This toy is for your cat or dog or other lovely friend that is going absolutely CRAZY to chase a moving object!
With this crazy machine you pull the string away from it ... place the string with the SHINY object at its end in front of the cat ... back off ... and ... press the launch button!
And then what you see is an animal desperate to catch the attractive bow!
Step 1: Lazy Cat in Action
Step 2: How to Launch the Cat?
2: Press the launch button and enjoy the cat orbiting around.
I'm sorry for the blurry photos, but cat is too fast!
Step 3: Parts Supply
LEDs may be skipped, I have them just to make it more interesting.
- A plastic box
- Small DC motor from a toy
- Reel and string
- Battery holder and batteries (holder for two or three 1.5V batteries)
- Cables and heat shrink tubng
- LEDs (optional)
- Labels (optional)
Step 4: Tools Needed
- Drill and bits
- Soldering iron and soldering wire
- Zip ties
- Cable cutters and Pliers
- Hot glue
Step 5: Layout Planning and Connections Circuit
Ensure that the box is large enough to fit the motor, battery holder as well as the switches.
Step 6: Battery Terminals
Because the motor spins too fast at 4.5V, I soldered a cable at the 1.5V spot to have two different speeds for the operation.
NOTE: Use the first positive terminal as shown on the schematic diagram. The negative terminal is common for the two speeds.
Step 7: Motor Connectons and Reel
I used hot glue to attach the reel to the motor axis.
Step 8: Motor Stand
Step 9: Buttons Control
One button changes the speed of the motor, other is the Start/Stop control.
If the box is very soft start with a small bit and progressively increase the size.
Step 10: String Entrance Hole
I used a soft rubber piece to lay over the hole and protect the string from the harder plastic.
Step 11: LED
Step 12: Limit the LED Current
Resistance = Voltage drop on led / Current = 2.5 V / 15 mA = 160 Ohms
160 Ohms resistor is enough to limit the current through the LED to 15 mA.
NOTE: The LED will have sufficient current through it to light it up only when powered at the higher voltage with the resistance in series with it.
Step 13: Mount the LED
Step 14: Soldering Time
All cables are soldered and insulated with heat shrink tubing.
Finally zip ties tidy the mess and the connections look better.
It's a good idea to keep any wires away from the string and reel.
Step 15: Apply Hot Glue
Step 16: Foam to Restrain the Wobbly Bits Around
Could be hot-glued to the box too.
Step 17: Printing Labels
One label is to change the speed from casual walk to astronaut's space travel speed.
Other for the string pull.
Step 18: Roll the String and Voila!!!
I used about 5m of string (15 feet).
I also hang a wrist wrap at the side of the box.
Step 19: Work Hard Play Hard
Comments are very welcome!
For everyone who reproduces this instructable I will give a free 3-month Pro Membership as a reward, just post a photo of your Cat Launcher in the comments below!