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46  Using Arduino / Project Guidance / Re: Beginner question on: October 07, 2013, 07:11:04 pm
I would start simple and learn how to setup and program a button first.

Then, to play audio files you will need a shield like this one
47  Using Arduino / Project Guidance / Re: Car park monitor on: October 03, 2013, 05:57:50 am
Here is an example using a distance sensor.  You could modify this one to suit your needs.
48  Community / Exhibition / Gallery / LED Sign with 2 TLC5940 on: October 01, 2013, 06:18:26 pm
When on vacation this summer I had found some plastic letters in a junk shop. 
I decided to make the following sign and finally finished it.

I used a stand alone Arduino and 2 TLC5940 chips. The sign has a photo resistor and only comes on when dark enough.
The sign also has a momentary push button to toggle through different modes.
Current modes include light one led at a time until all are lit, blink all and fade up and down.
For a video & more details check out
49  Community / Exhibition / Gallery / Re: Arduino Laser Target Game on: September 22, 2013, 05:19:32 pm
Nice project.  Well done.
50  Community / Exhibition / Gallery / Re: Voice Box on: September 22, 2013, 05:15:05 pm
Nice job Mike.  I like it.
51  Using Arduino / Project Guidance / Re: Heatsink needed? on: September 18, 2013, 06:22:36 am
Thanks for the replies.
I found I had a better wall plug rated at 5V instead of the 9V one I had been using.
I will also add a heatsink.
52  Using Arduino / Project Guidance / Re: Convert project into permanent on: September 18, 2013, 06:20:13 am
Here is another example of a standalone Arduino.
53  Using Arduino / Project Guidance / Heatsink needed? on: September 16, 2013, 06:30:39 pm
I made a stand alone Arduino  based on this with a TO-220 regulator
and am powering two TLC5940 chips with one led per pin on the TLC5940.
I will have a total of 21 yellow leds that are rated at 20mA.

I am powering all of it through the Arduino which has a 9v 600mA wall wart powering it.
I have so far put on 16 leds and the regulator is getting almost too hot to touch. 

Do I need to add a heatsink, should I be powering the leds separately, or is there a better way to make the regulator not get so hot?




54  Using Arduino / Project Guidance / Re: Diecimila & TLC 5940 on: August 03, 2013, 01:15:40 pm
Thanks for the input everyone.  I've got it now.
55  Using Arduino / Project Guidance / Re: Diecimila & TLC 5940 on: August 01, 2013, 07:32:21 pm
No chain of LEDs.  Just one per TLC5940 output.
56  Using Arduino / Project Guidance / Re: Diecimila & TLC 5940 on: August 01, 2013, 05:20:52 am
The Arduino will be powered by a 9 volt wall wart.
I will power the LEDs from the 5 volts off the Arduino.
How many LEDS can I use then?
57  Using Arduino / Project Guidance / Re: Sequencer LED on: July 31, 2013, 06:16:39 pm
When you say single slot, I assume you mean single pin on the Arduino.  3 of the pins on your RGB LED are for the three colors red, green, blue.  So, unfortunately no, you cannot use only one pin. With 8 LEDs, you will need at least 24 pins.
The fourth pin goes to +5V since this is a Common Anode LED.  Good Luck.
58  Using Arduino / Project Guidance / Diecimila & TLC 5940 on: July 31, 2013, 06:09:08 pm
I'm using a Deicimila and 2 TLC 5940 to light these LEDs for a sign I'm making.

 Bulb Size: T-1 3/4 (5mm)
LED Color: Yellow
Luminous Intensity: 2.5cd
Viewing Angle: 25°
Forward Current If: 20mA
Forward Voltage: 2V

My question is, what is the maximum number of LEDs I can use?
I know this board has an over current protection of 500mA.
Does that mean I need to stay under 500mA?
I probably only need 21 LEDs, but may need more,so to play it safe, no more than 24 of the LEDs (20mA x 24 = 480mA)?

59  Using Arduino / Project Guidance / Re: wildlife radio collar reciever on: April 25, 2013, 09:35:05 am
Tom Igoe did an interesting monkey tracking project in Ecuador a few years back.
Maybe you can get some ideas from his project.  In any case, it is an interesting read.
60  Using Arduino / LEDs and Multiplexing / Re: Shift registers - do they ..... on: March 24, 2013, 07:54:12 am
Check this out.
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