FEDEVEL
Platform forum

Pearl , 06-12-2024, 07:09 AM

Hi, I went through the whole tutorial, received the boards and uploaded the software exactly as Robert showed in the video.
the code lines where I tried to communicate with the accelerometer fails- the red LED turn on. I debugged and saw that the I2C_read1byteregister function doesn't get the correct ID value (according to datasheet 0x35) or doesn't get to the correct address (0x0e- device on bus, 0x0f- WHO_AM_I register).
Does anyone have an idea what could be te problem and how to solve it?

Robert Feranec , 06-12-2024, 08:06 AM

You mean this tutorial? https://www.youtube.com/playlist?list=PLXvLToQzgzdea0sQXmpY8k4tfiXpkYIwO

Robert Feranec , 06-12-2024, 08:06 AM

This is the latest code: https://github.com/FEDEVEL/wand

Robert Feranec , 06-12-2024, 08:07 AM

If the code doesn't work, then it may be soldering problem as it should work

Pearl , 06-14-2024, 05:58 AM

Yes, this is the tutorial. I'll try the code from the link. thanks 🙂

Pearl , 06-16-2024, 03:42 PM

So I tried this, the problem seems to be connecting with accelerometer- the red light is turned on, which means the PIC does not receive the correct ID number from the accelerometer or that the software doesn't read the correct register. I debugged the LEDs separately and they work perfectly. Any ideas how to debug this?

QDrives , 06-16-2024, 04:10 PM

Check with an oscilloscope if the I2C signals are presented on the lined.

Robert Feranec , 06-17-2024, 05:20 AM

Did you try multiple boards and they all have the same behaviour?

Pearl , 06-17-2024, 06:33 AM

Yes. I manufactured 5, the assembly looks good and they all work OK electrically. I use Pickit 5 , MPLAB 6.15 with compiler XC8. I tried the code that tests the I2C the red LED gets turned on each time.

Robert Feranec , 06-17-2024, 07:44 AM

did you use the same accelerometer? dont forget, sometimes in datasheet they use 7bit address which has to be shifted 1 bit left