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  • Author Author: dougw
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PiCassoTizer - The Wand - Blog 7

dougw

I decided the PiCassoTizer needs a wand to act like a touch screen paint brush with mouse functionality.

I was going to give it a fancy name, but all the cool names I thought of sounded too pretentious.

The features it needs are:

  • and ergonomic grip
  • a reflective pointer
  • 2 microswitches to emulate mouse buttons
  • a debounce circuit to permit accurate button activity

The following video shows the wand construction, the circuit and its performance:

 

Here is a picture of the switches wired on a strip board with 2 SPDT microswitches:

image

 

This is the debounce circuit implemented on the circuit board:

image

Here is what the 3D printed wand looks like:

image

Here is what the circuit board and switches look like when inserted in the wand:

image

Here is what the cable looks like in its channel:

image

Here is a picture showing typical switch bounce (in green) and the cleaned up output (in yellow):

image

This part of the project is relatively simple, but it takes a surprising amount of time to design, build, troubleshoot and blog about something even this simple.

 

Next I will try to get the DACs working....

Then build frames for the cameras and computers...

Then put it all together and adjust the geometry and the software ...

Then attempt some art...

 

Relevant links:

PiCasso Design Challenge

 

PiCassoTizer - Introduction - blog 1

PiCassoTizer - Electronic Parts - Blog 2

PiCassoTizer - Finger Detection Image Processing - Blog 3

PiCassoTizer - Absolute Mouse Position - HID Simulation - Blog 4

PiCassoTizer - The Snowman Smiles - Blog 5

PiCassoTizer - Pi Expanse - blog 6

PiCassoTizer - The Wand - Blog 7

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