Hey, I am Tanya Rustogi and I got the idea of the wipes dispenser when I was thinking of how Covid-19 is affecting developing countries. My first thought was that to open a wipes container like lysol you need to touch at least two surfaces which can spread coronavirus. Additionally, having a container of wipes per person in an office or school is not realistic due to the shortage of disinfecting wipes. Then came the idea of an affordable, easy disinfecting wipes dispenser that can be used for classrooms to day cares to shopping carts everywhere.
So what this dispenser does is when an object such as your hand comes within ten centimeters of the sensor, the motor starts moving which is connected to a rod with rolled up wipes on it. The rotation of the motor moves the roll of wipes, causing them to unroll and make their may out of the container.
How to build
So, each of the pins except the ground and vcc on the motor driver are connected to pins on the arduino, which we defined in the code. The trigger and echo pin on the sensor are also connected to the arduino which are defined in the code. Then the ground and vcc of both the motor and the sensor are connected to the ground and vcc of the arduino which is connected to the power. The sensor detects the distance by seeing how long it takes a wave to come back. The code on the arduino makes sure that if the sensor detects something within 10 centimeters of it, it runs the function stepper which causes the motor to run. The container is made from the lysol container, hopefully making it cheaper for developing countries. The container has two holes, one for the wipes to come out from and one for the motor. Then we need to connect the motor to the container which I achieved with tape. The rod connects to the motor which is held on the other side through the hole already provided in the lysol container. Now when the motor rotates, the rod rotates as well.
This is just a prototype, with more material, the final product would look cleaner with a box covering the circuits and the pcbs and circuits connected to the container.
What did I learn
I think the most important thing I learned through this experience is time-management due to the time constraints of two days to make the whole thing as well as perseverance to be able to try again despite how many times the circuit and the code did not work as it was supposed to.