QuinLED history

ESP8266 LED Lighting: Revisit and history of QuinLED

It’s been about 1,5 to 2 years since I started the project to create my own wirelessly controlled PWM LED dimmer. Since that time I’ve kept refining the PCB and code and this post will be a sort of revisit and revision history of QuinLED.

In future posts and videos we will be doing a new tutorial on what components you need, how to solder it all together, program the ESP8266 and link it to Domoticz. I also plan to create posts about the LED Power wall I’m going to build to house everything centralized in my house.

More in this series

  1. ESP8266 LED Lighting: Revisit and history of QuinLED (This post)
  2. ESP8266 LED Lighting: Board files and components list
  3. ESP8266 LED Lighting: QuinLED soldering tutorial & Tools
  4. ESP8266 LED Lighting: Setting voltage and flashing NodeMCU
  5. ESP8266 LED Lighting: Programming and controlling QuinLED
  6. ESP8266 LED Lighting: QuinLED v2.6 PCB
  7. ESP8266 LED Lighting: Installing COB LED downlights controlled using QuinLED
  8. ESP8266 LED Lighting: Using QuinLED with Domoticz

Be sure to also checkout

  1. ESP8266 LED lighting: LED Power Supply China vs Mean Well

Old series about my ESP8266 dimmer

  1. ESP8266 WiFi LED dimmer Part 1 of X: The setup
  2. ESP8266 WiFi LED dimmer Part 2 of X: The Hardware
  3. ESP8266 WiFi LED dimmer Part 3 of X: Flashing and programming the ESP-01
  4. ESP8266 WiFi LED dimmer Part 4 of X: Configuring Domoticz
  5. ESP8266 WiFi LED dimmer Part 5 of X: Ikea Lamp hacks
  6. ESP8266 WiFi LED dimmer Part 6 of X: ESP8266 Domoticz Wall Switch
  7. ESP8266 WiFi LED dimmer Part 7 of X: Updated Dimmer and Domoticz code
  8. ESP8266 WiFi LED dimmer Part 8 of X: Version 2 of the PCB design
  9. ESP8266 WiFi LED dimmer Part 9 of X: The new house lighting plan
  10. ESP8266 WiFi LED dimmer Part 10 of X: Finding the right lights

Video

The video basically says it all. Go and watch it!


 

 

 

What is it, how does it work?

As I said in the video, in one sentence, it’s a ESP8266 based PWM WiFi controllable dimmer. That’s a whole lot of acronyms in one sentence, so I’ll try and explain each of them desperately.

ESP8266

The ESP8266 is a micro-controller like you might know an Arduino or a Pix. These are small computers which are programmable to carry out certain tasks. They are most often tasked to handle controlling simple functions inside of a device.

In our case, the ESP8266 creates the WiFi connection and runs the program that, depending on the input value it receives, dimms the connected LED lights to the desired intensity level.

We use the two GPIO pins that the ESP8266 has to pulse the MOSFETs.

PWM

As I explained in the video, PWM is a method of digitally controlling a signal. In my case I use it’s properties to dimm the connected LED lights.

My program in the ESP8266 pulses it’s GPIO’s a 1000 times per second. The width of the pulse determines the resulting light intensity. That all sounds a bit technical, but maybe this diagram can explain it a bit better:
pwm

Pulse width modulation

Although the GPIO pins on the ESP8266 generate the pulsed signal, the MOSFETs amplify this at the original voltage and handle all the current.

MOSFETs

A MOSFET is basically a gate that can be switched on and off very quickly. The ESP8266 can only handle very low amperages at 3.3v, enough to light of a single low-power LED a bit, but certainly not more then that.MOSFETA typical TO220 package mosfet

The MOSFETs I use have three pins. Input, Output and a gate. Basically, my PCB connects the incoming 12v, 24v or 36v (or anything in between really, my design needs 5v at the lowest) to the input pin and connect the output pin to the LED lights.

The gate is connected to one of the GPIO ports on the ESP8266 and that’s, in simple terms, how the whole design works!

What do I plan to do with it?

The whole inspiration behind this project is because I believed commercial LED dimmers are too expensive and don’t offer the features I desired.

Since this is a custom solution which is software controlled, we can make the connected lights do anything we desire!

Because of that, in later code, I added an auto-calculating dimming algorithm which you can tell how long it should take to fade from [current value] to [target value]. This makes for automatic and slow of fast smooth transitions, depending on what you need!

If you are interested in where these lights are going to go in the house, take a look over here.

And if you are interested to see which lights I selected, read the article over here!

And everyone who is interested to see how far the house has progressed up until this point, check out this post and this post.

