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1  Using Arduino / Project Guidance / please help choose a micro-controller to work with image sensor MT9P401 on: January 16, 2014, 11:36:07 am
Hi guys,
I'm trying to build a PCB that would contain the MT9P401 ( www.aptina.com/products/image_sensors/mt9p401i12stc/ ) image sensor and would connect to a computer via USB. Upon a computer's commant, it should snap a photo and transfer it back to the computer via usb.

Yet I can't choose what kind of a micro-controller should I use. Maybe you could suggest something or point me to some tutorials about using MCs with image sensors?

Thanks. )
2  Using Arduino / Motors, Mechanics, and Power / Re: how to connect a BI-POLAR motor to ULN2003 board on: October 29, 2013, 10:56:14 am
thanks, no problem, already got an L293
3  Using Arduino / Motors, Mechanics, and Power / how to connect a BI-POLAR motor to ULN2003 board on: October 29, 2013, 06:58:23 am
Hi guys,
I have some ULN2003 boards laying around, the ones with 5 outputs and a BI-POLAR stepper motor with 4 wires. Is there a way to connect them?

Thanks!
4  Using Arduino / Project Guidance / Re: LaserPointer and two Servos - need sample code on: October 11, 2013, 01:32:22 am
no, a moving dot is fine. Like here
5  Using Arduino / Project Guidance / LaserPointer and two Servos - need sample code on: October 10, 2013, 03:21:48 pm
Hi guys,
I'm trying to use two servo motors and a laser-pointer to "draw" some shapes and was wondering if someone might have some sample code, that would take in some shape images or vectors or some other easy-to-make form and translate/map them into servo motor movements.

Thanks )
6  Using Arduino / Project Guidance / Re: wanna make a laser-show - can I use a DC motor? on: October 02, 2013, 01:49:33 am
Yeap, thought about it all night and think you're right. the polygonal mirror thing would be too clumsy, etc.
A commercially available "laser scanner" ( http://www.aliexpress.com/item/LP-8K-Mini-Galvo-System-laser-Galvanometer-Based-Optical-Scanner/677222002.html ) is a bit too expensive at 120$ ... any ideas of a cheaper source?

Meanwhile I'll try to crack some old HDD open and try a voice coil motor from there. )
7  Using Arduino / Project Guidance / Re: wanna make a laser-show - can I use a DC motor? on: October 01, 2013, 12:55:00 pm
Interesting idea! This things are called "polygon mirror motor" or "polygon mirror scanner", http://www.aliexpress.com/wholesale?SearchText=polygon+mirror+motor
Do you think this ones can be driven by an arduino?

Here's how it supposedly looks inside a laser printer.


Now have to decide what to do about the "vertical" motor, which as to work 100+ tunes slower. I could either use one more such unit or, maybe, fix the first unit, with the laser, on a brushless motor, what would just swing it back and forth...
8  Using Arduino / Project Guidance / Re: wanna make a laser-show - can I use a DC motor? on: October 01, 2013, 12:28:33 pm
Say i want 10 "frames" per second, therefor the "vertical" motor should make 10 turns per second, while the "horizontal" at least 100 per each "vertical" turn, therefor 100x10=1000 rps or 60.000 rpm.

Hmm... most brushless motors that I found would give about 1000-2000 rmp. Simple toy DC motors give 15.000rpm

Well, since 60.000 rpm anyway aren't available, would have to adjust the project either to a DC+hall sensor at ~15.000 rpm or a brushless at ~1500 rpm.
9  Using Arduino / Project Guidance / Re: wanna make a laser-show - can I use a DC motor? on: October 01, 2013, 11:11:58 am
Thanks! And an even better idea - instead of using a simple dc motor with a hall sensor, I could use a brushless motor, so arduino, while driving it, would know it's position! )
10  Using Arduino / Project Guidance / Re: wanna make a laser-show - can I use a DC motor? on: October 01, 2013, 10:13:01 am
Because servo/steppers are too slow and you would see just the laser dot moving, instead of a whole shape.
DC motor would be simply continuously spin the mirror at a pretty high rpm and with arduino turning the laser on/off at the right time, hopefully, it would look like a shape drawn.

By the way, if we look at "DJI Phantom Brushless Gimbal Camera Mount", it's using brushless DC motors ( not steppers or servos, right? ) for such micro-movement?
11  Using Arduino / Project Guidance / wanna make a laser-show - can I use a DC motor? on: October 01, 2013, 09:57:44 am
Hi guys,
I'm looking for a way to make a sort-of-a laser show ( i.e. like write something on a wall, or draw a shape ).

Probably the professional method of choice would be to use galvanometers ( http://www.aliexpress.com/item/LP-8K-Mini-Galvo-System-laser-Galvanometer-Based-Optical-Scanner/677222002.html ), but the cheapest I could find are >120$ and have a pretty big drive box.

Trying to make my own galvos from a speaker, as shown here http://www.instructables.com/id/Arduino-Laser-Show-with-Full-XY-Control/ , would be way messy, big and inaccurate.

So here's the idea I came up with - I could use two simple DC motors with mirrors attached to them and a hall sensor, that would tell arduino its position. And have arduino turn the laser on and off at the right time.

What do you think? smiley
12  Using Arduino / Project Guidance / Re: powering a 12v LED ring from 5v USB, whould it work? on: September 14, 2013, 11:56:34 am
I see... then guess will have to feed it from a AC adapter + PWM from arduino to make it less bright.
13  Using Arduino / Project Guidance / powering a 12v LED ring from 5v USB, whould it work? on: September 14, 2013, 11:08:20 am
Hi guys,
I need an LED ring for my camera that would be able to reasonably illuminate objects just some 15~20 centimeters ( <7" ) away.
I found such "angel eye" ring ( http://www.aliexpress.com/item/led-angel-eye-light-car-ring-3528-33led-100mm-diameter-white/527583494.html ) that has 33 leds - 3528 - and is supposed to run on 12v.

What do you think, if I'd feed it with just 5v from USB ( via a transistor & arduino ), would it work fine for my purpose?

Thanks smiley
14  Using Arduino / Project Guidance / Re: LED flash ( for camera ) - how to make one and what led should I use? on: September 09, 2013, 12:37:48 pm
ok, then with a transistor for the USB ? )
15  Using Arduino / Project Guidance / Re: LED flash ( for camera ) - how to make one and what led should I use? on: September 09, 2013, 12:03:57 pm
Thanks for the info, I've found "5mm clear white 25cd 15gr" in my local store. Not sure about their mA, thought. Do you think connecting like 4 of them in a chain and to an output pin would be fine? smiley
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