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