Wiring a 19mm 2P 3P rotary switch for the jog multiplier function on the new Acorn USB BOB

[Chas]

Hi guys, thank you for all the input. i'm going to have to think about the next step given the input from people who know more than me. I'm still a little perplexed however as one would assume that as there is a control panel on the Centroid web page where they advertise the USB BOB using this type of switch that it must be possible for it to work otherwise it wouldn't be there. As the switch is in the right most position in the photo im guessing it must be a latching switch as the momentary version returns to the central position. It does say in the BOB manual that it's a momentary switch which latches in the BOB until a different jog button is pressed. May end up redoing the fascia panel and putting in 3 small momentary push buttons so i don't run into any of the issues Roger has come across in testing. Appreciate all the help.
Cheers
Charlie

[cnckeith]

i moved this post into the Acorn forum

[ShawnM]

Rotary switches are latching and they come in two flavors, "break before make" and "make before break" and as noted you need the "break before make" for this input. Look for a SP3T rotary switch online. Check Digikey and Mouser as they carry both. Anything that springs back to center is not really a rotary switch but more like a momentary pushbutton and wont work for this input.

[RogDC]

Charlie,
If you have a latching switch you can run the constant low input to Arduino inputs and write simple code to momentarily provide a low output on one of 3 pins correlating to the switch position. Depending on what model/brand you could do this for less than $20 or on up to how fancy you want to get.

If you have the space you could get by with an Arduino Uno. I may have code that would work or modified easily from one of my earlier code sketches.

For my code to toggle low on the Jog x1, x10, x100 I toggle the Arduino output pins LOW for 300ms. Seems to work fine for changing jog speed.

It could save you from having to rework the panel.

I made a quick sketch in Wokwi to give you an example of how to do this . Just press the play button and select switches 1-3 on the DIP Switch - they didn't have a rotary switch to use in the circuit. https://wokwi.com/projects/412124988358476801

[Chas]

Thanks Roger, very much appreciated. Could save a lot of reworking.
Cheers Charlie

[RogDC]

One other note if you decide to go with the Arduino, you will need to provide power and GND to the board from the BOB or other source. If you use 5VDC from the BOB, connect it to the Vin pin of the arduino and GND to GND.