How to build a tachistoscope is described on this website.
The tachistoscope is a necessary instrument for Individual Psychological Diagnosis(IPD).
In fact two tachistoscopes are needed to do the proper research.
With a tachistoscope an image can be projected in a very fast way (1 to 100 milliseconds, or even longer)
With two tachistoscopes two images can be projected in a very fast way, the one after the other as a very short film consisting of two frames.
Both tachistoscopes are controlled by a microprocessor (in our case an Arduino Uno).
On this webpage http://ipd-community.nl/Content1.html on the left side the whole story can be found. In the future this content will be available on this website too.