555-Timer-Ball-Whacker.pdf

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555 Timer Ball Whacker
555 Timer Ball Whacker
Written By: Steve Hobley
PARTS:
Servo Motor (1)
from an RC plane/boat/car shop
Breadboard (1)
from RadioShack
Resistor (1)
from RadioShack.
Photoresistor (1)
from RadioShack.
Diodes (1)
from RadioShack.
Desk lamp (1)
Plywood (1)
1/4".
Polystyrene ball (1)
or other lightweight, swattable object.
Carriage bolt (1)
4".
Batteries (3)
from RadioShack.
Battery Holder 3XAAA (1)
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Page 1 of 6
555 Timer Ball Whacker
from RadioShack.
555 Timer IC (1)
from RadioShack.
Electrolytic Capacitor 1.0uF (1)
from RadioShack
Electrolytic Capacitor 1000uF (1)
from RadioShack
Jeweler's wire (1)
SUMMARY
This project uses a simple 555 timer chip and a feedback loop to control a servo-controlled
wooden arm. Whenever an object comes close to a photosensor mounted on the end of the
arm, it blocks the amount of light detected, which triggers the arm to swat the object away.
Check out more
Weekend Projects.
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555 Timer Ball Whacker
Step 1 — Create the Stand
I designed a simple frame to hold all the parts, cut from 1/4" birch plywood.
For this design, you can use a 4" carriage bolt across the top, from which gold wire and
thread can be tied to suspend the "ball," in this case, a plastic egg.
Here's a simple template that can be used to cut out your own stand. Feel free to tweak it
to your liking.
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555 Timer Ball Whacker
Step 2 — Populate the Breadboard
Install the 555 timer on the breadboard, straddling the central "trench."
Add the resistors: 1.5kΩ (Brown-Green-Red-Gold), 47kΩ (Yellow-Violet-Orange-Gold),
15kΩ (Brown-Green-Orange-Gold), 2.2kΩ (Red-Red-Red-Gold), 10kΩ (Brown-Black-
Orange-Gold)
Add the 1000 F and 1 F capacitors. These are polarized and need to go in the
right way around.
Add the diode. This is also polarized and needs to go in the right way around.
The schematic here shows all of the connections.
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555 Timer Ball Whacker
Step 3 — Connect the Offboard Components
Wire up the servo's red (+5v), black (Gnd), and yellow (Control) connections from the
circuit on the breadboard.
Connect the photoresistor (aka light-dependent resistor or LDR) to the circuit using wires
long enough to reach up the wooden arm.
Drill a small hole in the end of the arm to hold the photodiode and insert it. Tape the wires
down the arm to the breadboard.
Attach the wooden arm to the servomotor such that it leans slightly away from the ball.
Mount the breadboard and servomotor onto the stand.
Connect the battery holder to the power and ground rails along the sides of the breadboard.
The connections you may not be able to see on the breadboard (second photo) are:
Diode to Pin 6 of the IC, large cap between +5V and the 6th column of holes, small
cap between Ground and Pin 2 of the IC.
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