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31  Using Arduino / Project Guidance / dimming neon (not fluorescent) on: April 11, 2012, 07:15:32 am

I want to do some fast dimming of a neon (real neon, not fluorescent) sculpture. I'd like to do various fast patterns and random switching.

The ballast I am getting is the 6th from the top called "9.000":

It has a 0-10v dim input. Can I just take a 10k digital pot and dim away? Are digital pots fast enough for "switching" as well?



32  Using Arduino / Programming Questions / DigitalToggle in 1.0 on: March 24, 2012, 05:50:10 am
The super useful library DigitalToggle  does not compile in 1.0
It works fine in 0023

this is the error I get:

/Users/holby/Documents/Arduino/libraries/DigitalToggle/DigitalToggle.cpp: In function 'void digitalToggle(uint8_t)':
/Users/holby/Documents/Arduino/libraries/DigitalToggle/DigitalToggle.cpp:25: error: 'digitalPinToPort' was not declared in this scope
/Users/holby/Documents/Arduino/libraries/DigitalToggle/DigitalToggle.cpp:25: error: 'portInputRegister' was not declared in this scope
/Users/holby/Documents/Arduino/libraries/DigitalToggle/DigitalToggle.cpp:25: error: 'digitalPinToBitMask' was not declared in this scope

does it contain any clues? I would hate to drop using this wonderful little shortcut...


33  Topics / Interactive Art / Re: Laser Harp. Trouble with Abelton on: February 17, 2012, 04:11:12 pm

Get a midi monitoring software to see if anything useful is coming in.

I use but its for mac. I'm sure you can find something similar for PC.
You need a clear note on / note off message.

Try using the midi library

I guess its a stupid question but have you completely enabled the interface in able tons prefs/midi?

I had some issues when doing similar things of the notes being complete enough to be recognized as notes by the midi interface (the led blinking) but the serial data was incomplete and it was not a real not on/off as far as ableton is concerned.

And install a driver for your usb interface if one is available...


34  Using Arduino / Programming Questions / Re: 2 serial ports on: February 17, 2012, 08:08:52 am

I looked at the (new)softWareSerial, that would do the trick I suppose.

So the BT interface and the tx/rx pins on a bluetooth arduino just mirrors each other?

Maybe somebody can recommend the right solution:

I need to send and receive serial from the roomba over a cable and pass on commands and feedback wirelessly to/from my computer.

I thought a BT arduino would be perfect, but maybe better with a Mega with a zigBee or BT shield?

thank you

35  Using Arduino / Programming Questions / Re: 2 serial ports on: February 17, 2012, 07:41:41 am

Is mega the only board that can do multiple serial?


36  Using Arduino / Programming Questions / 2 serial ports on: February 17, 2012, 07:22:43 am

I would like to send/receive serial from a roomba over the tx/rx pins on a bluetooth arduino and use the bluetooth connection to send me serial monitor feedback.

Is it possible to write serial commands to two different outputs? And how do I address them individually?

thank you

37  Using Arduino / Project Guidance / Re: dimming lots of lightbulbs on: November 29, 2011, 05:35:57 pm
a. Yes.
b. Yes.
There are not much difference between LED and bulbs, except thermal inertia, which is good for PWM

awesome, thanks!

Now how do I calculate the amount of DC current a bulb with say 40w needs?

Basically, I intend to do this like I would a LED matrix, a 74HC595 shift register can't handle this right?
Do I need something more powerful, or transistors?

I am looking for the minimal solution, space and budget wise to do this...

38  Using Arduino / Project Guidance / dimming lots of lightbulbs on: November 29, 2011, 02:51:47 pm


I would like to dim a bunch of (like 400) standard incandescent lightbulbs.

a. Can I run a standard bulb on DC? It would make things a lot simpler
b. Can I dim (plenty and fast) a standard bulb with PWM?

Basically I want to treat a bulb like a LED, but with a sturdier schematic of course...

cheers folks!

39  Using Arduino / LEDs and Multiplexing / Re: DM74LS47N 7seg Decoder wiring on: November 22, 2011, 11:40:02 am
How can I chain 4 of them? or do i need all those outputs for each chip?


40  Using Arduino / LEDs and Multiplexing / DM74LS47N 7seg Decoder wiring on: November 22, 2011, 04:22:09 am


Does someone know how to wire up a DM74LS47N? (
The outputs for the segments are obvious but I do not understand the inputs.

I need to hook up 4 of them.

Thank you!

41  Using Arduino / LEDs and Multiplexing / Re: Programming 7- segment with Arduino on: November 22, 2011, 04:16:16 am
I just did a tutorial that uses the 7 segment display as an example of how to code:-

42  Using Arduino / Project Guidance / Re: Jumbotron? on: August 02, 2011, 06:44:01 am

I guess dimming is a pipe dream. So if I go for switching I should still look at triacs right? I did a lot of relay switching but it is expensive and bulky.

43  Using Arduino / Project Guidance / Jumbotron? on: August 02, 2011, 05:59:46 am

I am looking at building a large array of dimmable lightbulbs. Most dimmer circuits I looked at are quite complex (for me). Especially if you need 400 of them.
Any ideas how to simplify the process? Can I dim a lightbulb using a circuit like this and PWM?


44  Using Arduino / Project Guidance / Re: K6714-16 Relay board on: July 02, 2011, 12:27:44 pm
hello Korman

Thanks, thats perfect, I am just about to connect the boards.

The board is powered by the 220v input as I understood it. I intend to power the arduino with the 12v coming out of the K6714-16, bad idea?


45  Using Arduino / Project Guidance / K6714-16 Relay board on: June 28, 2011, 11:36:48 am


There are some threads about this here, but nothing resolved.
Before I purchase a K6714-16 relay board I have a few questions:

The assembly instructions states that:
Output 12V CC can be used as a power supply for other kits. Does this mean I could power a Arduino Mega with those 12V?

The ULN2803 type transistor array allows you to control the relays directly from a TTL or CMOS. For controlling the relay with open collector control, don't mount the transistor arrays. How does this apply to the arduino?

And last but not least, I can not figure out if I will be able to control this with my arduino digital outs. Is there enough power there to switch the relays? And do I need something between the arduino and the board?

Thank You


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