Hi,

so, here's the deal: I'm assembling a Raspberry based magicmirror. The control board I'm using to manage the LCD has a satellite board with 5 temporary switches to regulate audio volume, screen menu and a master. I need to relocate the switches since the shape of the board is unpractical.

Since I have to do that, I would like to use some TTP223s I spared from the system 220V master switch I made with another TTP223 and a relay.

The control board runs on 12V but the tension on the satellite switches is 3.3. My doubt is: how do I operate the TTP223 on the board? Can I do it directly and how to wire everything?



(nevermind the cables, I was testing some physical switches)

It's probably trivial but, with no specific competence, I'm a little stuck on it.

 

control board runs on 12V but the tension on the satellite switches is 3.3

Hello there. Please forgive me but I must ask.What sort of tension or force is being is applied to the satellite switches.& Is that supposed to be 3.3 Newtons or Volts.

 

Well, since the Newton is a unit of force while I wrote "tension", I guess we can assume I meant 3.3V

Now, do you also have a possible solution on the topic?

 

One way is to use the TIP223 output drive an opto isolator then it can switch the 12V without problems.

 

One way is to use the TIP223 output drive an opto isolator then it can switch the 12V without problems.

I did not think about that. So I can basically still power the TTPs with the same power source I'm using for the master switch and use a 5 or 5+ channels isolator to communicate with the satellite board, just like I would use a relay set. I guess it is also more reliable than using relays.

Thanks for your feedback