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by Dark Sabre
February 23rd, 2018, 8:35 pm
Forum: Mission Possible C
Topic: Final Action
Replies: 38
Views: 4335

Re: Final Action

For those of you who have been using those small recordable devices, how have you gotten around the fact that most of them have (lithium) coin batteries? As far as I know, none of those recordable devices run on regular non lithium batteries (although at our regional, the event supervisor didn’t as...
by Dark Sabre
February 21st, 2018, 6:53 pm
Forum: Mission Possible C
Topic: Gas Expansion Task
Replies: 29
Views: 4551

Re: Gas Expansion Task

Has anyone else thought about using a pressure sensor for this task? You would only need to make a minuscule change in pressure so the whole action would go faster. As an electromechanical approach, a differential HVAC vacuum switch might be ideal for that. In the application, they sense the relati...
by Dark Sabre
January 18th, 2018, 6:10 pm
Forum: Mission Possible C
Topic: Balloon Task
Replies: 45
Views: 6722

Re: Balloon Task

Here is one perspective on chemicals and concentration: https://scioly.org/forums/viewtopic.php?f=273&t=10883&p=323289#p323289 But as noted in the other thread where you were asking about this, hydrogen gas isn't going to pass safety either (if that's the direction you were going).
by Dark Sabre
January 18th, 2018, 6:07 pm
Forum: Mission Possible C
Topic: Photoactive Task
Replies: 52
Views: 7003

Re: Photochemical Task

Concerning the "signal light" idea, I appreciate it from the perspective that it does inform the judge that the action is taking place. But the strict interpretation of the rules is that the "scoring" part of the action (per 3.d.) isn't visible, just an arbitrary signal light. I ...
by Dark Sabre
December 30th, 2017, 12:06 pm
Forum: Mission Possible C
Topic: Final Action
Replies: 38
Views: 4335

Re: Final Action

If you design your circuit so that the action grounds the arduino pin, then you can use the integrated INPUT_PULLUP setting (it has internal 20kOhm pullups). In that case then reading will be normally TRUE due to the pullup and change to FALSE when the action grounds that input pin. pinMode(7, INPUT...
by Dark Sabre
November 28th, 2017, 8:49 pm
Forum: Mission Possible C
Topic: Infrared Task
Replies: 21
Views: 5837

Re: Infrared Task

Pulling from Merriam Webster for "beam" a : a ray or shaft of light b : a collection of nearly parallel rays (such as X-rays) or a stream of particles (such as electrons) c : a constant directional radio signal transmitted for the guidance of pilots The definitions a) and b) focus a lot mo...
by Dark Sabre
November 28th, 2017, 8:32 pm
Forum: Mission Possible C
Topic: Mission Possible C
Replies: 505
Views: 56159

Re: Mission Possible C

Well, let's look at it this way: Vinegar (~5% acetic acid, balance water): Here's a random googled MSDS that indicates it is not hazardous and requires no special handling equipment https://www.cos.net.au/msds/SAUC3010.pdf Glacial Acetic acid (100%): Here's a random googled MSDS that incidates you n...
by Dark Sabre
November 22nd, 2017, 8:50 pm
Forum: General Chat
Topic: The [Not So] Official Scioly [non endorsed] e-invitational
Replies: 36
Views: 2560

Re: The [Not So] Official Scioly [non endorsed] e-invitational

I spoke with NSO on this topic specifically to better understand what is allowed and what is not. Here are the key points for what we need to implement here: ⋅ Language like tournament/invitational is not allowed for an online event per NSO policy. ⋅ Online practice is specifical...
by Dark Sabre
November 20th, 2017, 8:51 pm
Forum: Mission Possible C
Topic: Mission Possible C
Replies: 505
Views: 56159

Re: Mission Possible C

The autonomous wording this year is interesting. Last year for example dealt with it the usual way: "After the Start Task, the device must be designed to operate autonomously..." The key word historically being designed to operate autonomously. Accidental stoppages required Touches were pe...
by Dark Sabre
November 16th, 2017, 6:31 pm
Forum: Mission Possible C
Topic: Chemical Clocks
Replies: 89
Views: 9880

Re: Chemical Clocks

Ah, but the button on the recorder is no different from an electric switch (inside the recorder, that's all it is). So if switches are banned, your method also fails. Fair enough, I didn't consider that proposal thoroughly enough. So you could have the timer release the wound spring (uh oh, does th...
by Dark Sabre
November 14th, 2017, 6:42 pm
Forum: Mission Possible C
Topic: Chemical Clocks
Replies: 89
Views: 9880

Re: Chemical Clocks

The Merriam Webster definition of sensor leaves a bit to be desired for deciding what is allowed: a device that responds to a physical stimulus (such as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control) But ...
by Dark Sabre
November 10th, 2017, 7:59 pm
Forum: Mission Possible C
Topic: Water Task
Replies: 45
Views: 5732

Re: Water Task

My personal take on the task description: If I press a switch with my finger, my finger is not completing the circuit because my finger is not a conductor in the circuit. I am pressing a switch. The switch is completing the circuit. If I touch between two high voltage lines, my finger is completing ...
by Dark Sabre
November 1st, 2017, 6:54 pm
Forum: Mission Possible C
Topic: Mission Possible C
Replies: 505
Views: 56159

Re: Mission Possible C

I know most people aren't at the point where they would be worrying about this yet, but I do not see a requirement in the rules for ESs to provide tables. Quite true and some competitions won't have tables. We've judged devices on the floor, on the edge of a stage, and on whatever is available. Wit...
by Dark Sabre
September 30th, 2017, 8:26 pm
Forum: Mission Possible C
Topic: Endothermic Task
Replies: 16
Views: 3642

Re: Endothermic Task

I spent 15 minutes trying to find an old picture before realizing that I'd documented the machine already on the wiki... 2004_DarkSabre_MPC Scroll alllll the way down to step 15 and the line above it as a possible example. You can easily get the chemical cold packs from the grocery store, which at l...
by Dark Sabre
September 30th, 2017, 7:29 pm
Forum: Mission Possible C
Topic: Exothermic Task
Replies: 45
Views: 6596

Re: Exothermic Task

Only my personal thoughts, but... -For concerns with 3.d., I would be satisfied if a competitor had a removable filter placed over the photocell/light arrangement mentioned. The exact construction can be observed with the filter removed and the action can be observed during the run assuming that you...

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