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1  Using Arduino / Project Guidance / Re: Arduino + magnetic strip reader + paypal = payment processing machine? on: May 10, 2013, 12:48:02 pm
It's just going to be for "services" (rent).
2  Using Arduino / Project Guidance / Re: Arduino + magnetic strip reader + paypal = payment processing machine? on: May 10, 2013, 12:31:49 pm
So is the real answer to my question;
card present: 1.5%,
card not present: 3.5%
?
3  Using Arduino / Project Guidance / Re: Arduino + magnetic strip reader + paypal = payment processing machine? on: May 10, 2013, 12:21:17 pm
what are the two different rates?
4  Using Arduino / Project Guidance / Re: Arduino + magnetic strip reader + paypal = payment processing machine? on: May 10, 2013, 12:06:46 pm
there's no point in using a card reader when they can just click a paypal button and type in their cc info or log into their paypal account. The transactions are, at most frequent, once a week.
5  Using Arduino / Project Guidance / Re: Arduino + magnetic strip reader + paypal = payment processing machine? on: May 10, 2013, 11:10:07 am
Hi - I'm one of the developers of PayPal Here, our card reading mobile app. What you're describing is in theory possible, though you'd pay the "card not present" rate (3.5% + $.15 in the US) because you're using an unencrypted crappo swiper. But we do have APIs that would let you do this. In theory you could use our reader too, but then you'd have to reverse engineer the audio interface which would be a pain in the arse. It would be a cool demo though, so if I can provide help, I'm happy to.
It now seems that the best solution is to simply have paypal buttons put on the my site that they can click instead of the whole card-swiper thing.
6  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 13, 2013, 09:21:41 am
What I'm asking about is essentially the same thing as a sun tracker.



except it will need to follow an IR LED or small cluster of LEDs and be much faster on the response time. I know the servo can move much faster but maybe there is something else limiting the speed like the response time of the phototransistor. Do any of you with experience with this stuff think that it will be able to work with those modifications?
7  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 05:39:12 pm
Ok let's think this through. You have two photoresistors focusing on one source, and you want the turret to line up with that source, correct. Regardless of what's on the turret, you want to make it so the turret is pointing directly at the source.

Well, being that you will be receiving readings from the photoresistors, in order to find the center of the two, you will need to compare the two readings and turn accordingly.

If that is the case, it is extremely simple to do. If that's not the case, then your not clearly explaining what you want to do.
yea, that's all I'm trying to do. I want to know how far away the IR LED will be detected though. If I can't make it work at 100ft or so, then it's not worth pursuing.
8  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 05:20:29 pm
You aren't going to know the answer to the question unless you've experimented with a similar project. Trying to speculate without the necessary experience is a waste of both of our time.

I agree. Better you waste your time than mine, but that being said, the farthest I can get from my tv line of sight is 33', and my IR remote still works.
That's actually a really good example. So with an LED that was twice as bright, I should get twice the distance.
9  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 04:39:29 pm
You aren't going to know the answer to the question unless you've experimented with a similar project. Trying to speculate without the necessary experience is a waste of both of our time.
10  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 03:51:16 pm
Quote
What are the other environmental sources of IR light in an office environment?
Well, it's a 150 million kilometres away, but it's a biggie.

Quote
If they exist, then where is an IR LEd emitter/detector pair that use a spectrum that is not typically found?
Illuminators used for IR number plate recognition systems are necessarily heavily filtered to eliminate environmental IR.
Come one man. This is indoor only. I know the sun would totally mess it up. The things you're referring to are all outdoor issues. Let me be even more unnecessarily clear; In a gigantic, building sized box, with fluorescent lights, how far away can a slowly blinking IR led be to register a change in value on the IR receiver as it blinks on and off?
11  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 03:39:40 pm
OK, here's the answer you want to hear: it will work and it will be effective, and you probably don't need a processor to do it.

Now, what are you going to do about seduction by other environmental sources of IR?
What are the other environmental sources of IR light in an office environment? If they exist, then where is an IR LEd emitter/detector pair that use a spectrum that is not typically found?
12  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 03:37:25 pm
Quote
I just want a response from someone who has already worked with these parts.
Which parts?
You haven't specified any parts.
You're being unnecessarily picky. The level of detail you're asking for isn't relevant but just so you can get over this mental block, here are parts for you: http://www.radioshack.com/product/index.jsp?productId=2049723 They don't matter though because the difference between these parts and other IR phototransistor and IR Leds of the same size is obviously negligible.
13  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 03:27:50 pm
By any chance are you reffering to laser targeting? To where to point the laser and the turret follows.
nope. Just Just use the balancing of IR phototransistor values to pan a turret toward an IR LED. Really simple stuff. Someone has to have already done this before..
14  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 03:26:50 pm
What LED? a standard size IR LED

What photo transistor? an standard IR phototransistor

What transistor amplifier? none

What do you mean by "detect"? have an analog output a value different from it's previous value

What ambient light level? typical office lighting or darker

What nearby reflecting surfaces? none
There you go, it's still simple. I just want a response from someone who has already worked on something similar.
15  Using Arduino / Sensors / Re: Can you use two IR transistors and and IR LED to pan a turret? on: April 12, 2013, 02:31:08 pm
.... I thought it was already clear.

I'll simplify it: What is the range the an IR photo transistor will detect a standard IR LED?
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