Our hardware is designed to help our students fall asleep more
easily, wake up refreshed and improve concentration. We’re going to do
that by switching vanilla and mint flavors with blue light and red
light, activating menthol synthesis with red light, and vanillin
synthesis with blue light. We will add timers to control which colour
light will be switched on when to switch fragrances as need be. 
Figure 1 is our preliminary hardware concept. On the top
of Figure 1 is a rotating tool connected with a stirring rod. Beside it
is a blue light and a red light with a small fan hanging on the edge.
The blue light and red light can be set on time, in the morning or at
night, the stirring rod is to prevent the yeast from settling, and the
fan next to it is responsible for distributing the fragrance with the
rapid diffusion of the cent out of the device.
In figure
2 we have refined our design from Figure 1. We found that the way we
designed it was too big, not convenient to put next to one’s bed, and
not beautiful. So we went back to the drawing board to address these
issues. 
We wanted to use a clear rectangular
plastic tank for the body, but we found that yeast deposits got stuck in
the corners. Therefore, we chose to use a cylindrical transparent
container as the main body, which can be easily stirred so that the
yeast stay in suspension.
We then redesigned it to be more portable, more suitable for daily use, and to make as little noise as possible Figure 3.
In addition, we also replaced the red and blue light bulbs that were
originally very prominent and occupied space with red and blue LED
lights and placed the LED lights on the side of the transparent plastic
container, saving space and maintaining beauty. By spiraling the lights
around the container we also had better light distribution through the
container. 
We turned the original vertical fan in to a more compact, lightweight,
easy to hide mini computer cooling fan, it had the same effect but uses
less space and makes less noise to ensure people’s sleep quality.
We took the original, single blade bar, and modified it into a two-blade bar, which keeps the yeast from settling on the bottom and keeps the growth medium in constant motion.
We used this mixer, which can be stirred at a constant speed,
to ensure that the yeast does not accumulate and to minimize noise.
We used a timer like this, which allows the red and blue lights to switch on or off when we want them to.
Now that the design improvements are over, it’s time to build the model. We made a model based on our design improvements, and after testing it worked very well. Figure 4
We put the fan on the outside, and we found that it took up a lot of space and it easily fell off, so we changed the design to put it on the top, next to the blender, to achieve the same effect and save space Figure 5.
When the model was finished, we found that its appearance was not very good, and the LED light band on the side will emit light at night, which may affect the quality of people’s sleep. So, we designed a cover around the hardware that was in the shape of a house, with windows that could be turned opened and closed to allow the fragrance to come out. The whole house was made of cardboard to prevent light from passing through and to reduce noise transmission. This design not only ensure the quality of people’s sleep, but also make it look more beautiful, adding fun to our work. Figure 6
Here are some pictures of us working. 
First, he found a well-fitting point, opened a window in the middle that could be opened, and his roof could be opened to replace the equipment inside, or let the fragrance out. There’s also a small hole next to it for the wires to come out.
We painted him to make him look better.
