diff --git a/main.c b/main.c
index 8c956ce..339db86 100644
--- a/main.c
+++ b/main.c
@@ -16,6 +16,7 @@
 #include "Crystalfontz128x128_ST7735.h"
 #include <stdio.h>
 #include "buttons.h"
+#include "sampling.h"
 #include <math.h>
 #include "inc/hw_memmap.h"
 #include "driverlib/gpio.h"
@@ -109,4 +110,4 @@ int main(void) {
 
         GrFlush(&sContext); // flush the frame buffer to the LCD
     }
-}
\ No newline at end of file
+}
diff --git a/sampling.c b/sampling.c
index f661b22..2070218 100644
--- a/sampling.c
+++ b/sampling.c
@@ -11,9 +11,8 @@
 #include "inc/hw_memmap.h"
 #include <math.h>
 #include "buttons.h"
+#include "sampling.h"
 
-
-#define ADC_BUFFER_SIZE 2048 // size must be a power of 2
 // index wrapping macro
 #define ADC_BUFFER_WRAP(i) ((i) & (ADC_BUFFER_SIZE - 1))
 // latest sample index
diff --git a/sampling.h b/sampling.h
new file mode 100644
index 0000000..69ea810
--- /dev/null
+++ b/sampling.h
@@ -0,0 +1,11 @@
+#ifndef SAMPLING_H_
+#define SAMPLING_H_
+
+#include <stdint.h>
+
+#define ADC_BUFFER_SIZE 2048 // size must be a power of 2
+
+// initialize ADC and ISR
+void start_sampler(void);
+
+#endif /* SAMPLING_H_ */