Kris and I decided to make a robot jellyfish that can control the height after watching the beautiful jellyfish movement on YouTube like this.

However, it is kind of hard to keep the micro: bit board dry under the water. And also, we thought it will be more fascinating if the jellyfish can swimming in the air, we decided to make it as a flying robot jellyfish.

How Will We Make It

1. structure
We decided to make jellyfish-like double-layer membrane filled with helium to make it able to maintain its position in the sky without falling down. (It is mainly to save power, else the propulsion part will have to keep running)

2. control
We decided to use micro: bit with robotbit as before. In addition, we need a voltage transformer this time to support our propulsion part.

3. movement
The most exciting case, also the most difficult one, is that we will design, test and make special Electroactive Polymers (EAPs). It is a material that will shrink sharply when receiving electrical current or field. So, it can act as artificial muscle to simulate in inhalation and exhalation (propulsion) of jellyfish.
After researching, we discovered a way to make it: using a PDMS membrane and Graphene.
However, as EAPs material is advanced material science, there are chances that the result might be not as we expected. So I prepared a backup plan: just using helicopter fans to propel it.

4. power
Currently, we have 3 options:
a. use battery (most simple, but might be heavy and not good looking for the jellyfish)
b. wireless power (requires some extra knowledge technologies and experiments)
c. solar power board (expensive)

5. detailed modification
Mainly decoration, testing, programming and changing argument in software.

Source