A button is a button, and an LED is a LED, but this LED illuminated button is a lovely combination of both! It's a medium sized button, large enough to press easily but not too big that it gets in the way of your project panel. It has a built in LED that can be controlled separately from the switch action - either to indicate or just to look good.
The body is a black plastic with the LED built inside. There are two contacts for the button and two contacts for the LED, one marked + and one -. The forward voltage of the LED is about 2.2V so connect a 220 to 1000 ohm resistor in series just as you would with any other LED to your 3V or higher power supply.
This particular button has a red body and LED and is momentary, normally open. The two switch contacts are not connected normally. When you push the button they will temporarily connect until the button is released. The LED is separated from the button, so you can make it light up when pressed, light up when not pressed, always lit, etc.
Momentary LED red button
Max Dimensions: 18.06mm / 0.7" x 18mm / 0.7" x 29.4mm / 1.15"
Shaft Dimensions: 14.89mm / 0.58" x 15.56mm / 0.6" x 18.7mm / 0.73"
Could you please tell me what current the inbuilt LED would draw. Is it possible to light it from a Pis GPIO via a safety resistor?
The forward voltage of the LED is about 2.2v
According to old information (relating to the original RPi) the maximum current draw per GPIO pin is 16mA with a total draw of 51mA. Srouce: https://www.element14.com/community/thread/20982/l/raspberry-pi-gpio-pin-max-current?displayFullThread=true
Therefor, if you want to only draw, lets say 10mA to be safe, then using a 11 ohm resistor will do the job. Using a higher resistor will reduce the current draw, but also the brightness of the LED.
Ohms Law: R = (V1 - V2) / I
V1 = source voltage (in the case of the pi gpio, thats 3.3v) V2 = voltage drop (in the case of the led its 2.2v)
I'd recommend using a 220 ohm resistor to start with and see if you are happy with the brightness.
Was this answer helpful?0
PREV 1 of 1 NEXT
Reviews about 16mm Illuminated Push Button - Momentary - Red
Total reviews: 0 Write your own review on this product.