Arduino Uno R4 WiFi LESSON 13: Dimmable LED Controlled by a Potentiometer

Pick your Sunfounder kit up so you get the same results I do:

You can pick up the neat jumper wires I showed in the video here:

You guys can help me out over at Patreon, and that will help me keep my gear updated, and help me keep this quality content coming:

In this video I show you how to create a dimmable LED controlled by a potentiometer. I will show you how to build the circuit, do the math, and code the solution. Enjoy!

#arduinor4wifi
#potentiometer
#tutorial

[andrewhodson]

Hi Paul, I got it working but took a few rewinds in the lesson to understand the concept! At 63, it's been a few years, around 45 of them, with working with the power concept!

[larryb]

I am Legend. Double chest bump. On the 2nd time after a commit from a viewer. Thanks to Keith reminding me to do some more math.

[qzorn]

These math examples are priceless. This technique would help on some non-linear sensor signals. Thank you Paul.

[louistoweill]

After seeing Paul's solution, I also ran the circuit with a base e logarithmic simulation and it also worked well. I have learned a neat idea from this lesson. Thank you, Paul.

[ryanholt]

Great work Paul, the community appreciates the work you do!

[hammermekanik]

I absolutely love the view from your backyard, such a calming backdrop to aid in the absorption of technical material. I wish I could have it on my PC background to stare at when solving problems. Congrats on achieving this. And of course, im still loving the classes when I can get enough time to complete one. Please dont stop.

[steveholt]

Another good one, getting better all the time!

[LeHossainy]

Hi Mr. Paul. First, I want to say thank you for your efforts, and I have few questions I hope you answer them.
1- which board do you think is the Most suitable to build a quadcopter (Stm32- raspberry pi pico /4- arduino uno /mega) please note that this drone will handle heavy tasks and It will contain GPS and handle a fpv camera and will be able to cut 10 km as range ( using the Lora modules or a specific type of nrf ( I forgot it 😁)
2- do you think learning on the hardware development boards is enough to become an expert or you should learn how to work with a pure microcontroller such as (Pic series) with a compiler
Thank you❤

[sumeetchaudhary]

Hello Paul, can you do some lessons using the wifi module of the board such as using the browser of my computer to toggle the LED on the board

[xaninator]

I plugged my led directly to the output of the potentiometer, and connected it to ground. I turned the dial up, it got bright, then POP! I forgot the resistor hahahahahaha

[DrDave]

Correction on my homework after watching your lesson: I should have calculated the potVal 0-1023, not 0-1024. Thanks for your attention to detail, Paul!

[masmanst]

Lesson 12 homework, digitalWrite instead of analogWrite folded up my lawn chair. More than a hour before the led went off or in this case on.

[akselhansen]

I think there is an minor error in the calculations between potval and writeVal..

One has 1024 numbers and the other 256. Just divide by 4.... no fraction....

[FreidonNasrat]

sorry guys I made a mistake i scheduled my YouTube and links for tomorrow at midnight.

[robertschuldenfrei]

Problems getting the comment to stick in Lesson 12. Maybe it will stick here. Here is the homework for Lesson 12: