This line "int GPStoRead = cardPort.BytesToRead; ", I obviously found in some GPS tutorial!

Lol, I was wondering what kind of fancy code scheme resulted in that variable name
I found an updated thread over here where similar solutions are suggested.

My best guess is that DataReceived is raised and handled before the data stream is complete. As the event is handled and data keeps being transmitted I guess the event keeps being raised. If so, both Trey's and Dan's approach seem valid. Gonna come back to studying the actual data after I have set up a WCF+rest service with db.

Trey, thanks a lot! You have no idea how much this has been bugging me. So I guess BytesToRead is the clue here? Also thanks for the work done parsing, extracting and converting the actual ID.

Guys, are you running regular Netduino, Plus or Mini? I have been struggling getting consistent readings with my ID-20. So far I have managed to isolate these factors: I have tested on - 2 different N+'s, - 2 different ID-20's, - 4 different sets of code (my own, the two libs posted in this thread and one from another thread), - 3 different breadboards, - several different sets of wires. Every run starts with the first reading being ok, then symptoms include; - DataReceived being fired more than once, - bytes separated. (See log) Now, lately I have been running 4.1.1.0_Alpha7 and 4.1.1.0_Beta1 but I figured I would try an older version. 4.1.0.6 actually seems to produce slightly more consistent results, see log. Output: With 4.1.1.0_Alpha7 and 4.1.1.0_Beta1 it might look like this: Card scanned: 3D004BEA0B97, time: 01/01/2009 00:04:04 Card scanned: , time: 01/01/2009 00:05:52 Card scanned: D004BEA0B97 , time: 01/01/2009 00:07:17 Card scanned: , time: 01/01/2009 00:08:24 Card scanned: D004BEA0B97 , time: 01/01/2009 00:08:28 Card scanned: 3D004BEA0B97 Card scanned: 3D004BEA0 Card scanned: 97 Card scanned:  Card scanned: 3D00 Card scanned: BE Card scanned: 0B9 Card scanned: With 4.1.0.6 it now might look like this: Card scanned: 3D004BEA0B97 Card scanned: 3D004BEA0B97 Card scanned: 3D004BE Card scanned: 0B9 Card scanned: Card scanned: Card scanned: 3D004BEA0B97 Card scanned: 3D004BEA0B Card scanned: 7 Card scanned: Card scanned: 3D004BEA0B97 Card scanned: So, I am wondering what hardware and firmware you have made this work with? I will try even older firmware, any other suggestions? I do not own a oscilloscope or an logic analyzer so I do not know how I could investigate data transmission and timing. Wiring using sparkfun breakout board: 5v: pin 11(5V) ground: pin 1(GND), pin 7(FS - what is this?) D4: pin 2(RST) D0: pin 9 (D0) I have tried with w/o led with resistor and permanent reset, no difference. Led signals correctly each time. Regards, Eivind

That you for sharing this class.
First time using the Netduino and loving it.

I'm having some problems getting it to work.
The card says it is reading data, but it is just returning all 255's.
Card scanned: ÿÿÿÿÿÿÿÿÿ, time: 01/01/2009 00:36:19
I have tried putting together just a simple serial reader and end up with the same output.
I can't seem to figure out why I'm not getting a valid RFID.
I have two cards and I'm pretty sure the code for both are not ÿÿÿÿÿÿÿÿÿ.


I'm pretty much using the class the same way you specify.
I coped the wiring from some other thread I found.
Pins:
11,2 = 5v
1,7 = gnd
10 = led
9 = Netduino pin 1
Hopefully I have something wired up wrong, I would hate to think i have a bad ID-20.

Thanks,
Trey Aughenbaugh

Trey, by accident I reproduced this by connecting pin 7, FS to 5v. This hopefully might of help to someone one day

I was having the same type of problems working with the ID-20 last night. Turned out the fancy see-through breadboard I got the other day wasn't making consistent contact on all wires.. This thread eventually lead me on to the cause, thanks! Only wish I had read it from the bottom up.. ;-)

Very cool, and much the same type of project I'll be approaching - as soon as I get the hang of the basics

Robonor in Norway.

Thanks for the recommendation about the 9V adapter. I've ordered a beginners kit that includes one.

What beginners kit did you order? Will any Arduino-kit do (or do you have to compensate for the 3.3v vs 5v difference)?

Eivind