5 (840B)
1 io devices 2 barcode reader 3 it shines a light, then more light reflects from the white than the black, then it uses that to read a string 4 white is 0, black is 1 5 barcodes have a product number on the right and a manufacture number on the left 6 the right hand side codes are writen through a not gate (inversed) 7 qr codes 8 the same as a barcode but 2d 9 digital cameras 10 they look at how much light enters the lens then depending on its color and brightness it will output a different value 11 each pixel the camera outputs must have its own small light/color sensor 12 lazer printer 13 a negative static charge is put on paper 14 puts ink down thats atractive to the negative charge 15 rfid 16 it sends some radio waves out, then reads the radio waves sent back 17 some devices require active power, while other can get power from the incoming radio waves 18