I'm building a small setup to control a lock on-site and remotely, nothing out of the extraordinary, except for the need of a very small rfid card reader. I like to reuse/recycle stuff that lay stored on my "electronics closet" and I happen to have the perfect parts for the rfid reading. Problem is, the two circuit boards were of the type custom purpose, for the lack of better description.
Since my understanding of microelectronics is of the most basic kind, I would like to ask for your help guys in analysing the boards and see if it's possible to put the reader to work with my arduino nano. A big thank you in advance.
What you see in the pics is the following: the circuit board that has the coil soldered to it (green board) and the microcontroller (blue board). What this setup does: as soon the rfid tag (it came with the product, probably id hard coded, didn't test with different tag) is detected, the microcontroller checks it, if ok turns on the led in the green board, activates the buzzer and a small motor. After a few seconds the motor it's triggered again but rotating the opposite way. This timed rotation doesn't suit my needs, that's why I would like to have the rfid reader connected to my nano.
From the pics you can see that the green board connects to the microcontroller with 6 wires, and it's this number that lead me to believe that the interface used is the Wiegand. Also, do you think that the microcontroller could be reprogrammed?
I don't see any chips on either side of that circuit board. There is a coil, an LED, and what looks like an earphone jack. The six pins of the connector could use two pins for the coil, two pins for the LED and two pins for the earphone jack.
True, bur I was pointing out that the difference between the number of pins compared to rc522
"I don't see any chips on either side of that circuit board. There is a coil, an LED, and what looks like an earphone jack. The six pins of the connector could use two pins for the coil, two pins for the LED and two pins for the earphone jack."
Yeah, that earphone jack it's really weird. I suppose that reprogramming the microcontroller it's out of question?
Sorry, I did not notice. The second board has a 14-pin chip with the identifying markings sanded off. IF that is a microcontroller, you would have to identify it before having a chance to reprogram it.
Have you tried connecting the two boards and providing power on the red and black wires? Do you have an oscilloscope or logic analyzer to see what happens on the blue and white wires?
