[Microbit-Python] Help - ultrasound hcsr04 sensor

[T Gamble]

@Jim Mussared



Yes Jim, I'm happy to use whatever means to get the HCSR04 sensor working. I will download uFlash now and see if that makes any difference.



In the code I submitted, what edits do I need to make?



thanks



tim

________________________________

From: Microbit [microbit-bounces+tgamble941=c2kni.net at python.org] on behalf of David Whale [david at thinkingbinaries.com]
Sent: 21 July 2017 10:29
To: For Pythonic MicroBit related discussions
Subject: Re: [Microbit-Python] Help - ultrasound hcsr04 sensor

There is an issue where if you turn the bitbot on or reset it while it is on a surface, both the line sensors are wired to the buttons.

The workflow is that if you hold both buttons while powering up or reset, this initiates bluetooth pairing mode.

4tronix Gareth is aware of this.

Best thing is hold it in the air when you power it on.


___________________________________________________________
David Whale, B.Sc (Hons), MIET
Software Engineer and IET Schools Liaison Officer, Essex


On 21 July 2017 at 05:15, Jim Mussared via Microbit <microbit at python.org<mailto:microbit at python.org>> wrote:
The bit:bot is totally amazing - we just got one for the office here. :D

I actually got the ultrasonic sensor working earlier this week (using
a similar approach to the temp/humidity sensor in the previous thread,
and also similar to the code you linked to), but it required changes
to the micropython firmware. I'm happy to share a hex file that works
if you're happy to use uFlash (or manually patch the uflash.py in Mu).

FYI, If you're using the latest firmware in Mu / uFlash, you might
also notice crashes when controlling the robot and using the radio at
the same time. This is actually fixed, but there hasn't been a
firmware release since then. However I noticed that the latest
firmware breaks support for NeoPixels -- I have a fix for this too but
I don't understand why it broke. It's on my list for this weekend to
investigate and raise some bugs / send some PRs to the micro:bit
micropython repo.

On 21 July 2017 at 13:17, Nicholas H.Tollervey <ntoll at ntoll.org<mailto:ntoll at ntoll.org>> wrote:
> I believe this is a known problem and will be fixed in the next release
> (in the not-too-distant-future).
>
> N.
>
> On 21/07/17 00:00, T Gamble wrote:
>> Hi,
>>
>> The MicroPython solution posted here on
>> GitHub https://github.com/fizban99/microbit_hcsr04 will not enable me to
>> use the Mirco:Bit and Bit:Bot (seeBit:Bot
>> <http://4tronix.co.uk/blog/?p=1490>) and HC-SR04 ultra sound sensor. The
>> bit:bot provides pin15 for accessory connections, whereas the posted
>> solution uses multiple pins. (I am restricted to pin15 on my bit:bot)
>>
>> I've tried this on Microsoft MakeCode (block editor) and it works ok -
>> setting ping trig and echo both to pin 15, from sonar block package/module.
>>
>> I've been troubleshooting thus for hours on end & all I get on the
>> MicroBit's LED matrix is the value '  -11 ' or 'Pairing Mode' weirdly!
>>
>> Please help. Thanks.
>>
>> Tim
>>
>>
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