Picture of Froggy World 1   The Catapult

Froggy World is an amusement park for adventurous frogs. 

This ride is the first in a series.  Each ride receives a signal from the previous ride "You've got the frog;" and each ride signals the next that "Frog has left, you've got the frog." Eventually, the frog will be returned to the catapult (by another ride) and the cycle will repeat.

The concept for winding and releasing the catapult spring comes from Arduino Controlled Catapult by UnusualTravis


Step 1:

Picture of
There is no real "beginning" or "end" to this amusement park, but I had to start somewhere.  The signal on Arduino pin #13 (brought low) will cause this ride to catapult the frog, return to "ready" position and notify the next ride (by a low signal on pin #11) that the frog is now in their hands.

The code "winds" the spring servo, then moves the "release servo."  The spring servo unwinds (catapult falls back to start position) and the "release servo" moves to the latch position.  Then the "frog has left" signal is activated.

#include <Servo.h>


Servo myservo;

Servo release;

int start = 13;

int next = 11;

int val = 0;


void setup ()



pinMode(start, INPUT);

pinMode(next, OUTPUT);

digitalWrite(next, HIGH);





void loop ()










digitalWrite(next, LOW);


digitalWrite(next, HIGH);


AIBalboa241 year ago
oh and also the battery holder only holds 4 AA is there a way to make this work?
MikeTheMaker (author)  AIBalboa241 year ago
4 AA batteries will work (6 volts instead of 7.5). The servo pulling the spring will be slightly less powerful.
Nice work!
J-Five2 years ago
I know what the frog is saying "WEEEEEEEE!!!"
MikeTheMaker (author)  J-Five2 years ago
In the next few days, the frog will "land" and have a new experience :)
By the way, how far can go
MikeTheMaker (author)  J-Five2 years ago
From carpeted floor to carpeted floor--12 to 15 feet. From a table to a tile floor, quite a bit farther.
That's what I thought any plans to make one human size that might be fun.
I better not give you any ideas.
MikeTheMaker (author)  J-Five2 years ago
I can think of a few people who need to ride the human size version . . . "The Boot" (where Froggy lands) is now ready
I would build it if there were any plans.
MikeTheMaker (author)  J-Five2 years ago
I don't know about human riders--but a catapult big enough to fling watermelons could be a treat . . . .
J-Five2 years ago
Don't quote me on this if you lengthen the lever and/or make the spring more compressed you might increase the distance.
J-Five2 years ago
J-Five2 years ago

Even though it should have been called frogapult!!
MikeTheMaker (author)  J-Five2 years ago
I didn't think of that . . . good name!
Marko2382 years ago
Poor froggy :(, but guess it's the only way to get a plastic frog to jump.
MikeTheMaker (author)  Marko2382 years ago
The plastic frogs are excited to have their own amusement park--of course the plastic mice are everywhere in other parks . . .
This is awesome! I'm currently in the process of getting started with C++ and messing around with Arduino, so I'll definitely give this one a shot. Great Instructable!

MikeTheMaker (author)  GorillazMiko2 years ago
Thank you! I can just barely get around in C . . . if you discover any good books on the subject, let me know.
Nice work! This is pretty cool!
MikeTheMaker (author)  SlickSqueegie2 years ago
Thanks! If all goes well, this frog will have a lot of "experiences" before returning to the catapult . . .