Need help with identifying the resistors/capacitors/etc this guy is using in his breadboard. His Arduino HUB post is linked in the video description (won't let me post the link here for some reason).
In his code, he connects the pulse Pin to pin 3 and the other wire to GND. But I have heard that connecting an INPUT pin to GND could damage the Arduino, so I assume he's using resistors but not 100% which ones.
Thanks.
And the black things?
Also, unsure of placement for those. Wish he had made a diagram. Sorry for my lack of knowledge on this. New to this. 
Thanks for your help.
Let's just forget completely about how that individual did it. Probably, it's wrong anyway.
Just tell us what you have and what you want to do, start from scratch.
And the black things?
Diodes with leads much too big to fit on a breadboard without damaging the breadboard strips.
All I can see is the BRN-RED-ORG is going into the cathode of one diode... more stuff is at the end of that row. It looks like the other resistor is sharing a row with the cathode of the other diode. 
Only if the pin is an OUTPUT and you write HIGH to it
Connecting an Arduino pin to GND is perfectly normal when you use INPUT_PULLUP in the pinMode() for the pin because that is how you change state of the pin from HIGH to LOW to detect say a button press or other switch closure. This is almost what the code associated with the video is doing except that he uses INPUT instead of INPUT_PULLUP and I suspect that the resistors are pullup resistors used in place of INPUT_PULLUP in pinMode(). If so then a value os 10K is about right
Stop listening to hearsay, and consult the original documentation. In the simple switch example tutorials on this site, you will find inputs connecting to ground.
Many hits (videos and sites) on a search:
So if I make the pin INPUT_PULLUP, I won't need an external resistor?
That's right
The "hearsay" was from this site, but was MY misunderstanding of the pin being INPUT or OUTPUT. That's why I asked to learn.
I have what he has and want to do what he did. I just didn't want to mess up the Arduino by frying a pin by mistake. The pulse Pin being a PWM I wanted to make sure it was wired properly since no diagram was given.
Well, lots of pseudo anonymous unsupported online tutorials like that, have circuits that will fry a pin. That is why you need to avoid it and get your info from authoritative sources. When they don't tell you things, it is often to hide the fact that they actually don't know much.
I have what he has and want to do what he did.
According to the forum guidelines, you are supposed to detail all that yourself in the first post. However, it's not too late now.
Thank you for your help and understanding.
But, the forum, right? Not the reference documentation section...
Muted.
If you come here with a closed mind, nothing can get in. Good luck. Added to my ignore list.
I just don't take to people blaming the student for making a mistake they didn't know was a mistake. You're not being helpful, you're being condescending.
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