Library for HC-SR04 and SRF04 ultrasonic sensors

[SkG]

Hi all!

Now I've received my ultrasonic sensors (the previous one died, so I orderer two new) I tested my lib for it

So here it is if anyone is interested on it: https://github.com/skgsergio/Micropytho ... rasonic.py

At the moment it only allows one sensor but I plan to make an object that could be initialized with the two pins for each sensor (till 15th July I'm kinda busy).

[mithru]

Hi Sergio,

I've updated your code to allow more than one sensor. I've made a pull request to your github project page.
I've tested this with two HR-SR04 sensors (added that as example code in the pull request). Do have a look and let me know if something's not working.

My fork of your project is available here: https://github.com/mithru/MicropythonLibs

If you think the update is fine, please do accept the pull request.

EDIT: For the benefit of anyone else reading this looking for the updated library, Sergio has merged the update. The library now features the following:

- multiple sensors accepted
- returns values in cm / inches

Final working library available here (with an example):
https://github.com/skgsergio/MicropythonLibs

[gcarver]

I got my HC-SR04 working thank you very much. However I did have to make a change. I found that if there was nothing withing about 15 inches of the sensor I would end up in an endless loop waiting for the echo value to go to 0. I added a loop limit of 1000 iterations and that fixed the deadlock.

Also of note. I was using x1 and x2 for echo/trig but that would cause pyb.delay() to lockup. I switched to x7 and x8 and that fixed the problem.