From 4a95719d58a708ad55b1389631d6339047f786a0 Mon Sep 17 00:00:00 2001 From: standenboy Date: Fri, 15 Dec 2023 10:19:20 +0000 Subject: added existing work --- comp/notes/5 | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100755 comp/notes/5 (limited to 'comp/notes/5') diff --git a/comp/notes/5 b/comp/notes/5 new file mode 100755 index 0000000..497d1d2 --- /dev/null +++ b/comp/notes/5 @@ -0,0 +1,18 @@ +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 + -- cgit v1.2.3