3 Programs with an SPDT ON-OFF-ON Switch

Hardware questions and issues with the FV-1

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smear
Posts: 14
Joined: Fri Jul 01, 2016 9:47 am

3 Programs with an SPDT ON-OFF-ON Switch

Post by smear » Wed Mar 08, 2017 12:24 pm

Hello,

In my FV-1 designs so far, I've used an SPDT ON-ON switch to select between two presets. However, a lot of pedal manufacturers seem to get three presets using a SPDT ON-OFF-ON switch, and I simply can't seem to figure out how they're doing it. Do I not actually need to ground the pins for them to be in the 0 position?

Here's the setup that I'm currently using:

Image

Thanks!

Aaron
Posts: 46
Joined: Wed Mar 04, 2015 7:10 pm
Location: Oklahoma

Post by Aaron » Wed Mar 08, 2017 12:57 pm

If you connect 3.3V to pin2 on the switch, have pull down resistors on S0 and S1 and connect both of these to pins 1 and 3 on your switch.


Image

smear
Posts: 14
Joined: Fri Jul 01, 2016 9:47 am

Post by smear » Wed Mar 08, 2017 1:28 pm

Thanks for the fast reply Aaorn, that makes perfect sense!

So to put my mind at ease, this would do the trick?

Image

Aaron
Posts: 46
Joined: Wed Mar 04, 2015 7:10 pm
Location: Oklahoma

Post by Aaron » Wed Mar 08, 2017 2:44 pm

That looks like it will do the trick. This should give you access to programs 0-2.

smear
Posts: 14
Joined: Fri Jul 01, 2016 9:47 am

Post by smear » Wed Mar 08, 2017 9:55 pm

Great, thank you so much!

BuGG
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Joined: Thu Sep 10, 2015 4:25 am

Post by BuGG » Thu Jun 29, 2017 3:50 pm

This is exactly how I do it. The cool thing is that you can use a SPDT On-On switch when you only need two modes, or On-Off-On when you need three. No further circuit modifications needed.

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