update hcsr04.cpp by changing 20000 to 2000

Dependencies:   Stepper mbed SDFileSystem Ultrasonic PinDetect millis

Committer:
rschimpf78
Date:
Fri Jan 18 00:22:13 2019 +0000
Revision:
8:3f4d78017fd9
Parent:
1:4bda04eecf66
1.17;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
root@developer-sjc-cyan-compiler.local.mbed.org 1:4bda04eecf66 1 88834eed3de071a683ae4c96f1f398e835e213e9 stuff