LED circuit help for an SPST momentary

Alexander Rhodes · Jul 14, 2011

Hey guys, I have a SPST momentary switch with an LED built in.

I need to know if it is possible to be able to turn the LED on with the first push, and turn it off with the next, without making it a latching switch.

I have seen multiple diagrams, but they have all been built around latching switches (switches that stay on until pressed again). I can't use such a switch as rFactor and LFS both will not recognize the button press until it returns to off.

The reason behind this, is that I want to use the LED as a speed limiter indicator. 1 push of the momentary button should activate both the limiter in-game, and the LED, the next push should release the limiter and deactivate the LED.

The switch has 6 pins:

1 + 3 +
5 + 6 LED +/-
2 + 4 -

Jim Cole · Jul 14, 2011

You may have to add some sort of circuit to toggle power when you use the switch. By this I mean that you press and release the switch, the light goes on, press and release again and the light goes off. Will look into it a little and see what is required to make such a circuit.

Brian Clancy · Jul 14, 2011

I could be wrong, but this will not be that easy to achieve in a simple manner at least. Jim is right, it will require a dedicated circuit to make it work.... I will have a think

Jim Cole · Jul 15, 2011

The circuit that is required to make this work is called a "T Flip Flop" I am no electronics person so I can't tell you how to make it, but that is what you need for the light to function the way you want it.