Make: Volume 90

switch, the LCD counter increments.

Figure

H

shows the completed electronics

with battery pack, speaker, sound board, counter

module, and wired switches.

3. FABRICATE THE NEEDLE HANDLE /

SWITCH

For the needle handle, I turned a cylinder out of

Delrin plastic to slide smoothly inside a piece of

PVC pipe. I drilled a through-hole in the center to

accept the felting needle, then I cut a clearance

slot in the end to hold the needle’s bent end

(Figure

I

).

The mini pushbutton switches are foam-taped

together back to back (Figure

J

) and positioned

inside the pipe, between the end cap and the

needle cylinder. Now when the needle is pressed

down it slides ...