TWI scanner and sensors

RE: TWI scanner and sensors

Erick_s — Fri, 14 Aug 2020 19:54:37 GMT

Hello guys,

I've been through the same trouble while trying to scan for the addresses of two sensors using de TWI scanner from the SDK on my nRF52 DK. What happens is that while gathering documentation for my project, I ran over two versions of the same 'wrong documentation' on the DK. I'm calling them wrong because they lead to these misconceptions if someone isn't looking into the header files.

The first one is this Portuguese publication about the DK here, this is a very famous tech site here in Brazil so I think you should reach out to them and warn about it. The second one is a publication in English, located here, which is one of the top results while searching for 'nrf52 dk pinout'.

Well, this is just a way to help someone who might have been caught by these 'wrong pinouts' and has been struggling to find a way out. Just as a reminder: It's always good to take a look at the headers of the examples, the answer to this problem is there but I think these misconceptions really get us confused.

RE: TWI scanner and sensors

Jørgen Holmefjord — Fri, 10 Mar 2017 14:22:12 GMT

Are you sure you have defined the pins correctly? The TWI scanner example define SCL line on pin 27 and SDA on pin 26 by default. Did you change the example to swap these pins?

RE: TWI scanner and sensors

Levi — Fri, 10 Mar 2017 13:05:38 GMT

My mistake! I attached my source files now, thanks!

RE: TWI scanner and sensors

Jørgen Holmefjord — Fri, 10 Mar 2017 08:10:29 GMT

The zip only contains the Keil project file. I was thinking more of your entire project directory, containing your source files etc.

RE: TWI scanner and sensors

Levi — Thu, 09 Mar 2017 16:44:53 GMT

Alright, I have edited my question with the project zip file attached.

RE: TWI scanner and sensors

Jørgen Holmefjord — Thu, 09 Mar 2017 16:38:42 GMT

You can upload a zip file here, or you can create a case on MyPage if you do not want to share it in public.

RE: TWI scanner and sensors

Levi — Thu, 09 Mar 2017 16:37:23 GMT

I am using the ADXL345 accelerometer and the Heart Rate Monitor Interface (HRMI) board from Sparkfun.

What would be the best way to share my project with you?

Thanks

RE: TWI scanner and sensors

Jørgen Holmefjord — Thu, 09 Mar 2017 16:28:54 GMT

Which sensors are you using? It sounds strange that you can only use those pins. Could you share your project?