Step 1: Simple Circuit Games Unit 3: Operation Game
In this project, you will build your own Operation game from foam board, wire, and basic electronic components, including a buzzer and an LED. In Challenge 1, you will set up the game board. In Challenge 2, you will make the electrical connections and try your hand at performing operations on your patient!
Step 2: Challenge 1: Construct the Game Board
Step 3: Collecting Your Components
Part Quantity Description
A 1 Battery pack
B 4 Rechargeable batteries (AA)
C 1 LED
D 1 Buzzer
E 2 Foam board (approx. 6-inch by 11-inch pieces)
F 1 Resistor (390 Ohm)
G 2 Spools, insulated wire (1 black and 1 red)
H 1 Aluminum foil (approx. 12-inch by 24-inch piece)
I 1 Tweezers
J 3 Machine screws (1/2-inch, 4-40)
K 3 Machine screw nuts (4-40) and washers
L 1 Battery lead extender and two-prong header
Step 4: Tools
Tool Quantity Description
A 1 Utility knife
B 1 Cutting mat
C 1 T square
D 1 Screwdriver
E 1 Glue stick
F 1 Wire stripper
Step 5: Printing Out the Patient Image
Step 6: Cutting Out the Top Panel
NOTE: The size of the top panel should be the same width as your patient image, but 2 inches longer. If you are using your own image, adjust the size of your top panel accordingly.
1. Mark your measurements on the foam board.
2. Make your cuts with the utility knife, using the cutting mat to protect your work surface, as shown in Figure.
NOTE: Use a metal straight edge as well as a new sharp blade to avoid the blade catching on the foam board.
Step 7: Applying the Patient Image
1. Apply a thin layer of glue to the back of your image, as shown in Figure. Be sure to cover the entire surface evenly.
2. Press the image into place, aligning the bottom edge of the image with the bottom edge of your top panel, as shown in Figure.
NOTE: There should be about 2 inches of uncovered space at the top of the panel.
Step 8: Cutting Out Sections of the Top Panel
1. Make an outline around your patient's operation sites, as shown in Figure.
NOTE: The spots that are pre-marked on the "Cavity Sam" image are a bit too small; you should make yours a little larger, as shown.
2. Trace an outline of the buzzer on the area of the panel above the patient's head, as shown in Figure. The outline should be tight and precise, so that the buzzer will fit snugly in the opening.
3. Mark a small circular opening- about 1/2 inch in diameter- along the right side of the board, at the level of your patient's shoulder, as shown in Figure.
4. Cut out each of your marked pieces, as shown in Figure. NOTE: Be very careful not to cut outside your marks, and not to cut your finger!
Step 9: About Conductors, Insulators, and Resistors
Step 10: Adding the Bottom Panel
1. Cut out your bottom panel, making it about 4 inches shorter than your top panel.
2. Wrap your bottom panel in a smooth layer of aluminum foil, as shown in Figure. Tape the foil in place, if necessary.
3. Test fit your bottom panel to make sure that it provides backing for all of your patient's operation openings, as shown in Figure.
NOTE: The bottom panel should also be visible in the hole for the battery lead, but not reach as high as the patient's nose.
4. Glue the top panel to the bottom panel, as shown in Figure.
Step 11: Challenge 2: Build the Game Circuit
Step 12: Adding the Buzzer and Terminals
1. Press fit the buzzer into the rectangular opening in the game's top panel.
2. Add the three machine screws, securing each with a washer on top and a nut on the bottom, as shown in Figure.
Step 13: Adding the LED
1. Using a screwdriver or other tool, make a small puncture in the top panel where you want to position the LED.
NOTE: The LED cannot be positioned anywhere where it touches the foil-wrapped bottom panel.
2. Push the LED's pins through the top panel and bend them apart slightly to secure the LED in place, as shown in Figure.
Step 14: Wiring the Battery Pack and Buzzer
1. Connect the red battery lead to the machine screw that comes through the foil-wrapped bottom layer, as shown in Figure.
2. Connect the black battery lead and the black buzzer wire to the machine screw in the board's upper-left corner, as shown.
3. Connect the red battery lead to the remaining machine screw, as shown.
Step 15: Wiring the LED
1. Connect short lengths of black and red wire to the terminals to the left and right of the buzzer, as shown in Figure.
2. Twist together one end of the 390-Ohm resistor with the loose end of the black wire, and twist together the other end of the resistor with the LED's ground pin, as shown.
3. Twist together the loose end of the red wire with the LED's power pin, as shown.
Step 16: About Parallel and Series Circuits
In the series circuit, both components are connected in a row, with electricity passing first through one then the other. In the parallel circuit, electricity passes through both components at the same time. A major advantage of parallel circuits is that if one component malfunctions, the other continues to function. In a series circuit, when one component breaks, both components stop working, as shown in Figure.
Step 17: Connecting the Tweezers
1. Connect one end of the length of red wire to the machine screw, as shown in Figure below.
2. Connect the other end to the base of the tweezers, as shown.
Step 18: Inserting Game Pieces and Playing the Game
1. Insert game pieces into each operation site on your patient.
2. Move the power switch on your battery pack to the ON position.
3. Try to retrieve the game pieces from the patient. If you accidentally touch the patient, the buzzer should sound and the LED should light, as shown in Figure below.