diff --git a/nano_c_mk1/nano_c_mk1.ino b/nano_c_mk1/nano_c_mk1.ino
index 19a254c..b68a966 100644
--- a/nano_c_mk1/nano_c_mk1.ino
+++ b/nano_c_mk1/nano_c_mk1.ino
@@ -8,6 +8,7 @@
 unsigned long currTime;  // non-blocking timer
 Adafruit_ADS1115 adc;
 int i;  // loop iterators
+float adcReadings[ADS_MAX];
 
 void setup() {
   Wire.begin();