Hi I'm working on a project with wiegand, for Access Control. For this project I use a Rfid reader wiegand 34. I would like read the card with the arduino and ask a query on a server with linux (maybe nodejs) then perform action with arduino (relay). I worked on a arduino yun, but the result is not really good, the bridge is too slow and the card is not powerful. The advantage that I liked with the udoo is the serial communication between the 2 ARM. But the disadvantage that I had not seen before, is UDOO I/O pins are 3.3V only compliant and arduino yun work in 5V. For the developement software, I think I can get there. However in electronic, I'm a beginner, and i have some questions. The wiegand send the data on 2 pins (D0, D1), What pin choose ? Is what I need a resistor? I need to light a LED and a buzzer in return, is that sending in 3v3 is sufficient to control the LED and buzzer wiegand reader ? I should control a relay to open a door, which relay choose ? To power the card I have a power like this : http://www.conrad.fr/ce/fr/product/514223/Bloc-alimentation-12-VDC-500-mA-VOLTCRAFT-FPPS-12-6W, is that it is good ? Finally, what is the micro sd to choose ? Thank you in advance for your help
Hi, UDOO is equipped with a SAM3x microcontroller (the same of Arduino Due) that is also 3v3 compliant. You don't need to use the Arduino Yun To control led and buzzer on external device it depends on its Specification, usually 3v3 should be ok. For connections i suppose you should use the same that you use for Yun. D0 and D1 are connected to the serial port. To pallow you to use internal serial to comunicate between the tro processors, I suggest to use one of these coulpes of pins (D14/15 ; D16/17; D18/19) ( http://arduino.cc/en/reference/serial ) accessible via Serial3.begin(<BAUDRATE>); // pin 14 - 15 Serial2.begin(<BAUDRATE>); // pin 16 - 17 Serial1.begin(<BAUDRATE>); // pin 18 - 19 We use relay shield like this (i suggest you pre-mounted shields cos relay needs some comonents for hardware safety): http://www.robot-domestici.it/joomla/co ... lay-shield it works at 3v3. I suggest 8GB microSD class 10, for better performance Regards
