Arduino Tutorial 10: Understanding How To Read Analog Voltage using analogRead Command

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In this lesson we show step by step how to read analog voltages using the Arduino. We show how to convert the read values to actual voltages.

You can pick up an improved version of my Digital Volt Meter Here:

You can get the following Elegoo kit, to follow these lessons and play along at home

You can get more details of this lesson on our WEB site HERE:

#Arduino

[Tirso]

Can’t believe all his tutorials are free.. I’m learning heaps from you good sir...Thank you..

[benh]

I don't understand how you can just post an entire course on youtube for free and have it be this comprehensive and compellingly taught. I can't thank you enough for the work you do! Starting up a little arduino project and am learning so much from this series.

[Bob-zgzf]

I'm really jealous, coz I didn't have such an excellent teacher like Paul. How lucky are his students!

[klrwhizkid]

Building the circuits and going through the motions are an essential part of training as is taking notes. The more ways our brain is engaged (hearing, seeing, and touching) the better the learning sticks. I was a Technical Training Instructor for Toyota Motor Company for 32+ years. Paul, you are doing good work!

[TheSilvacelso]

I am a new Arduino student and would like to thank you for these good lessons... Very clear and well explained. Thank you

[peterlee]

I am a senior electrical engineering student and I am having more fun/ learning more from your videos than I have in any lab I have taken in the last 3 1/2 years. Thank you so much for creating these videos, I feel like I've been introduced to a whole new world of electronics and I'm really excited about it again. COVID online school has killed my motivation and desire to learn about electronics, but your videos are making me want to know more and more.

[abdelhassibdad]

hi paul i have updated your code to print both V1(R1) and V2(R2) here is the programme
int readpin=A3;
float readval;
float V1=0;
float V2=0;
int delayTime=500;

void setup() {
// put your setup code here, to run once:
pinMode(readpin, INPUT);
Serial.begin(9600);
}

void loop() {
// put your main code here, to run repeatedly:
readval=analogRead(readpin);
V2=readval*0.0048875855;
V1=5-V2;
Serial.println(V2);
Serial.println(V1);
delay(delayTime);
}
the result was: v1=3.84
V2=1.16


thank you for videos

[velgameinc]

I bought my Arduino about 2 week ago, and right now I'm in lessons 10. I followed his tutorial step by step and also successfully completed every assignment given.
I just wanna thanks you for this awesome tutorial, your accent is also very clear and understandable.
I will continue

[tatereinke]

He’s like the bob ross of electronics
“Happy little color”

[yangsophia]

I love your tutorials! I am a ninth grader in Shanghai, China and I am learning this course at school as a PBL class. You teach better than any teachers I've ever seen! Thanks ALOT! I have a test next week on this topic, and I am really benefiting from these tutorials!

[sanspeur]

1.16V bang on! Recently got the Elegoo for my birthday...and I am soooo pleased I've found Paul McWhorter's tutorials!!! I get up the next day wanting more lessons!! Studied electronics over 30 years ago and I've leant more in 10 lessons from Paul...and I'm running frantic 'cause there is no ice in the freezer! This guy is ACE!

[edinfific]

The best thing about this video is that you type every line of the code on the go, you explain what it is, what it does and what it means and you point out the common mistakes in the code.
Others typically just show the code and point to a couple parts of it, which doesn't help someone who doesn't know or understand the code.

[brianmock]

Nooo, you are NOT boring me with the theory part. For me this is the meat of the lessons. My 6 year son is doing the breadbording as you go so he is also happy. Good stuff!

[thomasheisler]

I am building right along side you Paul, and I am having fun learning something new and somewhat out of my element. Thanks man for such a great video.

[billgervais]

You asked us new users to comment on if we do the assignments or not. I am on Tutorial 10 and have done all the assignments so far. Some times it will take me a couple of hours to have things working as they should.
Thanks
PS I am over 65 years old so you can teach an old dog a new trick

[stevewinchester]

I’m enjoying these tutorials a whole lot. What an incredible gift back to your worldwide community. Thanks Paul!!

[rickhartnett]

Yes, I build along during the class. This was a 4 times class. I had to watch it four times to get most everything out of it to understand the new concepts. As we progress I have to re-watch the classes even more times. I find the homework very helpful in reinforcing what I have learned.

[evierma]

As a teacher I am very thankful for these videos. They are a great resource, my students get a break from me, I know they are in good hands. A win, win situation.

[niranjansharma]

I am in my first year Engineering. We solved such questions in middle school but never had any hands on experience. Following you and doing exactly what you are doing is really helping me understand what we used to just write in our notebooks.

[keithdunsdon]

I am 70+ and new to Arduino and electronics, many thanks for the straight forward and excellent tutorials