This is a perfect choice if you are in need of a heavy duty push button! These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated red LED ring. It is a SPDT with 16mm threading and 1mm pitch. This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection. These momentary buttons are rated up to 3A and 250VAC while the LED is rated for 5-12V.
Note: The images for this button show an LED voltage rating of 5V. We have verified that the voltage range for the the LED to be 5-12V. We are currently communicating with our supplier for new documentation. Trust the branding on the button to verify your voltage requirement.
The pushbuttons (like the momentary https://www.sparkfun.com/products/11966 or latching https://www.sparkfun.com/products/11971 ) have an indication of the pinout of the buttons on the side of the plastic molding. One way to test the switch is to use a multimeter turned to the continuity setting. Here are what the pins (not in any particular order associated with the pushbutton's spades):
+ = LED Anode - = LED Cathode C = "Common Ground" NC = Normally Closed NO = Normally Open
One way to light the LED on the metal push button would require you to wire it so that when you press down on the button, the led would light up. You would need 5V to light the LED ring. It can be lit up with a smaller voltage but the LED won't light up as bright.
To connect the battery to the button so that it only lights when the switch is pressed down (momentary or latched), you would connect 5V to the "+" pin on the switch. This is assuming that your system is using the same voltage source that is 5V. Then from the "+" pin, you would wire it to the normally open (NO) pin.
Another wire would be connected from the "-" pin to the C pin. The C pin would essentially be connected to your ground. So as you press down on the button, it would flip the switch and complete the circuit from the normally closed (NC) pin to normally open (NO) pin while lighting the LED ring at the same time. It might be a good idea to use a current limiting resistor (like standard 330Ohm resistor) if you are using 5V directly from your power supply. The LED won't be as bright but you also wouldn't be reducing the life of the LED. I am not sure of the electrical characteristics of the LED that is in the pushbutton.
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If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Based on 6 ratings:
1 of 1 found this helpful:
Worked as it should. Check your depth, this thing is longer than I expected. I almost didn't have enough room for it.
Low profile, bright and easy to see and no need for external resistors for the LED
Very nice button. Well built and heavy construction. I am using 5 of them in a target control build (3 red and 2 green). At this time I am confident they will perform well in the field. Thanks SparkFun a perfect match for my project.
Good button, but for $6.00 I'd expect that the data sheet included a pin out.
Sorry about that. We didn't bother putting the pinout on the data sheet since it's already printed on the switch itself. If you look in the "Product Help and Resources" section above and click on "Tech tips" we have a description of what the pins do.
The action is comfortable, it clicks around 1.5mm and bottoms out at 3mm. The opening is just big enough for an intentionally-placed finger. The red ring is evenly lit and comfortably bright at 5V.
I've not tested these yet, but they seem well-built.
1) For those who wonder about the pinout as I did before receiving one, look at a bottom view photo or 3D rendering and orient it such that the pins resemble a smile rather than a frown. Starting from the left and going CCW:
2) I would not be comfortable connecting these to more than about 9 VDC without adding a series resistor. My testing shows that the red LED pulls 36 mA and the green LED pulls 33 mA at 12 VDC, both of which are higher than small LEDs normally prefer. FWIW, I also determined that the internal red LED has a Vfwd of 1.8 V and the green Vfwd = 2.4 V, approximately, and it seems that each has a 290 ohm series resistor within the pushbutton housing. I plan to connect these LEDs to a 24 VDC circuit with the addition of an external 1 kilohm series resistor to limit the current to about 16 mA.