Sparkfun Illuminated Switch Schematic
I got these really nice illuminated switches from Sparkfun to control the Rubens’ Tube I built with a friend. Wiring them up was strangely non-obvious so I figured I’d post a schematic here.
The coldest winter I ever spent
I got these really nice illuminated switches from Sparkfun to control the Rubens’ Tube I built with a friend. Wiring them up was strangely non-obvious so I figured I’d post a schematic here.
Wasn’t half of the problem that the switches are poorly labeled when we got them? Do you remember how they were labeled? That might help as well for reusing them in the future.
Michael, my diagram is a pretty good representation of the actual switch. So a person should be able to hold up the switch, compare it to my image and go from there.
I just looked this up yesterday. It’s a real pain to reverse engineer wiring of things that are voltage sensitive without this schematic. The built in switch led drops the voltage enough to really effect things. It’s a little frustrating based on how nice these switches are to use.
Heh, years later and they haven’t posted a schematic. I posted a “review” with the schematic on the Sparkfun site. Time flies, eh?
Too be fair, A LOT happened in the interim. My brain always wants to run positive on the device line for some reason.
I just bought one of these for a project. Your schematic is very helpful, thanks. Do you know if this switch has an internal resistor? The similar switch on the Adafruit site indicates there is an internal resistor in their switch. Any reason to think they’re not all the same? Sparkfun is still silent on any useful information about this switch. I’ll be using with batteries for a 3V power supply.
It’s been a while since I worked on this but, no I don’t think there’s an internal resistor. If you want to power the internal LED, you need an external resistor like I show in the schematic. Though, if you’re running just 3 volts through it, maybe you don’t need a resistor at all to make the LED light up. I see a note on the Sparkfun site that says “Note: The LED can be illuminated with as low as 3.3V.” Go for it!
Get out your trusty multimeter and find out if there’s a resistor in it! And please post back here for the next intrepid electronics explorer to discover!
So, this is terrible of me, but I’ve run these switches on 12vdc all day long without ever looking for a resistor. They’ve lasted for hundreds of hours without a problem, which makes me think they’ve gotta have something. In my experience, vanilla LEDs have a tendency to aggressively release the magic smoke when exposed to voltages like that sans resistor.
SO it’s almost 5 years since the last comment here, and they’re still selling these switches, and luckily the link here is still in the comments.
My car (95 Honda accord) got stolen and they broke the ignition cylinder. Rather than buying a new one with new set of keys, I removed the old one and bought these switches to wire up the ignition system.
With my bit of testing I can confirm the LED lights up with 12v power when the switch is turned on, no outside resister. Now as to how long it will continue to function that way… no comment. Yet.
Wolfe, thanks for the mention. Yeah, it’s funny how physical electrical equipment changes very little over the years while software is screeeeeaaammming ahead!