Magnets, how do they work? - Tactical Ninja
Sep. 17th, 2013
09:03 am - Magnets, how do they work?
Last night I planted some seeds. I have no idea if they'll grow, the only time I've really grown stuff from seed was in commercial conditions - I can grow courgettes like a boss - or clandestine conditions, or in horticulture at school when we grew peas and beans. Oh, and I think I did one of those sponge-and-grass seed things once:
So we shall see. Then I sat down with Dr Wheel and Socrates and some electronic gubbins, and made magic happen.
So what that is, is Dr Wheel waving a cupboard door magnet at a hall effect sensor, which is sending data to an Arduino, which is in turn telling the LED to get brighter or dimmer according to the proximity of the magnet to the sensor.
This is all running on a breadboard, but when it's complete the magnet will be embedded in a ring, and the sensor will be on Yorick's shaft, so that when the wearer of the ring holds the staff, the LEDs in the eyes of the skill will light up. And they'll only do it for the wearer of the ring.
Or anyone else who happens to have a magnet attached to their hand. *cough*
Now, ideally I'd like it to be more responsive - the magnet is having to get within 7-8cm of the sensor to get a response at the moment, and I'd like to have it responding at about 15-20cm. However, I do understand that with magnets, for twice the distance I'll need four times as strong a magnet because *insert maths here*.
I have investigated rare earth magnets, but everything I've read suggests not putting them in jewellery because they are indiscriminate about what they attract to (think, car doors, fridges, anything made of steel), and because they are so strong they can cause injury. I quite like pombagira and would like not to be responsible for ripping her finger off, so I'm trying to avoid them.
And here's where I'm hoping for advice. Anyone know where I can get a strong normal type magnet that's about 1cm in diameter and about 0.5cm thick?
Meanhwile, Pronunciation Book is now down to Day 8, and the spectrogram made from the videos is nearly complete. Here it is:
More speculation here. Personally I am struck by the similarity between this and the suited faceless character that has come to symbolise Anonymous. I guess we'll know in 9 days.