I need an electronic device, able to control a 4×4 matrix keyboard and magnetic stripe reading tracks (1 & 2)
You should save your data in an internal memory for downloading via serial.
the device must have minimum measures.
This link provides an example
http://www.cardreaderfactory.com/shop/msrv008.html
reference not to use the values published in the website, therefore I am looking for more economical solutions and real.