a)
Why is he applying a resistor onto the board?
I tried it without a resistor ---> the LED = on.
I removed the connection to "Pin 8", which also lead to LED=on.
b)
Are all pins on the mainboard on "HIGH"?
I dont really believe that, though why is the LED on then?
The creator of this tutorial wants to dim the LED with a number of steps.
He switches the LED on the Board and grounds the shorter Pin (makes sense so far).
But then he is using a resistor, to connect the circuit of the LED with the pin.
Im wondering here, because he used the LED at the timestamp before without a resistor.
What is it, what im missing.
If u have any help to offer, or any ideas why he did that, i am very glad if you will share your knowledge.
I can't view the videos - but LEDs should always be in series with a resistor (or other mechanism of current limiting, such as a chip that provides constant current drive). It doesn't matter which side of the LED the resistor is on, as long as it's in series with the LED - but you need something to limit the current going through the LED, otherwise it will burn out (or burn out the pin on your Arduino that's driving it - that can happen too).
Most likely, there was a resistor, and you just didn't see it - else, the LED would have probably burned out almost immediately.
Grumpy_Mike:
If he uses an LED without a resistor you are missing the fact that he is an idiot.
He says you don't need to use a resistor with an LED on pin 13 because there is "already one on the internal LED". I guess he never bothered to confirm that on the schematic.
Though im still lost, why the circuit is not working with the resistor next to the button.
If i remove the resistor or the connection to "Pin 8", which records the outgoing signal of the button, the LED is ON.
Do you guys know why that happens?
Maybe you already answered that question, though i cannot connect the dots. As i told you, i am new and want to learn the principles.
P.S.:
Do you know some good tutorials, which would you prefer to give to newbies?
As u find my posted Tutorial for bad?
Did you read the link I posted on inputs?
If that does not answer your question then sketch a circuit of what you have that didn't work on paper and post a photograph of it.