Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: William Ray Wing <wrw@mac.com>
Newsgroups: comp.lang.python
Subject: Re: GoPiGo distence sensor
Date: Wed, 15 Jun 2016 11:47:20 -0400
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> On Jun 15, 2016, at 10:59 AM, Joel Goldstick =
<joel.goldstick@gmail.com> wrote:
>=20
> On Wed, Jun 15, 2016 at 10:15 AM,  <ldompeling@casema.nl> wrote:
>> I have a small robot on wheels named the GoPiGo.
>> What I want is if the distence sensor read the same distence for let =
say 5 seconds then the GoPiGo go's backward.
>>=20

When I look at the API, I see two functions related to distance =
traveled.  An encoder target function that presumably reads the numbers =
from an angular encoder on the drive shaft and allows you to specify a =
number for the encoder to seek, and a =E2=80=9Cus_dist=E2=80=9D function =
that seems to read the proximity to an object from an ultrasonic sensor. =
 I=E2=80=99m going to assume you are referring to the numbers from this =
ultrasonic distance sensor.  So, I think what you are saying is that if =
the numbers from the distance sensor are unchanged for 5 seconds (as =
would be the case if the GoPiGo were being blocked by something) then =
you want it to back up.=20

As MRAB has commented, what you need to do is set up a delay loop that =
wakes up every second (or more frequently if you want more time =
resolution) and reads the number returned by the us_dist function.  =
Compare it to the previous reading and if unchanged increment a counter. =
 If it has changed, the robot has moved so clear the counter.  If the =
counter reaches your five second trigger point, call a go_back function =
you write.

-Bill


>> But I don't now how to program this in python.
>> The Api functions for the GoPiGo are here: =
http://www.dexterindustries.com/GoPiGo/programming/python-programming-for-=
the-raspberry-pi-gopigo/
>>=20
>> Can someone help me with this.
>>=20
>> --
>> https://mail.python.org/mailman/listinfo/python-list
>=20
> You can start here: https://www.python.org/about/gettingstarted/
>=20
>=20
> --=20
> Joel Goldstick
> http://joelgoldstick.com/blog
> http://cc-baseballstats.info/stats/birthdays
> --=20
> https://mail.python.org/mailman/listinfo/python-list