Sledge Hammer


The Sledge Hammer model is based on the world's only HUSS Jump2 at Canada's Wonderland.

The vertical lifting motion is created by five 12v motors moving a linear gear (rack) connected to a steel rod. To prevent the rack from crashing into the very bottom, a stopper slides into place when the cycle begins and is where the rack lands at the bottom of each drop. At the end of the cycle, the stopper slides away, allowing the gondolas to lower to the platform level. The rack's position is monitored with limit switches and hall effect sensors. The gondolas are equipped with two servo motors each to rotate the gondolas and to control the tilt angle. Each gondola also has a hall effect sensor to establish their home position. The main hub rotation is powered by two 12v motors and also uses hall effect sensors for homing.

Technical Specs & Info


From Platform to Top:  832mm
From Ground to Top:  922mm


Arduino Mega 2560: Main controller that coordinates with other controllers, as well as responsible for various sensors, vertical movement motors, and main hub rotation motors.

Arduino Mega 2560: Hub controller that is responsible for gondola tilt, rotations, and home positions.

Atmega328: Control panel controller that is responsible for displaying messages on the panel display and to communicate button presses to the main controller. (This has been removed as of February 2024.)

HC-05 Bluetooth: Establishes wireless communication between the main controller and the hub controller.


9g Servos (180º): Gondola tilt, Rack stopper.

9g Servos (Continuous rotation): Gondola rotation.

12v 100RPM: Hub rotation (2)

12v 100RPM: Vertical lift (5)


Hall Effect: Main hub home position, Gondola home positions, Vertical height feedback.

Limit Switches: Vertical height feedback, Rack stopper position.


5v 2A Power Supply: Controls.

5v 6A Power Supply: Gondola motors, Rack stopper motor.

12v 5A Power Supply: Vertical lift motors, Main hub rotation motors.

Relays are used with the 5v6A and 12v5A power supplies (essentially all power to the motors) so that power can be cut through programming when the motors are not in use.


Project Dates

This project began in January 2022 and is still in progress.

Construction Timeline