momentary switch help

Thread Starter

nycjay01

Joined Jul 22, 2015
2
Hi Everyone,

I've got a simple project that I am working on just for fun. I am a track coach and I am looking for a way to wire a LED light to a momentary switch? I am looking for my athletes to push down on a button connected to a LED light. When the button is released I want the light to turn on. Can someone direct my to any sites that might have these types of switches. I am looking to maybe screw the "touch pad to a small piece of plywood then run wires to a battery powered LED light on a stand.
 

MaxHeadRoom

Joined Jul 18, 2013
30,655
If you need a mom P.B. switch that operates only on release you may need more than just a common switch, a relay or other circuit means of latching.
You most likely will need a reset also?
Max.
 

ian field

Joined Oct 27, 2012
6,536
If you need a mom P.B. switch that operates only on release you may need more than just a common switch, a relay or other circuit means of latching.
You most likely will need a reset also?
Max.
Sometimes one of the push buttons on the front panel of a PC is a non-latching changeover - sometimes even 2 pole.

It can be a push to make or a push to break, depending how you wire it.
 

MaxHeadRoom

Joined Jul 18, 2013
30,655
He mentions the LED being turned on on release, latched or not is not mentioned, if momentary, how long???
I don't see 'On until he sets off'?
Max.
 

Thread Starter

nycjay01

Joined Jul 22, 2015
2
He mentions the LED being turned on on release, latched or not is not mentioned, if momentary, how long???
I don't see 'On until he sets off'?
Max.
Hi max I am looking for the light to be turned on until the button is released.

I'll look at the buttons suggested here my only concern would be that Led light are slow to turn on and I was hoping the button/light combo would be as fast as a regular light. I'm looking to put a light on a tripod so I can start my timer from a distance by waiting for the light
 

ScottWang

Joined Aug 23, 2012
7,501
I'll look at the buttons suggested here my only concern would be that Led light are slow to turn on and I was hoping the button/light combo would be as fast as a regular light
If the Led light are slow to turn on, that is the fade in function, you can choose a switch combined with the led, but they must be turn on very quickly, and the fade in function needs a circuit to complete it.
 

ian field

Joined Oct 27, 2012
6,536
If the Led light are slow to turn on, that is the fade in function, you can choose a switch combined with the led, but they must be turn on very quickly, and the fade in function needs a circuit to complete it.
LEDs light instantly - EPE magazine published a project for faster on car brake lights - first part of that was LEDs light quicker than the thermal inertia of a bulb filament. The other part of the trick was detecting when the foot was lifted off the accelerator - that was the biggest part of eliminating the delay, but the quickness of LEDs was still a significant part of it.

Some types of opto-coupler can work as fast as hundreds of kilocycles, slow by pulse transmission standards - but much faster than the eye can see.
 

ScottWang

Joined Aug 23, 2012
7,501
LEDs light instantly - EPE magazine published a project for faster on car brake lights - first part of that was LEDs light quicker than the thermal inertia of a bulb filament. The other part of the trick was detecting when the foot was lifted off the accelerator - that was the biggest part of eliminating the delay, but the quickness of LEDs was still a significant part of it.

Some types of opto-coupler can work as fast as hundreds of kilocycles, slow by pulse transmission standards - but much faster than the eye can see.
What you said does any connection to what the TS needs?
 
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