This unit is cheap and it reads the cards I have, working on 125kHz. It has a simple construction and is easy to open up if you would like to modify it somehow. Not so robust, comes with very little/no information regarding usage. Mine did not come with any kind of software. Powered by USB while...
This unit is cheap and it reads the cards I have, working on 125kHz. It has a simple construction and is easy to open up if you would like to modify it somehow. Not so robust, comes with very little/no information regarding usage. Mine did not come with any kind of software. Powered by USB while the data is sent over a serial link via RS232. Few computers have RS232-ports nowadays. The pinout was not known, so you would have to ponder and tinker a bit. Makes an irritating beeping noise when used, but this could be fixed by soldering away the speaker. The format which it reads the cards is a bit unknown/diffuse. I have just translated the values 0x00 and 0x80 to bits 0 and 1, and identified the card based on the whole array of bits, 28 bits is the default size for the DealExtreme-card that was included. Should come with information regarding output, voltage and much else. On the back it says "220V AC 12V DC", but by looking inside, it seems that it would be fried if you apply these voltages. It is powered by USB, so 5 volt DC ought to do it. DX should also supply a RJ14 to a more "common" pinout, for those hardware-hackers who wants to interface it in other ways than by USB and RS232. It also seems that the pins in use at the RS232-port are non-default. DB9 Pins 1 and 4 are in use for the data, the others are not used. I am not sure if it will work if you just connect it directly to your computer. I had to use an arduino to relay the serial data. Works, sort of. Does its job. Can be used for many interesting things. Flimsy but cheap. Little documentation, be prepared to use some time on making it work like desired.
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