ultrasonic sensor

[SC97]

Hello,

I am using HC-SR04 ultrasonic sensor and nrf52840dk. To measure the distance I have to find out for how long the ECHO pin of the sensor remains high.

for that I am doing-

/*wait till echo pin is high*/

while(nrf_gpio_pin_read(Echo) == 1);

{
  // reset counter
  count = 0;
  }

 while(nrf_gpio_pin_read(Echo) == 0);

{

further calculations...

but I am not able to get out of second while loop am I doing something wrong here.

[Kenneth]

Maybe check that pin is configured as input before reading. Also check that you have not inverted the input somehow.

Kenneth