diff --git a/Latex/main.pdf b/Latex/main.pdf
index c1c49e3..b9d7fa5 100644
Binary files a/Latex/main.pdf and b/Latex/main.pdf differ
diff --git a/Latex/main.tex b/Latex/main.tex
index 9801f99..34128d9 100644
--- a/Latex/main.tex
+++ b/Latex/main.tex
@@ -558,7 +558,7 @@ int trig;
 int echo;
 //ISR for PCINT2
 ISR(PCINT2_vect) {
-  if((PIND & (1<<echo)) > 0) {
+  if((PIND & 64) > 0) {
     pulseStart = micros();
   } else {
     startNewMeasurement = true;