search

dhhagan / py-opc

Python wrapper for the Alphasense OPC-N2 built around py-spidev
MIT License
30 stars 26 forks source link

Using the library for accessing a device connected via USB #15

Closed rouvoy closed 8 years ago

rouvoy commented 8 years ago

My OPC-N2 device is connected to my Raspberry Pi 2 using a USB adapter, and the current version of the library fails to connect to the device. Did you give a try to such settings?

dhhagan commented 8 years ago

That is correct. I assume you are using a SPI-USB adapter? The library is written to communicate directly over the Raspberry Pi's SPI interface only. You will need to connect the Pi to the OPC-N2 as shown in the documents, or write SPI-USB drivers for the original Alphasense code. Let me know if you have any more questions.

nmarcelo commented 7 years ago

How can I write SPI-USB drivers for the original Alphasense code?

DancingQuanta commented 7 years ago

What SPI-USB devices are you trying to use with alphasense?

On 24 Sep 2016 08:53, "MarceloYung" notifications@github.com wrote:

How can I write SPI-USB drivers for the original Alphasense code?

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/dhhagan/py-opc/issues/15#issuecomment-249351545, or mute the thread https://github.com/notifications/unsubscribe-auth/AIB3VX_Bk8MNCB-WpFkcxNBb1YDSW5ZTks5qtNb1gaJpZM4HVm6b .

dhhagan commented 7 years ago

@MarceloYung And what do you mean by the 'original Alphasense code"? The only software they offer is a windows-based GUI; is this what you're referring to?

nmarcelo commented 7 years ago

I am using the py-opc library for an OPC-N2 sensor, and it doesn't work. And I am connecting the raspberry PI 2 and the OPC-N2 with a SPI-USB adapter. The connection doesn't start using the library. I tried the sensor in Windows application (provided by Alphasense) and it worked correctly. I was reading this page and you said that the OPC-N2 and that the library is written to communicate directly over the Raspberry Pi's SPI interface only, and I am asking how to comunnicate when I use an USB adapter, as I show in the attached image file. The version of my OPC-N2 is v18.2. Thanks for your help!! 20160924_073603

DancingQuanta commented 7 years ago

Ah, I wrote such a driver for that adapter, that adapter is called USB-ISS. My driver is a python module at https://github.com/DancingQuanta/pyusbiss. You have to download it and install using the instructions on my README. Please open an issue over there if you have any issues. I also have an example script that I will upload soon.

On 24 Sep 2016 13:51, "MarceloYung" notifications@github.com wrote:

I am using the py-opc library for an OPC-N2 sensor, and it doesn't work. And I am connecting the raspberry PI 2 and the OPC-N2 with a SPI-USB adapter. The connection doesn't start using the library. I tried the sensor in Windows application (provided by Alphasense) and it worked correctly. I was reading this page and you said that the OPC-N2 and that the library is written to communicate directly over the Raspberry Pi's SPI interface only, and I am asking how to comunnicate when I use an USB adapter, as I show in the attached image file. The version of my OPC-N2 is v18.2. Thanks for your help!! [image: 20160924_073603] https://cloud.githubusercontent.com/assets/22395840/18808488/c2daacae-8229-11e6-8b5d-c0001788d1e8.jpg

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/dhhagan/py-opc/issues/15#issuecomment-249363327, or mute the thread https://github.com/notifications/unsubscribe-auth/AIB3VToG8Fb02P73kGTAP9PjDbiUGEZbks5qtRzugaJpZM4HVm6b .

DancingQuanta commented 7 years ago

@MarceloYung I have uploaded the example script here https://github.com/DancingQuanta/pyusbopc. Please open an issue over there if you have any problems

nmarcelo commented 7 years ago

Thanks very much, my project is working!!

DancingQuanta commented 7 years ago

Fantastic

On 24 Sep 2016 17:49, "MarceloYung" notifications@github.com wrote:

Thanks very much, my project is working!!

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/dhhagan/py-opc/issues/15#issuecomment-249374863, or mute the thread https://github.com/notifications/unsubscribe-auth/AIB3VbesWaAWh2dg_n31MCWj_2cqaGfAks5qtVSsgaJpZM4HVm6b .