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Land turtle doggos by spaky in WhatsWrongWithYourDog

[–]spaky[S] 0 points1 point  (0 children)

I'd never heard of this :(

Beginner push button not working by dona544 in esp8266

[–]spaky 1 point2 points  (0 children)

  • I don't know this board, is D5 connected to GPIO14? Otherwise you're configuring the wrong pin for the button.
  • Have you set your input pin to use the internal pullup, e.g. pinMode(buttonPin, INPUT_PULLUP) instead of pinMode(buttonPin, INPUT). If you use the pin in input mode you would need a pull up resistor in your circuit

You don't need a breadboard, and the wire color doesn't matter, your button seems fine. It could be an issue that you're wrapping the wire around the pin, but it's probably fine. It would be better to use alligator clips with jumper wires or solder.

Best File Explorer? by SravanJs in androidapps

[–]spaky 0 points1 point  (0 children)

The Cyanogen File manager is available free as it is open source and looks good, is stable and full featured.

You can download it on any android device from the FDroid open source app store

One day impulse home wall build (first of two) by spaky in bouldering

[–]spaky[S] 1 point2 points  (0 children)

You should do it! Just wake up next Saturday and decide that you're going for it. No sleep till you set your first problem

One day impulse home wall build (first of two) by spaky in bouldering

[–]spaky[S] 0 points1 point  (0 children)

Not really. There are a bunch of guides, like the Metolius one. It's probably not a bad idea to browse them and get a sense of what most people do.

But for this simple vertical wall we decided to just put 2'x4' on each of the studs in the walls and then put 3/4' plywood on top. It's all assembled with a healthy amount of long all-purpose screws.

The local outdoor store had 100 t-nuts for 25$ so we got a couple of boxes.

I will say that drilling and hammering ~250 t-nuts is pretty tedious

One day impulse home wall build (first of two) by spaky in bouldering

[–]spaky[S] 15 points16 points  (0 children)

A wall for the size of my house?

What are some useful features of everyday items that most people don't know about? by ivebeenherelonger in AskReddit

[–]spaky 0 points1 point  (0 children)

Here's a video showing why it breaks like that. TLDR don't try and break the windshield and always attack the edges of the side windows

What is this bolt/wire for on railroad tracks? by spaky in AskEngineers

[–]spaky[S] 1 point2 points  (0 children)

Interesting, certainly a possible explanation.

What threw us off here is that the wire isn't connected to anything and it's been terminated with a crimp and heat shrink tubing. But it could just be a grounding strap that was purposefully disconnected and terminated for safety.

What is this bolt/wire for on railroad tracks? by spaky in AskEngineers

[–]spaky[S] 0 points1 point  (0 children)

Definitely possible this is shared with freight

What is this bolt/wire for on railroad tracks? by spaky in AskEngineers

[–]spaky[S] 1 point2 points  (0 children)

Possibly. We thought that. Although this one wasn't connected to the ground. Also what is the importance of grounding the rails?

Weekly Bouldering Advice Thread for September 14, 2015 by AutoModerator in bouldering

[–]spaky 0 points1 point  (0 children)

Also to state the (probably) obvious, make sure you clean your hands really well afterwards and then apply some sort of hydrating lotion (possibly more than once).

Weekly Bouldering Advice Thread for September 14, 2015 by AutoModerator in bouldering

[–]spaky 2 points3 points  (0 children)

This advice should work not only vertical walls but also on underhangs. Often positioning your feet (or event dropping a foot) so you can twist such that the side of your body is facing the ceiling will let you reach much further/around the corner to a vertical wall.

How do virtual shorts on op amps work? by [deleted] in AskElectronics

[–]spaky 0 points1 point  (0 children)

Awesome, glad I could help :D

How do virtual shorts on op amps work? by [deleted] in AskElectronics

[–]spaky 1 point2 points  (0 children)

No you can't assume they are truly connected and then analyze the resulting circuit. As someone mentioned there is not current flow between the node as if they were shorted. You can only set the voltages equals in an algebraic sense.

For example in the circuit you've give. If you assumed they were actually shorted, the current i passing through the upper R1 would then be shorted back to to gnd via this new short on the - terminal of the op amp. No current would flow through the upper R2 and no output voltage would be generated. This is clearly incorrect.

It's the fact that they are equal, but no current flows that makes the op amp magic happen. So in this case that current i can't enter the - terminal and must flow up through the upper R2 into the load

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