triggerino

Arduino based mock trigger device to use for developing fMRI stimulation code (in case you need to sync your stimulation with the MRI triggers).

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Basic use: while the button is pressed, it will flash the led and send a letter (e.g., a 't') every x msec (e.g., 1800 msec) to the connected computer.

Code

In triggerino.ino set the trigger key and the TR according to your need (see example below)

// set trigger key
char triggerKey = 't';

// set TR in msec
int TR = 1800;

Circuit

Elements you need:

• Arduino Leonardo (compared to the classic Arduino UNO, computers and Matlab see it as an external keyboard)

• micro USB cable

• breadboard

• 6 jumpers

• 1 basic led

• 1 basic button

• 2 resistors (220 Ω and 10 kΩ)

How to use it

sandbox_getTrigger.m is a PsychtoolbBox based script that waits for the Arduino input (a keyboard stroke) to do something.