diff --git a/modules/saadc/saadc.ino b/modules/saadc/saadc.ino
index a173b87845d0cc04a6b181760e03958dc5f91451..fa964c498710f23e8b47dd603a4a760821098172 100644
--- a/modules/saadc/saadc.ino
+++ b/modules/saadc/saadc.ino
@@ -1,6 +1,6 @@
 //sec, 2017
-
 #define N_SAMPLES 48
+static int16_t data_buffer[N_SAMPLES] = {0};
 
 void adc_setup() {
   //configure SAADC resolution