Switches_Logic

toc

Introduction:
Switches turn circuits on and off. Some of the most interesting switches are the kind that operate automatically. For example, a thermostat will automatically turn the furnace on when the temperature gets too low. A refrigerator will automatically turn the chiller on when the temperature gets too high.

Activity:[[image:D1_Clip.png align="right" link="@http://scitechcox.wikispaces.com/file/detail/D1.png"]]

 * Get the document D1 Temperature Switch from your iCal. Construct the circuit as shown, capture the image into your ComicLife document, PDF it, and submit it to the Hand-in Robot.
 * Try the quiz D2, linked to your iCal, or to the icon on the right.
 * media type="custom" key="4943975"

Practice:
Read the following story, and design a circuit that would do the job! //I have the strangest dog. Her name is Regi. When I am not home, at least according to the neighbors, she never barks. When I am home, though, there are lots of situations that get her barking. If a cat or a squirrel walks by, she barks. If the doorbell rings when we are home, she barks. If the phone rings, she will bark if I am asleep, but not if I am awake. If she is hungry and the bowl is empty, she will bark.//

//Now, I have never been a big fan of barking dogs. But my dog is getting old, and I will miss her when she is gone. I'd like someone to help me make a robotic dog to replace her. Let's assume that we can create sensors for each condition that affects my real-live dog. How would you connect these sensors to a battery-operated barking machine, so that it would react like Regi does?//

//Start by picking one "barking scenario" and designing that circuit, and then building up from there! When you are done, we will share the circuit with the class.//