Re: Need help with PI PICO...

The Natural Philosopher <tnp@invalid.invalid> wrote:

It would seem from the pin states that it gets permanently stuck in    
 
while(!gpio_get(ULTRASONIC_IN))
                ;
 
Which as understand it is waiting for the module (HCSR04) to *start* to
send a pulse.

Can you scope it to see if the module is actually sending a pulse?

Is the pulse perhaps too short for the Pico to detect?  eg if the loop or
gpio_get() function took some time, it could be the signal goes 0-1-0 in the
middle of a loop iteration and so the gpio_get() never sees it go 1.

Theo