URM37 V4.0 Ultrasonic Sensor for Rasberry Pi

To whom it may concern:

I'm trying to get URM37 V4.0 Ultrasonic Sensor to work for Rasberry Pi. Any pointers?

According to your website:

https://www.dfrobot.com/wiki/index.php/ ... U:SEN0001)

In PWM trigger mode demo code, you only have to give a low-to-high pulse on Pin 6 COMP/TRIG (URM V4.0) of the sensor and should read out PWM ranging information on Pin 4 ECHO (URM V4.0) or DAC ranging information on Pin 7 DAC (URM V4.0). I configured Rasberry Pi accordingly and output a low-to-high pulse on Pin 6 but gotten nothing back on neither Pins 4 or 7. Am I doing anything wrong?

Measure mode: PWM trigger by default (out-of-box) correct?

Any pointers would be great.

Thanks,

Speed