Endothermic Task

ScottMaurer19
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Re: Endothermic Task

Postby ScottMaurer19 » September 23rd, 2018, 11:03 am

Jacobi wrote:I would take the cautious approach and use an analog-output thermometer.

Even better, use an old fashioned red thermometer plus some sort of photogate to detect when it goes below a certain level.

I don't see how that changes anything... The only difference is that "programmable" may not be part of the electronics description. It would still require some similar method for triggering the next action
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Re: Endothermic Task

Postby satvik » September 30th, 2018, 7:51 pm

can peltier device be used to have the endothermic reaction occur?

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PM2017
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Re: Endothermic Task

Postby PM2017 » October 17th, 2018, 8:35 pm

ScottMaurer19 wrote:
sciolycoach wrote:
ICs that are "resistor programmable" or that can be adjusted using an analog input in a similar fashion should be fine IMO.


But wouldn't this violate rule 3i where it says Programmable components are not allowed? Looks like FAQ time...when it opens of course.

programmable: able to be provided with coded instructions for the automatic performance of a task.
Changing the resistance would be a physical property and I would not view that as a 'coded instruction'


Welp. I'm somewhat annoyed by this latest FAQ
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Re: Endothermic Task

Postby ScottMaurer19 » October 18th, 2018, 4:45 am

PM2017 wrote:
ScottMaurer19 wrote:
sciolycoach wrote:
But wouldn't this violate rule 3i where it says Programmable components are not allowed? Looks like FAQ time...when it opens of course.

programmable: able to be provided with coded instructions for the automatic performance of a task.
Changing the resistance would be a physical property and I would not view that as a 'coded instruction'


Welp. I'm somewhat annoyed by this latest FAQ

It only says that you can't use something marketable as resistance programmable so I don't see why building a similar circuit with a 555 or MOSFET or something similar would be disallowed.
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Re: Endothermic Task

Postby mpnobivucyxtz » November 2nd, 2018, 6:13 am

Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?

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Re: Endothermic Task

Postby TheSquaad » November 2nd, 2018, 6:48 am

mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?


Our team did that exact process last year, and nobody questioned it at the 5 competitions we went to

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Re: Endothermic Task

Postby PM2017 » November 3rd, 2018, 11:39 am

TheSquaad wrote:
mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?


Our team did that exact process last year, and nobody questioned it at the 5 competitions we went to

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Re: Endothermic Task

Postby nmurali2002 » November 4th, 2018, 6:09 am

I'm trying to find a good PTC thermistor, but everything I've seen has an ideal operating temperature of around 25 degrees Celsius. Anyone have a thermistor with a lower ideal temperature? (or a site that lets you sort by curie point).

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Re: Endothermic Task

Postby erico.vert » November 7th, 2018, 4:50 pm

I've seen a lot of peltier devices online but they all say they run at 12 volts. Since this year we can only use 9 volts, would the device still operate just not as well, or would I have to go digging for a 9v one. Also, if someone knows of a 9v one, could you link it please? Much appreciated

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Re: Endothermic Task

Postby cheese » November 7th, 2018, 5:19 pm

Or buy a 5v peltier cooler: https://www.adafruit.com/product/1331
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Re: Endothermic Task

Postby nmurali2002 » November 8th, 2018, 4:05 pm

mpnobivucyxtz wrote:Our team is currently thinking of using a Peltier cooler and detecting the change in the heat with a thermistor. However, I can't figure out whether this would be endothermic. The cooler definitely loses heat so by definition, the thermistor touching it would be gaining heat (so endothermic). Would this be valid or is too much of a stretch?


The rules say "initiates the next action as a result of the reduction in temperature". I suppose that you could say the reduction in temperature of your heat sink causes the increase in temperature of your thermistor?

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Re: Endothermic Task

Postby annabelle0308 » November 26th, 2018, 2:07 pm

Would a baking soda/vinegar balloon count as “endothermic”? I’m not talking about the action where you need to blow up a balloon 20cm, but is the reaction between vinegar and baking soda itself considered endothermic?

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Re: Endothermic Task

Postby TheSquaad » November 26th, 2018, 3:23 pm

annabelle0308 wrote:Would a baking soda/vinegar balloon count as “endothermic”? I’m not talking about the action where you need to blow up a balloon 20cm, but is the reaction between vinegar and baking soda itself considered endothermic?


4bii specifies that for the endothermic action, the next action must be initiated due to a reduction in temperature. A baking soda/vinegar reaction inflates a balloon by producing gas, not by reducing temperature. So using that as an endothermic process would not be legal.

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Re: Endothermic Task

Postby Chikoo10 » January 13th, 2019, 3:00 pm

Does anyone have a link to a good PTC Thermistor that will work with the peltier device?

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Re: Endothermic Task

Postby DarthBuilder » January 13th, 2019, 5:24 pm

I was wondering about that as well
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