Re: Need help with PI PICO...

On 30/03/2024 02:04, Jim H wrote:

On Fri, 29 Mar 2024 10:49:13 +0000, in <uu66b9$83pi$3@dont-email.me>,
The Natural Philosopher <tnp@invalid.invalid> wrote:
 

Maybe ascii art will help
>
CONTROL=10µs
____| |________
>
RETURN = wahatever
_____|^^^^^^^^^^^^|____________
>

 Assuming my bleary-eyed math is correct, 10µs is the length of one
cycle of ultrasound at 100,000 Hz.
 

The width of that pulse is pretty much immaterial - its only a digital trigger, It doesn't send anything directly.
The unit does that, and senses a high to the output. Then it transmits a squawk., When it receives an echo it switches that to low.
Its a smart device .
https://cdn.sparkfun.com/datasheets/Sensors/Proximity/HCSR04.pdf

So what frequency is your ultrasound? Maybe some ASCII art - to scale
- of the waveform going down and back will reveal something.
 

40Khz allegedly. see datasheet

I admit total ignorance to whether your devices can send sound and
receive at the same time, etc, etc, so this is my last potentially
annoying input. Good luck.
 

Ive no idea either, Its got two things that might be transducers,

Spent many an evening with Z-80 assembler back in the late 70s. Good
times.
 

Yes. I finally connected the dots between hardware and higher level languages
Anyway the unit now appears to be stable, i've watched it fail to connect, and recover, I've watched it detect it had lost wifi and reconnect after that, and it hasn't crashed or locked up yet, so I think   that's as far as the code needs to go right now.
Next step is to concert to battery and check if the battery saver works, and see how long it lasts on batterries
--
"An intellectual is a person knowledgeable in one field who speaks out only in others...”
Tom Wolfe