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1  Using Arduino / General Electronics / Re: voltage regulators on: July 27, 2014, 09:48:42 am
Search eBay for "LM2596 module" for an inexpensive buck converter. Price is around $1 per module.
2  Using Arduino / Sensors / Re: IR break beam sensor on: July 27, 2014, 09:42:38 am
Two things with respect to unreliability:

1) Receiver is in bright light / direct sun. This causes it to send lots of spurious signals.
2) The datasheet recommends use of a capacitor and resistor near the receiver to filter out dirty power. I didn't need that myself and was using ~1 meter cables to connect the receivers, but y'know.

Other than that, I dunno. Your results are interesting to say the least.
3  Community / Bar Sport / Re: Name of connectors on SMD modules on: July 27, 2014, 02:24:44 am
I'm pretty sure all of the Chinese board houses (Itead, Seeed, Elecrow) will do the castellation.
4  Topics / Robotics / Re: egg detector robot on: July 27, 2014, 02:10:09 am
I don't know if they still exist, but there was the AvrCam that used a cmos camera, and was able to recognize and track round colored objects like orange balls, etc.
You might be thinking of CMUcam.
5  Using Arduino / Project Guidance / Re: GPS on Sport's Fields - too much error on: July 26, 2014, 07:43:52 pm
The "NavSpark" is a GPS receiver/processor designed for this type of problem. Not a simple project but it can be done reasonably inexpensively, and you can get 10cm level accuracy. Slapping together a rover is still a complex project because accuracy depends so much on getting good GPS signals.

The "Piksi" is another option; a little more expensive but seems to have packaged everything together a bit better.
6  Using Arduino / Sensors / Re: How do I use a KTY 81-220 temperature sensor in arduino? on: July 25, 2014, 11:37:58 am

Since yours is a 2K thermistor you would use it with a 2K resistor; example above shows a 10K resistor.
7  Using Arduino / Project Guidance / Re: IR Microcode/Microdot and Shape Scanner/Reader, and Adjustable Bluetooth ranges. on: July 25, 2014, 11:23:37 am
Example of such a pen:

I can't imagine being able to build something like this without the R&D $$$ that AnalysIR mentioned. A camera, optics, ARM processor, bluetooth, and battery management in something that size? No DIYer could pull that off.
8  Using Arduino / Project Guidance / Re: Multiple BLDC control Circuit with Arduino Micro on: July 25, 2014, 11:10:00 am
Everything looks correct to me.
9  Topics / Product Design / Re: PCB printing device on: July 24, 2014, 11:59:38 pm
You'd be better off supporting the much more economical AgIC Print project. If you really need the pick-and-place then try the RetroPopulator or Firepick Delta.
10  Using Arduino / Motors, Mechanics, and Power / Re: Mystery 30A ESC programming. on: July 23, 2014, 09:20:38 pm
Does anyone know the approximate frequencies that most ESC's consider minimum and maximum throttle positions ?

It's not the frequency of the pulses but the width of the pulse that matters.

1000us (1ms) pulse length is typically full brake/off and 2000us (2ms) is full throttle.
11  Using Arduino / Project Guidance / Re: High speed production counting on: July 23, 2014, 10:09:10 am
Search the forum for "TSSP4038". These can be used with a cheap, red laser module as the emitter if you need a precise beam.
12  Using Arduino / Project Guidance / Re: fish feeder mechanism on: July 23, 2014, 10:05:22 am
This feeder uses the lets-some-through-every-rotation method. It's not an uncommon design; you should be able to find some videos of them in action if the mechanism isn't obvious.
13  Using Arduino / Sensors / Re: IR break beam sensor on: July 23, 2014, 09:41:04 am
Just enclose the IR receiver in a short tube to shade it from other nearby emitters.
14  Community / Products and Services / Re: a DIY automation marketplace on: July 23, 2014, 04:42:42 am
You web site design is impressively absurd in its functionality. Myself, I would have never considered confronting a visitor with the requirement to scroll the page before the navigation is revealed, but I'll have to try that the next time I'm having a bad day and want to punish the world.

And your initial pseudo-splash page is ... what's the proper synonym for "garish" as pertains to a monochromatic scheme? I'm not sure such a word exists, but your site begs for the creation of such an adjective. At any rate I think you owe me an apology for the migraine you've given me. I'll also accept a video of a ball punching of your web designer in lieu of an apology.

You did ask for strong opinions, right?
15  Using Arduino / Motors, Mechanics, and Power / Re: Mystery 30A ESC programming. on: July 23, 2014, 04:21:18 am
You can find videos on Youtube showing how to program ESCs. While they typically show it being performed with an RC transmitter you can easily emulate one with the Servo library, a 10K pot, and a simple sketch that sends servo signals based on the position of the potentiometer.
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