diff --git a/hoverbrettctrl/src/main.cpp b/hoverbrettctrl/src/main.cpp
index 53a15e6..b9244d3 100644
--- a/hoverbrettctrl/src/main.cpp
+++ b/hoverbrettctrl/src/main.cpp
@@ -104,7 +104,8 @@ float filter_stop_set_steer=0.06; //safety stop
 
 #define GT_LENGTH_MAXLENGTH 2000 //maximum length in [mm]. maximum string length is around 2m80
 #define GT_LENGTH_ADC_MAXDIFF 127 //maximum adc value difference between A and B poti. Used to detect scratching poti. during length calibration was 57
-int raw_length_maxdiff=0;
+int raw_length_maxdiff=0; //maximum value seen since boot/reset
+int raw_length_diff=0; //maximum value since last log write
 //TODO: implement error for poti maxdiff
 uint16_t gt_length=0; //0=rolled up, 1unit = 1mm
 /* calibration 20220410
@@ -369,7 +370,8 @@ void loop() {
     int raw_length_a=analogRead(PIN_GAMETRAK_LENGTH_A);
     int raw_length_b=analogRead(PIN_GAMETRAK_LENGTH_B);
     
-    raw_length_maxdiff=max(raw_length_maxdiff,abs(raw_length_a-raw_length_b));
+    raw_length_maxdiff=max(raw_length_maxdiff,abs(raw_length_a-raw_length_b)); //overall max
+    raw_length_diff=max(raw_length_diff,abs(raw_length_a-raw_length_b)); //max since last log write
 
     int raw_length=(raw_length_a+raw_length_b)/2;
 
@@ -683,22 +685,28 @@ void loop() {
           dataFile.print("current_L,current_R,");
           dataFile.print("rpm_L,rpm_R,");
           dataFile.print("temp,vbat,");
-          dataFile.println("trip,currentConsumed,motorenabled,disarmedByDelay");
+          dataFile.println("trip,currentConsumed,motorenabled,gt_length,raw_length_diff,gt_horizontal,gt_vertical,disarmedByDelay");
           dataFile.print("#TIMESTAMP:"); dataFile.println(now());
           logging_headerWritten=true;
         }
-        dataFile.print(String(loopmillis)); dataFile.print(";");
-        dataFile.print(esc.getCmdL());  dataFile.print(";");
-        dataFile.print(esc.getCmdR());  dataFile.print(";");
-        dataFile.print(esc.getFiltered_curL(),3);  dataFile.print(";");
-        dataFile.print(esc.getFiltered_curR(),3);  dataFile.print(";");
-        dataFile.print(esc.getFeedback_speedL_meas());  dataFile.print(";");
-        dataFile.print(esc.getFeedback_speedR_meas());  dataFile.print(";");
-        dataFile.print(esc.getFeedback_boardTemp());  dataFile.print(";");
-        dataFile.print(esc.getFeedback_batVoltage());  dataFile.print(";");
-        dataFile.print(esc.getTrip());  dataFile.print(";");
-        dataFile.print(esc.getCurrentConsumed(),3); dataFile.print(";");
-        dataFile.print(motorenabled); dataFile.print(";");
+        dataFile.print(String(loopmillis)); dataFile.print(",");
+        dataFile.print(esc.getCmdL());  dataFile.print(",");
+        dataFile.print(esc.getCmdR());  dataFile.print(",");
+        dataFile.print(esc.getFiltered_curL(),3);  dataFile.print(",");
+        dataFile.print(esc.getFiltered_curR(),3);  dataFile.print(",");
+        dataFile.print(esc.getFeedback_speedL_meas());  dataFile.print(",");
+        dataFile.print(esc.getFeedback_speedR_meas());  dataFile.print(",");
+        dataFile.print(esc.getFeedback_boardTemp());  dataFile.print(",");
+        dataFile.print(esc.getFeedback_batVoltage());  dataFile.print(",");
+        dataFile.print(esc.getTrip());  dataFile.print(",");
+        dataFile.print(esc.getCurrentConsumed(),3); dataFile.print(",");
+        dataFile.print(motorenabled); dataFile.print(",");
+        dataFile.print(gt_length,0); dataFile.print(",");
+        dataFile.print(raw_length_diff,0); dataFile.print(",");
+        raw_length_diff=0; //reset
+        dataFile.print(gt_horizontal,0); dataFile.print(",");
+        dataFile.print(gt_vertical,0); dataFile.print(",");
+        
         dataFile.print(debug_count_disarmedbecauseofnrfdelay);
         dataFile.println("");
         dataFile.close();