WMYCONGCONG 10 PCS Light Emitting Diodes Momentary Tactile Tact Push Button Switch 12 mm x 12 mm x 7 mm Red White Yellow Blue Green

These are awesome. I use these without needing a resistor at all.Yes the maximum LED can handle contiously is 3V, but if you use Arduino or ESP, simply use 'analogWrite(pin, value);' instead of digitalWrite High, to ensure an under 3V average to LEDs, with value of that PWM to be between 50 to 200 (depending on how bright you'd want).For the button I use the internal pull-up resistor of ESP8266, works the same as any other push button.A small mark on one LED pin means it's negative.LED can be controlled indepent from the button if needed. Which is great as I use the LED as a feedback from the other device to know it's actually on.

If you are going to use these on breadboard / push in prototyping boards, the led pins are very thin, very easy to bend, and may not make a good connection.But when soldered into your pcb / verro board this issue will go away.

I got these to make an ESP32 based button control. 3d printed a box to take eight of the buttons. The LEDs are just LEDs so you need a current limiting resistor in series to suit the working voltage. I further restrict the LED brightness using pwm from the ESP32. In the image the two green buttons are dimly illuminated to act as markers to easily find the controls in the dark.Really nice buttons that work well and look good, perfect tactile feel make these easy to push with enough feedback.

Overall, I like these, they seem well built and so far, I haven't found a single dud (unlike some of the other reviews). My only beef thus far is the fragility of the LED pins on the buttons, they are so small (in diameter) that even Du-Pont leads fall straight off.I don't know of any connector small enough that will make a good connection with these pins? I bought these to use in a project that will not be using a breadboard so if someone out there has a good solution for attaching cable to the LED pins, I'd be pleased to hear it.Had this not been such an issue, I would have given 4, possibly five stars.

Very handy positive feedback "click" momentary PCB mount switches with built in LED.

Theses are great for electronic projects. Work great as a power and reset buttons for my raspberry pi 400. As there is not pinout diagram provided or description of the pins. This is how mine are set up:The LED is controlled from the thin (careful with these they are fragile can easy snap) legs with one on each side of the switch. I found the one the red dot on it was the negative connection (-ve) . Others might have this as the positive so best test first. You'll need to connect a resistor between your negative power supply and the negative connection on the led or you may fry the led. To know what value resistor use this calc: (your input power voltage minus the max voltage of the LED) then divide that value by the max current for the LED. Then you'll have your residence value.The switch is controlled from one side or the other pairs of legs/connectors, so you could connect up two different circuits to be controlled by the switch. Eg on my pi I can have two scripts running and listening on two different pins and execute two separate/ in isolation actions. Cool.

Ideal for DIY FS2020 panels. LED needs a resistor in series to limit current. Bought 2 packs, 1 for future use.

Really nice little units with a great action and bright LED back light

Finally go to use and Only 4leds worked and then those burned out, lowered voltage to 5v and still popped 2nd and 3rd hworking led 4th lasted at 3v don't buy for led you will be dissatisfied.

If you don't put in a resistor, these fry almost instantly even at 3v. You cannot attach these to an Arduino or ESP8266 without a resistor. it will flash and fry in a fraction of a second.And that's fine. That's OK. We can add a resistor.But this thing should come with a slip of paper, as it costs us a couple of these before we figure that out. You can generally get away with lighting LEDs for a short burst to see if they need a resistor (too bright? needs a resistor) but you cannot do that with these.These just need a slip of paper or something on the label.

Great buttons, work as expected, Good feel, not bad of a bounce in my case. I recommend a 4.7K Ohm current limiting resistor for the led on 5V to give a good brightness that does not hurt to look at. These buttons do not work in a solder-less breadboard as the pins for the anode and cathode will ride down the center space without anything to connect them to. I fired up KiCad and designed a small board to solder the buttons to that will allow for use of the light and the button.

The LEDs will burn out at anything over 3v.

I used it on a PCB (non-standard pins so you have to design it). I should have checked each LED before soldering. One didn't work at all and one had reversed label for cathode (anode was marked with the red dot.)As long as you do your own QA it's not too bad for the money. But be prepared to have 10% failure.