Hi
it is claimed that the max range of measuring of ultrasonic module JSN-SR04T is 5m.
I have applied the 10 us high level signal to Trig pin but always the max high time of echo is less than 10ms. so the max range which I can detect with this device is near to 1.6m. by the way the high time of echo is measured by digital Oscilloscope.
has anyone gotten the better prformance from this device?
is there any point which i forget.
Yes, I have used that sensor. It measures upto 200 cm (2 meters). I have successfully used it to measure more than 2 meters. I also use US020 similar sensor which can measure upto 7 meters. I was successful in using both precisely.
For both, I would expect 5 m range only under optimal conditions, e.g. large and acoustically hard target perpendicular to the sensor axis. It's using a typical car obstacle detection transducer, mostly operating in a range up to 1 or 2 m.
I have applied the 10 us high level signal to Trig pin but always the max high time of echo is less than 10ms. so the max range which I can detect with this device is near to 1.6m. by the way the high time of echo is measured by digital Oscilloscope.
By the way, how do you measure the echo ..
is it the time between Trigger and front edge .. or back edge Echo signal...
on HC SR04 echo time is on back edge .. so include all duration of the echo at logical status ONE.
in the module's user guide it says that the time duration of high level echo is the duration of time of flight.
when the 10us pulse receives to trig pin the echo goes high and when the reflected wave receives to echo pin it goes down.
so i have calculted the time between generating 10us and falling edge of echo