Issues with capacitive touch. Need suggestions.

[Hootis Tigglebits]

So I’ve rigged this solder dispenser up. It features a lipo charger, 3.7v lipo battery, TTP223 capacitive touch board with 47pF capacitor added to dull the sensitivity, the trace to the touch sensor on the backside has been cut and I added an external trigger wire attached to the needle.  As you can see in the video below it works fine like this, but when I insert solder wire through the needle it becomes unpredictable and either won’t work when the solder wire is touched or will run continuousl which I’m guessing is due to the length of the solder wire changing the sensitivity of the touch and/or the auto calibration of the TTP223. Does anyone have any recommendations on how I can fix this or a better suited IC for this project? Thank you.
https://youtu.be/1woOxOE5BTE?si=hqmUrynakopUDeBq

[CountChocula]

Did you try pulling down LPMB and pulling up SLRFTB? That might help mitigate the problem a bit. Another alternative might be to try and isolate the wire away by using a teflon-coated needle, but ultimately with a coil of solder wire you're adding a big antenna to the circuit, so I'm not sure that you can really get away with it.

Edit: Another alternative is to not rely on contact with the soldering iron as a trigger for the feeder mechanism. The only automatic dispensers I have ever seen use a foot pedal, probably because the flow of solder would be too unpredictable otherwise. Perhaps consider using a different approach where you control the motor with your body instead (e.g.: still using a capacitive sensor, but requiring your hand or fingers to touch some surface in order to trigger the motor).