ping_median seems to freeze a lot about arduino-new-ping HOT 6 CLOSED

I've not experienced this issue nor has it been reported previously.  I would 
try to change the PING_MEDIAN_DELAY value in the NewPing.h file.  This sets the 
time delay between pings.  The delay(50) that you're using is between groups of 
pings, not between the 5 pings sent during a ping_median().  Changing this to 
50000 microseconds is a good starting point to diagnose a problem.  My guess is 
that the particular sensor you are using needs slightly more time between pings 
to reset.  It's still odd that it would freeze, as even if I set that value to 
1000 it won't freeze for me.

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Please report this in a more appropriate place.

I am currently experiencing the same issue.

I am working on a obstacle sensing bot using 2 motors on a Tamiya double 
gearbox tracked chassis being driven by a second power source (6 AAA) 
batteries) and a L293D H Bridge as a controller.  The 5v source on my Arduino 
Uno V3 is powering the H Bridge, a mini servo (with a 100uF capacitor), and a 
HC-SR04 ultrasonic sensor.  I am using pin 8 for both the TRIGGER and ECHO.

I have only experienced system freezes when the bot is in 'Drive' mode.
During this time the code :
1) sets the speed on the 2 (Left & Right) Enable pins on the H Bridge.
2) calls myServo.ping_median(5).
3) evaluates the resulting range.
4) stops the bot if a collision is about to occur.

This loop runs about once every 50ms

It gets through between 3 and 20 loops before a call to myServo.ping_median() 
hangs the system (i have tried args of 3 and 5).  sometimes, but not always, 
the hang is so severe that the Uno drops the serial connection to the monitor.  
The motors, however, always keep running.

I have yet to experience this failure if I replace the call to ping_median() 
with ping().  Although this is undesirable since the resulting ranges are 
fairly inaccurate and frequently cause the bot to 'see' obstacles which do not 
exist.

#5 craig.n... Describes my dilema exactly.  All problems disappear when using 
just ping, but with ping_median, the processor hangs in mid air and has to be 
reset.  I've tried increasing ms to 50 from 29 in newping.h to no avail.  ????