If you connect the LDR directly to 5V and the analog pin, there would be no voltage drop across the LDR irrespective of its resistance value. The anal...

Well, I don't know any paid courses related to this but there's an excellent tutorial series on YouTube. Here's the link

You can use a transistor or a Mosfet. You would still need external supply though.

To put it simply, whenever the constant (SENSOR_PIN or LED_PIN) is called inside the program, the compiler replaces it with the defined constant value...

Hi Rashid, Start with Registers first. It's necessary to know about the architecture as well. Here's an excellent video tutorial by Sparkfun. This...

Yes, the current limit per pin is 40 mA(sink/source OR IN/OUT). However, this is the maximum absolute rating and you should not draw this much current...