Instructables

Candypult--Computer Controlled Candy Catapult

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Picture of Candypult--Computer Controlled Candy Catapult
 

 

 
This project is designed to appeal to people who like candy and are lazy--a large group (in more ways than one?).

An electrically powered catapult automatically loads a piece of candy from the tower dispenser.  Upon command from the radio control, the rotating base swings to point in the desired direction.  Push another button and the candy is fired toward the recipient--then the catapult reloads.

I'm toying with the idea of making a few of these available through a "Kickstarter" project--any comments?

For extra credit, you can build the "clap controlled catapult" (start at step #31)



 


 
 
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Step 1:

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Let's start with the parts list and schematic.

Parts:
Arduino
(2) Hitec HS-311 servo motors (Amazon.com)
(1) Hitec HS-645MG servo motor (high torque)--Amazon.com
(1) mini Servo YKS SG90 (Amazon.com)
(1) Two channel remote control toy--I got a car for $11.99 at a local pharmacy
(3) 5 volt relays--Jameco.com #139977 (these are polarized so that positive voltage on one coil lead causes it to pick up, but the other polarity doesn't; you can produce the same result with a 5 volt relay and a diode.  Relays "B" and "C" only operate one at a time--based on the polarity provided.)
1/4" x 3 1/4" x .025 spring (available at Lowes)
(6) 12" servo extension cables
Spring from a ballpoint pen
4" lazy susan http://www.amazon.com/Capacity-Bearing-Turntable-Bearings-VXB/dp/B002TIKEQ6/ref=sr_1_2?ie=UTF8&qid=1372692771&sr=8-2&keywords=lazy+susan+4+inch
9 volt, 500 ma DC power supply
6 volt, 1 amp DC power supply
3D printed parts, design and print files at:
http://www.thingiverse.com/thing:110350
Wood, screws,paint, wire, jumpers

Step 2:

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catapult05.jpg
Start with a 17" x 18" x 1/2 inch piece of plywood.  Paint it red.  Cut yellow circles from a craft foam sheet and glue them randomly to the board (leaving spaces where things will be mounted).

Take a 4" x 15" x 1/2 inch piece of plywood and paint it orange.  Diagonally wrap painters tape to make the stripes.

Step 3:

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Insert a servo motor into the rotating base plate.

Step 4:

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Drill holes and secure the servo with 2-56 x 1/2" machine screws.

Step 5:

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catapult03.jpg
Add a lazy susan bearing (4 inch) to the base using 4-40 x 3/4" machine screws.
PeckLauros7 months ago
Well done! Five stars!
MikeTheMaker (author)  PeckLauros7 months ago
Thank you--it was fun!
ptipirneni1 year ago
This is awesome. There's a good chance i would go for it if you put it on Kickstarter. But I'm not a good proxy for market research. I can't help myself from bidding on that site.
MikeTheMaker (author)  ptipirneni1 year ago
Thank you for your enthusiasm! I'm not seeing a high interest level right now, but I'm encouragedby your words :)