     pinMode(SHUT_LED, OUTPUT);
     pinMode(EXPOSE_OUT, OUTPUT);
     pinMode(EXPOSE_LED, OUTPUT);
+    pinMode(STIM_IN, INPUT);
+    pinMode(STIM_LED, OUTPUT);
     // Initial pin states
     turn_ant(false);
     turn_shutter(false);

// Control a run
void run(int predelay, int antdelay, int shutterdelay, int exposuredur, int postexposure)
{
    delay(predelay);      // just to let things settle
    //turn_ant(true);       // whap the ant
    //delay(antdelay);      // wait for motor movement
    turn_shutter(true);   // tell the shutter to open
    delay(shutterdelay);  // let the shutter physically respond
    turn_exposure(true);  // tell the camera to take a pic

int SHUT_LED   = LED4;
int EXPOSE_OUT = SIG5; // to exposure trigger
int EXPOSE_LED = LED5;
int STIM_IN    = SIG3; // to stimulus trigger
int STIM_LED   = LED3;

// Begin setup of board
void setup()
