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1306  Using Arduino / Project Guidance / Re: IC w/ individual PWM for RGB high current application on: February 06, 2013, 05:39:06 pm
A TLC5940 will do 350ma out if you combine three channels together. 16 total channels are available. It's a DIP chip. eBay price is around $1.50 or domestically it's around $3.

Here's some links for the Arduino and DMX.
1307  Using Arduino / Motors, Mechanics, and Power / Re: Mystery stepper...help with finding number of steps on: February 06, 2013, 02:15:15 pm
200 steps / 1.8 degree is standard and most likely what you have. I have seen steppers with 0.9 degree and 7.2 degree steps, but those are the smaller "pancake" type of steppers.
1308  Using Arduino / Microcontrollers / Re: Attiny85 Invalid device signature... on: February 06, 2013, 01:57:07 pm
Do you have any status LEDs on pins 9, 8, 7? IMHO the first step is to actually ensure you have ISP running.
1309  Using Arduino / Motors, Mechanics, and Power / Re: Arduino and Powerlolu on: February 06, 2013, 10:47:32 am
Typical stepper drivers have STEP, DIR, and ENABLE pins and your Powerlolu follows that interface. Shouldn't be any problem.

Here's an example using the EasyDriver (again, same step/dir/enable interface): http://bildr.org/2011/06/easydriver/

1310  Using Arduino / Sensors / Re: Angular position measuring on: February 05, 2013, 11:29:11 pm
A potentiometer would probably be easiest if you can find one that's durable enough and allows continuous rotation.
Do I need an encoder as I am using potentiometer ?
No, you just need an encoder or a pot. Personally I've never seen a potentiometer used for continuous rotation and would expect them to be expensive; encoders seem better suited to this type of purpose.
1311  Using Arduino / Motors, Mechanics, and Power / Re: Mystery stepper...help with finding number of steps on: February 05, 2013, 05:34:08 pm
Disassembling a stepper motor is a bad idea as it apparently causes permanent damage to the motor.

To upload an image, when composing a reply, look near the bottom left of the composition window where it says "Additional Options". Click it and it will expand to a menu that will allow you to upload an image.

1312  Using Arduino / Motors, Mechanics, and Power / Re: Logic Level Mosfet on: February 05, 2013, 05:27:50 pm
Try FDP65N06, IRLU3636PBF, or FDP3651U (Hint: google "octopart.com FDP65N06")

Personally I think newark.com has the best search. It does allow you to search by Rds(on).
1313  Topics / Science and Measurement / Re: Change ID field with xbee-arduino on: February 05, 2013, 02:35:44 am
You want Digi's "X-CTU" software to perform that type of configuration of an XBee. This type of configuration is assumedly left out of the Arduino library to keep the library small.
1314  Using Arduino / Motors, Mechanics, and Power / Re: Unsure which motor controller to use on: February 04, 2013, 11:51:40 pm
Is it just me or is this going in a circle?
1315  Using Arduino / Project Guidance / Re: Arduino Uno or Labjack U3 for new project?????? on: February 04, 2013, 05:58:36 pm
There are plenty of PC-to-Arduino interfaces available (http://playground.arduino.cc/Main/InterfacingWithSoftware) that would be comparable to LJStreamUD. Reading 6 analog inputs and sending them over serial 100 times a second is not a difficult interfacing problem, mind you.

Personally I wouldn't want to invest time in learning the LabJack. You say you know electronics and C programming so I don't think you'd have problems getting up to speed on Arduino.

Aside from the price the Arduino has one big advantage over the LabJack -- you can disconnect the computer smiley-wink
1316  Community / Products and Services / Re: Industruino - DIN-rail Leonardo compatible on: February 04, 2013, 04:14:24 pm
Looks like a very nice implementation.
1317  Using Arduino / Sensors / Re: Angular position measuring on: February 04, 2013, 03:31:01 pm
A potentiometer would probably be easiest if you can find one that's durable enough and allows continuous rotation.

A couple links for fairly inexpensive encoders:

http://www.usdigital.com/products/encoders/absolute/rotary
http://www.cui.com/Product/Components/Encoders/Absolute_Encoders/Modular/AMT203-V

There are also ICs (e.g. AS5030) that will sense the rotational position of a magnet placed over them. Offhand I can't seem to find any retail breakouts for them. The least expensive option but also the most difficult to implement.
1318  Development / Other Hardware Development / Re: Air flow sensor on: February 04, 2013, 03:56:42 am
Try http://shop.moderndevice.com/products/wind-sensor for a thermal example.

1319  Using Arduino / LEDs and Multiplexing / Re: ir led is too weak on: February 04, 2013, 02:34:32 am
For optimum distance you should make sure the wavelength matches but you should still get up to 2 meters distance with a red LED (or white works well also) if it's a good bright one. Being able to see the LED light up is obviously a huge advantage when you're testing.
1320  Using Arduino / Motors, Mechanics, and Power / Re: arduino motor controllers in parallel? on: February 03, 2013, 12:33:33 pm
I'd just been studying the same problem with the L293 when I took a break and saw his question about the L298 so I knew it could be done/has been done. Digging a bit deeper it looks like the recommendation is that the chips come from the same batch so they'll have the same switching times and share the current more evenly.

Nothing will blow up but you should watch the heat of the chips to make sure they're sharing well.
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