Next article

The next article will be about the hardware you need, the QuinLED board and how to solder it all together!

If you have any questions or comments, please leave them below or under the YouTube video!

Revision Photos

Prototype board

P1030727 P1030728

Version 1 PCB

P1030729 P1030730

Version 2 PCB

P1030732 P1030734

Version 3 PCB

P1030735 P1030737

Version 2.5 rev 1.00

P1030738 P1030740

Version 2.5 Rev 1.12

P1030741 P1030742

Version 2.6 rev 1.00

Check the articles in the top of the post, version 2.6 is now available and I recommend anyone getting started getting that version!

Old Article

As I mentioned, this is more of a revisit of the project I started about 2 years ago. If you would still like to read the original article, you can find it here.

Workshop 2016 download

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17 thoughts on “ESP8266 LED Lighting: Revisit and history of QuinLED”

  1. Hi !
    Thank you very much for what you are doing.
    I’m very interested in your QuinLED Projet since the beginning. I have tried to do it myself but it seems to me that the 3.3v from the ESP8266 is not enough to power the gate of the MOSFET. So at the end the led strip is blinking.. If you have any idea, please tell me.
    Thanks a lot,
    Perhan.

    1. Sadly, I think you received bad MOSFETs. I’ve had this problem with ordering them in China too.

      The MOSFETs you get aren’t the “L” version which means they require up to 5v to fully trigger the gate, where with the correct kind it only needs 3.3v. This also causes the flicking you’ve observed because the ESP8266 just can’t supply enough juice to correctly trigger the gate.

      I’m really sorry if you bought it through one of my links. 🙁

      I have corrected all the links to a supplier which at least lists very clearly that the gate will trigger at 2.5v! (http://s.click.aliexpress.com/e/7QRNfamQF)

      1. Alright that makes sense to me now 😉
        Thank you very much (even if I ordered by one of you former link) :p
        So I bought new ones from your new link and I keep you in touch.
        Just keep on doing videos and posts, I really enjoy.
        Many thanks.

        1. Awesome, please let me know if the one’s you get from the new link work correctly for you. Selecting the right seller, the right product and consistently receiving that same product can sometimes be a challenge. 😉

          1. Awesome, thnx for letting us know. This seller certainly isn’t very cheap (I can get them cheaper locally) but at least they are of the correct type!

  2. I have built a few of the version 2 boards, I love how they work, thank you! One issue I have is that it appears that the transistors switch on the ground line. This means that in a projects where I have COB lights mounted to a metal frame that the frame has to be at a positive voltage… 🙁 Shouldn’t the ground be common and the power line be switched? Maybe I’m missing something…

    1. Another symptom of this common positive power is the MOSFETs can’t touch. I realize this problem is mitigated in the recent design by putting the on opposite ends of the board. It seems like correct design should be a common ground where they can both be bolted to the same heatsink. I may be wrong and would love to get feedback on this.

    2. I incorrectly assumed the mounting plate of the COB lights I’m using was connected to negative. It would be nice to only have to run one wire to each light and have a proper ground, but all is good. 🙂 Thanks again for such an awesome project!

      1. No problem!

        About your earlier comment, from what I understood while designing the board and the project is that the MOSFET should indeed switch the ground (or minus) side.

        I’m not sure if it makes a difference for single color LED strips but with RGB strips for instance the strip has a single + line running through the strip and 3 RGB lines. If you would would PWM the + you would never be able to regulate the color.

        That way it made sense to me and that’s why I’ve always been dimming the ground (minus) side which has worked fine for me. 🙂

        Good to hear that with your COB lights the base plate isn’t connected to the ground chassis in this case. 😉

        1. Because of the way MOSFETs work, the gate has to have a voltage higher than the source. The ones we use require a Vgs (as it’s called) of >2.5V difference.

          If we were to switch the 12V line instead of GND, we would need to provide more than 14.5V on the gate. That’s why we switch GND instead, since that triggers nicely on ~3.3V 🙂

  3. Hi,

    The whole series is very professional and it’s enjoyable for beginners (like I am) too.

    I decided to build this project. When will be the last article coming?

    “I believe this might be related to my earlier designs not having resistors on the boards so maybe leakage current is killing the ESP’s?” – youtube

    Should I wait for a revisited version?

  4. Hi.
    I was watching your website and was wondering where you make your pcb. Im trying to make my own project with same idea as you but then with RF.

    Im working at the moment with europrint stuff but i want my own prints.

    So where do you make the pcbs.

    1. I get my PCB’s at dirtypcbs.com but if you read my text or watched my videos, wasn’t that obvious?

    1. Right you are, don’t know what happened there. I’ll try and get something up as soon as I can so boards can be ordered again!

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