Search found 17 matches

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by Xenarian
December 9th, 2010, 8:30 pm
Forum: Mission Possible C
Topic: Circular to Linear Task
Replies: 89
Views: 18873

Re: Circular to Linear Task

I'm just using an electric (non-geared!) motor to wind up some string and raise a mass to hit a switch. That works, I guess. I'm not using any screws or gears, just plain old electric potential.
by Xenarian
December 9th, 2010, 8:28 pm
Forum: Mission Possible C
Topic: Sign Task
Replies: 111
Views: 19829

Re: Sign Task

How much mass have you guys successfully raised with your balloon? I've got as much as 6.9 grams up. That's a lot of points. ^_^
by Xenarian
December 9th, 2010, 8:25 pm
Forum: Mission Possible C
Topic: Blocks Task
Replies: 103
Views: 18522

Re: Blocks Task

Yeah, I'm using a cage sort of thing with blocks on the inside, and pulling it up with a geared motor and string with pulley. I strategically placed some copper tape to connect them all together when the cage falls into upright position. The tricky part was getting the blocks to not entirely stack u...
by Xenarian
November 11th, 2010, 8:18 pm
Forum: Mission Possible C
Topic: Temperature Task
Replies: 123
Views: 21988

Re: Temperature Task

I was planning on using a thermal cutoff switch, that I coincidentally also got at American Science and Surplus. We're probably just going to drop it on some ice and cool it down that way, using it as a "not" gate for the next step.
by Xenarian
March 21st, 2010, 1:22 pm
Forum: Mission Possible C
Topic: Large Competitions & Next Year
Replies: 16
Views: 3814

Re: Large Competitions & Next Year

My IL regionals just went very well. Got a perfect score of 550, with around .2 seconds above the ideal time. YES! State is coming up soon.
by Xenarian
March 11th, 2010, 8:35 pm
Forum: Mission Possible C
Topic: Photocell motor
Replies: 12
Views: 3956

Re: Photocell motor

Um... Well, the problem is that my photoresistor resistance is too high, even in high-light conditions. So I'm putting them in parallel with a lower resistance, after experimenting with some variable resistors. But I figured out why it's not working: somehow little bits of iron got in the gap of my ...
by Xenarian
March 10th, 2010, 4:03 pm
Forum: Mission Possible C
Topic: Photocell motor
Replies: 12
Views: 3956

Re: Photocell motor

Okay, I'm using 2 photocells in parallel with a smaller resistance in series in order to activate a relay.
But it's not working too well. So I'm troubleshooting lately.

But I have all the tasks complete now! I'm excited for regionals in 1.5 weeks.
by Xenarian
March 3rd, 2010, 6:58 pm
Forum: Mission Possible C
Topic: Hydraulics and Pneumatics
Replies: 68
Views: 12946

Re: Hydraulics and Pneumatics

I requested two clarifications a week ago, and haven't gotten responses for either of them!
Where exactly did you guys send your clarification requests? I did to the people listed on my states Olympiad website. I guess that was the wrong place?
by Xenarian
March 3rd, 2010, 6:55 pm
Forum: Mission Possible C
Topic: Last Task
Replies: 17
Views: 4112

Re: Last Task

Okay, well the minimum rating on it is 1.5v. I've tested this thing over two dozen times, and it hasn't burnt out yet. I think I'm good.
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Okay, I'm nice now.
by Xenarian
February 28th, 2010, 4:47 pm
Forum: General Competition
Topic: How large is your SciOly team?
Replies: 41
Views: 2768

How large is your SciOly team?

I go to a small-ish Catholic school, so my team is lucky to scrape together 12 people for our two invitationals. That's our entire team How many invitationals per season do you guys go to? My team went to Loyola and Crystal Lake Central (both in IL). How large/small is your competitor base? With the...
by Xenarian
February 27th, 2010, 7:41 pm
Forum: Mission Possible C
Topic: Last Task
Replies: 17
Views: 4112

Re: Last Task

My science teacher has like 200 of these motors sitting around. So, replaceable. But thanks for the advice.
by Xenarian
February 27th, 2010, 7:40 pm
Forum: Mission Possible C
Topic: Popping the balloon
Replies: 17
Views: 5125

Re: Popping the balloon

I'm using a solenoid, with a pin attached to the moving part. Will later replace this with a scalpel blade, I think. Oh, and a little hint: Use a water balloon. They never specify the size of the balloon, so use a water one such that you end up using less of your precious space on it. But don't fill...
by Xenarian
February 27th, 2010, 7:26 pm
Forum: Mission Possible C
Topic: Last Task
Replies: 17
Views: 4112

Re: Last Task

Yeah, I'm just putting 6v through a 1.5v motor. For some extra torque ^_^

I basically have the motor acting as the fulcrum of a really light 40cm length of basswood, with a minimal, tiny Benet flag on the end. It raises in around two seconds. Made it today.
by Xenarian
February 27th, 2010, 7:14 pm
Forum: Mission Possible C
Topic: Photocell motor
Replies: 12
Views: 3956

Re: Photocell motor

Sounds good...
Must you use a photovoltaic cell (as in solar cell), though?
Would it be legal to use a photoresistor instead?

I was thinking that one could use the photovoltaic cell to power a relay, and close another circuit. Legal?
by Xenarian
February 27th, 2010, 7:52 am
Forum: Mission Possible C
Topic: Photocell motor
Replies: 12
Views: 3956

Re: Photocell motor

I'll get back to you on this one, but I'm experimenting with photoresistors today, in conjunction with motors. I really hate how in the rules they said "photocell", as opposed to "photoresistor". Upon reading it, I immediately thought they meant "photovoltaic cell", as in "solar panel". Then I read ...

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