I'v got this USB/SD card/CompactFlash reader from an old DELL AIO 926 printer, it's a double sided PCB board and that's all i know about it. I tried to google it but couldn't find anything relevent, how can i tell what voltage it takes and what each wire does and how to interface it with arduino?
It seems to me that it has two sets of 4 wires (red/orange - black - yellow - white) and an extra blue wire, i'm guessing that the black is for GND, red/orange for VCC, yellow/white for SDA/XDA I2C serial bus data transfer, but no clue what the blue wire does, i could've tested this with arduino but i don't want to risk frying the board by using a wrong voltage. any help would be greately appreciated. thanks.