The requirement for this week was to have a working module of our final project to present. Since we switched our project the previous week we had to come up with a project and get it working in a relatively short amount of time. We presented an array of extended core electromagnets which were turned on in response to changes in light. The magnets were made with lag bolts and the enameled wire coils that were taken out of transformers. Each magnet was paired with a photoresistor and turned on when a shadow was over it. This is a view from the bottom of our module showing the electromagnets and relays:
This is a side view of the fully assembled module with the ferrofluid in it. The spikes are the threads of the lag bolts which were used as the core of the electromagnets.
A spiral of ferrofluid formed by turning on one of the electromagnets:
We had a small problem with leaking ferrofluid since the heat produced by the electromagnet heated the silicone seals we used. We plan on finding a more reliable sealant for the final and using drip pans as backup.
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