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 microcontroller (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.
A two channel tachistoscope
Two UNIC LCD-LED-Beamers where adapted so that they can be used as a tachistoscope.
The led light power was interrupted and connected to a CRYDOM SSR relay D2D12.
The SSR relay was connected to an Arduino Uno to steer the switching of the Led light of the beamer.
The Arduino was connected to a laptop by means of an Usb hub.
The AVG input of the beamer was connected to the hub by means of a AVG-USB video graphic card.
Computer programs were written in Microsoft Visual Basic.
The firmware for the Arduino Uno was programmed in C.
UNIC LCD-LED-Beamer from the back:
we see an AVG Input,
a connector with switch, this is added to the original beamer
and to the right the power cable.
The connector with switch is a 3d printed addition to the beamer:
when the switch is "on", the beamer can be used as a beamer,
when the switch is "off", the beamer can be used as a tachistoscope.
A wire of the led-light is interrupted and connected to the connector and switch.
+ to the left and - to the right input.
The + and - are connected to a Crydom SSR D2D12.
The Crydom SSR is connected to an Arduino UNO. And the Arduino Uno is connected to a PC/Laptop.