, 2013, 08:23:21 am
Midi requires the circuits to be isolated and the standard uses the jacks for connectors. The midi over USB is common these days but patchy cables between devices are still mostly the DIN jacks.
460  Using Arduino / Audio / Re: What is the purpose of the Midi jack in this diagram? on: August 20, 2013, 07:01:50 pm
Midi jack is for midi output. You can tell from the sketch.
461  Using Arduino / Programming Questions / Re: Random RGB lamp on: August 19, 2013, 05:27:57 am
If you want some code that already does this to see how it works, look at the RGB mood lap sketch at my code repository, link in the signature below.
462  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: August 13, 2013, 07:24:53 pm
Same person that gave the feedback above was running 20 of them.
Correction: 20 were made but the display is only 10 modules.

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I ordered some Parola PCB’s from SeeedStudio, got the parts and LED 8x8’s and built up 20 boards. Built them up like Lego’s and they worked first time.

I must say yours is a weird one, being in the same position irrespective of which module it is. If you PM me I can put you in touch with the other 20 board pioneer smiley

463  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: August 13, 2013, 05:39:02 pm
I have received a few private emails about this project and it is good to see that others are able to use the information to do their own thing. Of interest may be the following from one of the emails as it relates to some hardware behaviour noted in earlier posts:

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I didn’t change any of your parts or circuitry, but I did add an adapter board with 3 x 10K resistors on it. They go between DI, CLK and CS to ground. When the Arduino starts up or I reset it, the matrix doesn’t flash up briefly before displaying.
 
One thing I have noticed is that some modules show junk at start up (and it never goes away). If I rearrange the modules (reposition the module that shows junk) they all still work. Just a case of finding a position it works at. I suspect it’s the 7219’s that might be getting through the QA check a little too fast...
 

If anyone finds the solution to the 'junk' being displayed, please let us all know...
464  Using Arduino / Programming Questions / Re: Redundant variables on: August 12, 2013, 09:29:35 pm
For beginners assigning the variable may be clearer, as it breaks down the syntax into smaller steps. I agree that for advanced programmers this is not necessary and wasteful of resources.
465  Using Arduino / Programming Questions / Re: Condensing code on: August 12, 2013, 03:27:04 am
Have a look at the Blink without delay example to get the concept of not using delay and then at my Multiblink sketch in the repository, link below, for data driven programs. Not beginners code but you can learn from it.
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