 unsigned long MinTickTime_ms;
 // ((WHEEL_DIAMETER_MM * 3142) / MAX_SPEED_mmPs)
 // MinTickTime_ms = 89 ms
-#define MIN_SPEED_mPh 500
+#define MIN_SPEED_mPh 3000
 // A speed of less than 0.5 KPH is zero.
 unsigned long MaxTickTime_ms;
 // ((WHEEL_DIAMETER_MM * 3142) / MIN_SPEED_mmPs)

#define SerialOdoOut  Serial3
#define SerialMonitor Serial

#define WHEEL_DIAMETER_MM 397
#define MEG 1000000
#define MAX_SPEED_KPH 50
#define MAX_SPEED_mmPs   ((MAX_SPEED_KPH * MEG) / 3600)

    pinMode(13, OUTPUT); //led
    digitalWrite(13, LOW);//turn LED off
    
    pinMode(3, INPUT);//pulls input HIGH
    float MinTick = WHEEL_DIAMETER_MM * PI;
//    SerialMonitor.print (" MinTick = ");
//    SerialMonitor.println (MinTick);
