diff --git a/main.c b/main.c
index 2b877bf..8da9f8d 100644
--- a/main.c
+++ b/main.c
@@ -117,8 +117,7 @@ int main(void) {
 
         GrContextForegroundSet(&sContext, ClrPink);
         for(j=0; j<LOCAL_BUF_LEN; j++) {
-            #define TRANSPOSE(x) (HEIGHT/2) - (x >> 8)
-            //GrPixelDraw(&sContext, j, TRANSPOSE(local_adc_buffer[j]));
+            #define TRANSPOSE(x) (HEIGHT/2) - (x >> 6) // reduce from twelve to six bits, then flip and center
             uint32_t upper,lower, current, last;
 
             if (j==0) {
@@ -141,6 +140,7 @@ int main(void) {
             GrLineDrawV(&sContext, j, lower, upper);
         }
 
+#ifdef DISPLAY_TIME
         // display time
         time = gTime; // read shared global only once
 
@@ -168,6 +168,7 @@ int main(void) {
             offset += 10;
             buttons >>= 1;
         }
+#endif // DISPLAY_TIME
 
         GrFlush(&sContext); // flush the frame buffer to the LCD
     }