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### Topic: 220 Ohm resistor. But 1W, 1/2W, or 1/4W ? Help me spend \$18 (Read 5489 times)previous topic - next topic

#### larryd

#15
##### Jun 20, 2016, 07:26 pmLast Edit: Jun 20, 2016, 08:47 pm by LarryD
Quote
That's a great walk through. I have no idea why I was making it so complicated. I mean I hate math, but c'mon. It's just simple division? Why do they go and make it all complicated looking? I hope there isn't a ton of math in this. I know it's hard to be smart without knowing math but I can write code, and I thought that was what I would be doing. Why do I always get sidetracked like this? Just to be safe, I'll dig out a calculator.

Don't run away from things you have trouble with!

Another thing you might want to get are some 'logic level MOSFETs'
Search this site for discussions about them.
Basically they can be used with the voltage level (5volts) found on the outputs of a 5 volt UNO.

Watch these, don't get hung up on the math.

What the heck, watch them all:

Spend two or three days watching tutorials, but, buy some pizza and beer first.

.

No technical PMs.
If you need clarification, ask for help.

#### larryd

#16
##### Jun 20, 2016, 08:05 pm
Here are some typical circuits for inputs and outputs, print them out for reference:

No technical PMs.
If you need clarification, ask for help.

#### TheRealVictor

#17
##### Jun 21, 2016, 04:08 pm
I appreciate the help guys. It was getting ridiculous having to google every  little thing I came across.  It was becoming a really bad rabbit hole. I needed help breaking the loop

thanks for the cool stuff. Ill get started on the vids.

Here is where I am at with my project. Is there a tutorial that will get me a bunch of leds fading in and out?

#### TheRealVictor

#18
##### Jun 21, 2016, 04:26 pm
I have an idea what the diagrams are but I need to know what an external pull down is.  I'll find out. Im doing the mosfet next.

#### Grumpy_Mike

#19
##### Jun 21, 2016, 04:50 pm
Quote
an external pull down
A resistor that is external to the processor, that is one you add, than goes from the input pin to ground. Generally a bad idea, see:-

http://www.thebox.myzen.co.uk/Tutorial/Inputs.html

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