Short background without going into too much detail.
I have a homelink garage door module that I am going to extend the original buttons on and mount the buttons remotely. I have the buttons figured out, but there is a small status led mounted on the circuit board that helps with programming and also flashes when a button is pressed.
My new buttons have LEDs built in and I would like to have them work as the status led. I tried to hook another normal led in parallel with the existing one to test since my switches haven't arrived yet. I was able to get a yell or green led to light, but red ones wouldn't work. I'm guessing they take more current or something.
It has 3 buttons that I will be extending, so I thought it would be nice to have each button's led light only when it is being pressed rather than all of them lighting together. I think I can use 4 optocouplers to accomplish this. One would be triggered by the board led circuit and it would power the emitters of the other 3. The collectors would then be connected to the LEDs in the buttons.
The + side of the LEDs is internally switched inside the switch, so I was going to use the collectors to provide the ground for each led individually.
I found a video that pretty much shows what I am thinking.
He uses a quad optocoupler that he supplies the part number for, but mouser says it is obsolete.
I have some dual relay module boards from eBay that have single optocouplers built in. I could scavenge them, but I'm not sure if they are rated for 12vdc.
They say dp817c. Also, which resistors would I need to use? I assume the led on the homelink board probably already has a resistor in the circuit as well as the buttons since they are designed for 12v, so I think I would only need them on the emitters of the 3 optocouplers.
Otherwise, if someone knows of a replacement for the quad optocoupler in the video, it would probably be simpler to just order that.
Let me know if that isn't enough information. And thanks in advance for the help.
I have a homelink garage door module that I am going to extend the original buttons on and mount the buttons remotely. I have the buttons figured out, but there is a small status led mounted on the circuit board that helps with programming and also flashes when a button is pressed.
My new buttons have LEDs built in and I would like to have them work as the status led. I tried to hook another normal led in parallel with the existing one to test since my switches haven't arrived yet. I was able to get a yell or green led to light, but red ones wouldn't work. I'm guessing they take more current or something.
It has 3 buttons that I will be extending, so I thought it would be nice to have each button's led light only when it is being pressed rather than all of them lighting together. I think I can use 4 optocouplers to accomplish this. One would be triggered by the board led circuit and it would power the emitters of the other 3. The collectors would then be connected to the LEDs in the buttons.
The + side of the LEDs is internally switched inside the switch, so I was going to use the collectors to provide the ground for each led individually.
I found a video that pretty much shows what I am thinking.
I have some dual relay module boards from eBay that have single optocouplers built in. I could scavenge them, but I'm not sure if they are rated for 12vdc.
They say dp817c. Also, which resistors would I need to use? I assume the led on the homelink board probably already has a resistor in the circuit as well as the buttons since they are designed for 12v, so I think I would only need them on the emitters of the 3 optocouplers.
Otherwise, if someone knows of a replacement for the quad optocoupler in the video, it would probably be simpler to just order that.
Let me know if that isn't enough information. And thanks in advance for the help.