[sdiy] Jack insertion detection

Daniel Roberts danmroberts at gmail.com
Mon Jul 23 23:36:23 CEST 2018

Mutable Instruments Rings module sends a stream of known random values to
the switching jack, which are then read back in by the MCU to see if the
switch is still connected to the tip:


On Mon, Jul 23, 2018 at 5:21 PM, Tim Ressel <timr at circuitabbey.com> wrote:

> Hello supremely helpful folks!
> I've got another challenge: how to detect when a plug is inserted into a
> jack. These are 3.5mm mono jacks btw. The current method is to use a stereo
> jack. When a mono plug is inserted the ring connection gets shorted to
> ground by the sleeve of the plug. This method works well, but the stereo
> jacks are taller than the mono jacks.
> The only jack I can use is a switched mono jack where switched port is
> tied to the tip port until a plug is inserted. My idea is to use the switch
> port to feed an out of range voltage to the tip port, probably a negative
> voltage. Then use a comparator to detect when the tip port goes high.
> Any other thoughts?
> --
> --Tim Ressel
> Circuit Abbey
> timr at circuitabbey.com
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