TheArduinoGuy

Do NOT follow this tutorial. There should be one resistor per LED in one segment (as you will be multiplexing) so 8 resistors in total. The way this guy has done it is totally wrong.

So what is stopping that cable from getting all twisted over time as that thing goes round and round?

So which one is the correct one to use?

I have 2 x DVD worm drives (see image) but they are different lengths. Does this matter?

Yeah I totally dissambled the laser assembly with force but those magnets are stuck there like heck. I think it might be easier for me to measure them and see if I can buy them somewhere instead. Thanks.

How the heck did you get the magnets out of the laser assembly? They seem well and truly glued in there.

Why can it not be controlled with PWM ?

You have a loop that repeats 3 times inside a loop that repeats 3 times so the whole thing will run 9 times.Apart from that I see nothing wrong with the code. it shoudl stop after 3 cycles.

The easiest way is to sacrifice an LED or two and connect them up to a variable power supply and increase the voltage till it pops. At the same time, measure the current draw across the LED.

Sorry, massive bugbear of mine is when people paste code into comments. Please use the correct formatting or use Pastebin for code.

Nice project but I have no idea why you have put it into such a massive box. Look at it, 90% of the box is empty space. Use an Arduino Nano and put the whole thing into a tiny box not much larger than the LCD display.

WHOLE battery, not HOLE battery.

I'm pretty sure we were all expcting one at the end of your instructable anyway.

"The version of Arduino we will create is "ATMEGA328 on a breadboard (8MHz internal clock)", or at least that's the menu entry for it in the Arduino Tools -> Board menu."This entry does not exist.

Great tutorial but I see no reason why 2 Arduino's have been used instead of just 1.