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1  Forum 2005-2010 (read only) / Interfacing / Re: Coding Question: Making a ShiftIn on: March 13, 2007, 01:33:18 pm
Hmm.. Isn't the Clock an input too?  :-/
2  Forum 2005-2010 (read only) / Interfacing / Coding Question: Making a ShiftIn on: March 11, 2007, 10:42:26 pm
Hey folks.

How would I go about coding something like a"ShiftIn" function? I have a "clock in" and a "data in", and I want to print the results to the serial port.

Thanks in advance!  ;D
3  Forum 2005-2010 (read only) / Interfacing / Re: Mifare 500B RFID Reader on: July 18, 2008, 07:26:08 pm
*bump*

Here's an article I posted about this neat little board.. Maybe something in here (including the link I included to the Fudan Microelectronics FM1702NL datasheet) will help?

I noticed that the FM Chip is part of a series, with other options including more protocols... I wonder if they're swappable?  :smiley

Anyways, here's my writeup, so far, on this little guy. http://erroraccessdenied.com/node/1636.

I just dug out my Arduino, so I'll have to try connecting the two. I'm guessing it'll be by UART.
4  Forum 2005-2010 (read only) / Interfacing / Re: Mifare 500B RFID Reader on: October 26, 2007, 06:53:19 pm
Quote
Where did you get it? I've been looking for something that could handle multiple simultaneous reads (anticollision)  I'd be REALLY interested in your progress. Please keep me posted.

Thanks,
Dale
I got it from eBay, from http://stores.ebay.ca/Univelop-Tech-LLC. It came with a credit-card-sized plastic card, not sticker-card like it says in the auction, but I'd rather have a plastic one, personally  8-)

Look for "13.56Mhz RFID Reader module with C source&Doc & Antenna" under the "RFID" section. The website, which is in SERIOUS need of an upgrade, is http://www.rfidgeek.com/. I'll be posting relevant stuff on my website later on. I'll post again when I do.

Search up the "Philips Mifare MF RC500" IC datasheet, the reader uses either that or a clone.
Also, see http://en.wikipedia.org/wiki/MIFARE and http://www.mifare.net/ for an overview of the technology used.
5  Forum 2005-2010 (read only) / Interfacing / Re: Mifare 500B RFID Reader on: October 26, 2007, 12:17:41 am
Hi!

I just got one too!  ;D Funny how those things seem to happen. Anyways, I'll try, and see what happens  smiley-wink
6  Forum 2005-2010 (read only) / Interfacing / Digital Input Question on: August 27, 2006, 11:22:23 pm
Hey all. I've got a barcode reader that gives:

Quote
"A series of pulses with widths proportional to the widths of the bar code elements being scanned. A low output represents a bar, and a high output represents a space. The frequency of the pulses depends on the density of the symbol being scanned."
--LT 1800 Product Reference Guide

How would I read this? I've tried reading it as serial, but I don't think that's how it was meant to be done. Right now i'm toying with pulseIn HIGH and LOW, but I have a feeling that:
Code:
 duration1 = pulseIn(barCode, HIGH);
  duration2 = pulseIn(barCode, LOW);
misses a whole LOW, HIGH series in between, based on its description. If the first pulseIn waits for a HIGH, then counts until it hits a LOW, the next pulseIn wouldn't start on that LOW, it would start on the next LOW, right?

I mean, with that in my loop, I get about half the number of HIGH/LOW that I should for a barcode.

How *should* I do this? Is the PWM feature on the output only, or is there some kind of PWM input functionset?
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