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For my undergraduate senior project, my team and I designed an electric trash can that assists people taking out heavy trash cans down steep driveways. The motivation to create the Waste Wizard originated from my mom not being able to take out the trash down our extremely steep driveway. Therefore, our team designed a trash can that slows down the maneuver by attaching two low rpm motors to the wheels. The user activates the motors by pressing the two buttons the handles and then the chain drive system will slowly move the trash can forward or backward. The Waste Wizard includes more features that improve visibility at night, forward or reverse movement, and battery life display.
Design
Design
The design for the Waste Wizard focused on three main characteristics safety, user-friendly, and durability. With these focuses in mind our first priority was to ensure that the trash can will slowly and safely move down the hill. Therefore, to achieve a slow movement we attached two brushed DC worm gear motors to each of the wheel axles. The motors were low enough RPM to obtain the speed we desired. Furthermore, the worm gear configuration acts as brakes to stop the entire drive train by deactivating the motors.
The Waste Wizard also includes an LED strip that illuminates the ground around the trash can to improve visibility at night. The wheels on the trash can are slip resistant to make sure taking out the trash in the rain is as safe as possible.
Control Panel
Control Panel
The control panel is design to allow the user to activate the motors, turn on the lights, and adjust the direction to forward or reverse. The buttons in the middle activate each individual motor. Therefore, if the user wants to turn they press the corresponding button for the direction desired. To adjust the direction of movement the user can flip the double pole double throw switch on, which is on right side of the control panel.
DC motors
DC motors
The motors in the Waste Wizard are DC brushed worm gear motors. The motors reach full capability at 24 volts with 60 RPM and 6 N-M torque. The worm gear configuration allows the trash can to brake when the motors are deactivated. Each motor is attached to a separate axle using a drive chain system. The motor mounts were 3D printed and designed using SOLIDWORKS to ensure they would be secure in the unique layout
Battery Pack
Battery Pack
The battery pack we built for the Waste Wizard includes Samsung 25R 2500 mAh 18650's in a 6 series and 3 parallel configuration to obtain 24 volts. The battery pack has a battery management system that allows the user to charge the trash can from a wall outlet. The battery pack powers the entire trash can and will only need to be charged once a month. The battery pack kit we bought allowed us to easily configure our cells without using a welder.
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