Today I tried to measure the voltage over some components in a circut, connected to an Arduino. I didn't get it to work. At home I tried this simulator and got even more confused. Can someone explain?
This doesn't give 5V over all components. But if i connect it to the 5V pin, it does. Why?
Also, if I change it to analog output and gives it a value less than 1023, the total voltage is still the same?
Route the wires in a better way, to make it visible how everything is connected, make the GND black, use the same color for the same voltage and tell what value the resistors are.
An output from D13 to GND may not be read as 5v due to the load you put on the D13 pin.
Your two right meters in the image should be reversed as they are reading a negative voltage as is.
The two meter readings on the right added together add up to the voltage seen on left meter.
Which analog output?
You have connected the resistor to the pin 13 that's why it decrease the power secondly if you connect wire to direct 5v it has the Main and original power which passes to another pin Thirdly if you do the same without connecting the resistor you will able to see that it is passing around 4.7v . And I suppose you are using Tinkercad as a online simulator for the Same isn't it ? I am also using the same and the ss attached is only from there pls find it
Which Analog output as I have connected to A0 and it is showing 5V
The specs for the chip say output-high should be at least 4.1V and output-low should be 1V or less (at Vcc= 5V and a 20mA load).
On an input pin, anything less than 1.5V will read low and anything greater than 3.5V will read high (again at Vcc=5V). Anything in-between is undefined and might read high or low.
This way, you can connect an output to an input and the ones & zeros will ALWAYS be read correctly.
The regular Arduino doesn't have true-analog outputs. It's PWM. It will be near 0V at 0% PWM, near 5V at 100% PWM, and at 50% it's high half the time so the average will be near 2.5V, but the Arduino doesn't automatically average and multimeters are unpredictable with PWM too.
Okay. Thanks everyone.
So it's just pin 3,6,9,10 and 11 that can take analogWrite? And I thought it scaled to 1023 but it's actually 255? I've seen many videos that used 1023 to convert it to volts tho.
And I understand why the digitalWrite doesn't have to be accurate to function as it should.
Yes, correct, and also pin 5.
The analogRead() function has no connection with analogWrite().
The analogRead() returns 0...1023, but it can also be 0...4095 with a Arduino board that has a 12-bit analog value.
The analogWrite() has been defined as 0...255, because a PWM with only 256 steps is easier to make.
The voltage depends on the Arduino board and the computer and the USB cable.
Some boards have a voltage that is very close to 5.0V.
The Arduino Nano has a voltage that is often between 4.3V and 4.5V.
What Tinkercad is doing, well, they do their own thing.
Because not every pin can use the analogWrite() for the PWM output, it is documented for every board. The Arduino Uno has a ~ label for a pin that can do a PWM output.
Thanks a lot! 
Your Welcome @pierresparf #using-arduino
