Understanding voltage divider and How to use it as voltage sensor - Electronic Basic #3

In this video, I am talking about what is a voltage divider, how it works, and how to use it as a voltage sensor.
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You can find the sketch/code use in the video here:
miliohm.com/un...

[@Ticks_and_Chaos]

Please continue Electronic basic series.🙂

[@ankitkumarshaw9096]

Sir, I want control the voltage using a 10K potentiometer, Vin=12V DC, and Vout= (between 0v-5v) from the potentiometer. So, I need a resistance R1, that will drop the voltage from 12v to 5v, in order to produce Vout = 0v to 5v from the potentiometer.
But I am unable to calculate the R1 resistance value.
Please help me in this.

[@samithetechsavvy6485]

Very well explained, thank you

[@syaputrarama2188]

Sir I want to ask where the values 13 and 3 from the Vin formula come from

[@AS-cy1jt]

just what I was looking for

[@Dinesh-Bhardwaj]

This video is too underrated.

[@miliohm]

Thank you. Really appreciate it!

[@peterlethbridge7859]

Thank you. Excellent video

[@momd6417]

Can you give me the values ​​of the resistors if I want to measure a voltage up to 30v?

[@davidsvarrer8942]

Hey. Why do you not watch this video here, and learn instead? This video here explains it all. So ask questions to the understanding of this video, and I will assist you.

[@nal0007]

Use this formula for voltage divider with 2 values resistors, R1 (top resistor), R2(button one), consider R1 is 10K, Vout is 5 volts (arduino max input voltage ) and Vin (yours 30 volts):
R2= R1*(Vout/Vin-Vout). The result is 2K. Now you can find the values of R2 for any voltage you want.

[@otiknuril4033]

Dear sir, could u tell us about the calculation in arduino programm in detail?

[@adeelprince3150]

Great job 👍 excellent

[@miliohm]

Thank you!

[@Hardeep2dhanjal]

nice video.......thanks

[@nobinobi4768]

dear sir ,can i measure upto 0 to 5 volt directly connect to arduino A0 pin without any voltage divider circuit ?

[@miliohm]

Sure. Just make sure the maximum is 5V

[@nobinobi4768]

@@miliohm yes my maximum voltage is fixed 5volt ,thankyou sir for sharing knowledge. 🙏

[@unglaubichuberlieber8048]

danke danke danke...

[@dredd3220]

Can the code be used in esp32

[@miliohm]

Sure, you just need to make sure the voltage result. Esp32 module only able handle up to 3.3V.
And also don't forget to change the pin you are using.

[@Amperekaefer]

👍.

[@54firepower]

why do I need to multiply by 13 and divide by 3

[@otiknuril4033]

Yeah, i didn't understand too for the calculation in arduino program

[@HenrikHvalpen]

I would like a answer to that too.

[@miliohm]

@@HenrikHvalpen I already explain that on 5:46

[@HenrikHvalpen]

@@miliohm I'm sorry but I still don't get where 13 comes from?

[@miliohm]

@@HenrikHvalpen since the original voltage is multiplied by 3 and divided by 13 (look at the circuit and formula). So the voltage on the arduino should be multiplied by 13 and divided by 3 to get the original value.
The point is multiply the divided voltage, so we can print the original voltage before divided.