Switch Common Pos Instead of Neg - Preferred Positive...?

ProffieOS
1

The ability to have switch common as a positive instead of a negative can sometimes be incredibly useful, and I have done it a few times, But if memory serves, I’ve always wired to 3.3 volt.

I’m just wondering if it’s acceptable to use Batt + instead, as I have an install in which that would help me from a wire management perspective.

The reason I ask is when I’ve checked voltage on a normal switch-to-ground install, the button voltage has always been rock solid at 3.29 volts (unless there’s been a wiring problem somewhere). So I’m just wondering if that stability is important for the switch not to get confused, as Batt+ will obviously vary quite a lot from 4.2 volts to 2.9 volts depending on battery charge level.

My hunch is that either 3.3 volt or batt+ would work - I’m just wondering if one is preferred over the other as best practice, or does it genuinely make no difference?

Thanks in advance.
:slight_smile:

2

Batt+ should work just fine. The button pads are 5v-tolerant, and can handle the extra voltage.

1 Like
3

It really makes no difference.

1 Like
4

Thanks as always Prof! :pray: :+1: :slight_smile:

5

Ha. Reduces the wires from a switch back to the board to one. Nice.

6

Yeh there are lots of times when it’s handy. You can run one side of the switch to the neo connector Batt+, or use a six ring pogo connector to drive two switches and a neo connector with blade detect, or save full length wire runs up and down the hilt, or, as in the hilt I’m working on, have a 3-pin and a 2-pin jst connector to allow quick removal of a switchbox with neopixels and two switches. (A 2-pin and 4-pin would be too bulky, and two 3-pins opens the risk of the user reconnecting them the wrong way round).

Plenty of ways to skin the same cat with ProffieOS! :smiley: