Identify four feedback/control systems in everyday environment.
a) sensing mechanism
b) actuation mechanism
c) control computation
d) what works well
e) what works poorly
1. THE ID SWIPE ACCESS SYSTEM AT MIT
http://groups.csail.mit.edu/mac/classes/6.805/student-papers/fall04-papers/mit_id/
a) the magnetic strip or IC/memory chip inside the ID
b) the door connected to the reader
c) the information on the magnetic strip or the IC/memory chip
d) How quick and low effort it is to swipe by holding the card against the reader. (compared to how the Wellesley swipe system works. ) Also, based on the information on the data base, it is useful to control who has access to which doors because of the chip.
e) To those who knows how to hack into the system, this system makes it able to open a door with hacking into the system/knowledge in computer science. Another problem is it doesn’t verify who has the card so if someone stole the ID, he/she/they will be able to have access.
2. THE MACBOOK CHARGER
a) the (magnetic) connection of the charger itself to the computer
b) the light that turns green when charged and orange when its charging.
c) the power from the charger once connected
d) the magnetic connection makes it easy to connect. the light allows the user to avoid over charging.
e) the system itself is a open loop so although the light may turn green after fully charged, it will keep on sending voltage to the computer=waste of power.
3. VIDEO GAMES (Play Station Portable)
a) by the buttons pressed by the player/user
b) the visual animation on the screen
c) the circuits working based on the power charged, also based on the type of game installed
d)
e)
4. BLUETOOTH SPEAKERS
a) the wireless communication channel, the on/off switch
b) the music that is played
c) the speaker itself
d)
e)
???!!!!??!?!?!