dSPIC33CK Curiosity IMU Data Logger

Repository Overview

This repository contains firmware for streaming up to 3-axes IMU data over UART from the dSPIC33C Curiosity board with Base board and Mikroe IMU2 or IMU14 Click boards, streaming using MPLAB Data Visualizer stream.

Compatible MikroE Click Boards

Hardware Used

• DSPIC33CK CURIOSITY DEVELOPMENT BOARD (DM330030)

• IMU 2 click board

• IMU 14 click board

Software Used

• MPLAB® X IDE
• MPLAB® XC16 compiler
• MPLAB® Code Configurator
• MPLAB® Data Visualizer

Related Documentation

• dSPIC33CK Product Family Page

How to Configure, Compile, and Flash

The steps below explain the process of configuring the the data logger firmware build, compiling it, and flashing it to the dSPIC33CK device.

1. Plug the dSPIC33CK Curiosity Board into your PC via USB.
2. Install the MPLAB X IDE and XC16 compiler. These are required to load the data logger project and to program the dSPIC33CK Curiosity Board.
3. Open the dspic33ck-curiosity-imu-data-logger.X project folder in MPLAB X.
4. Select the appropriate MPLAB X Project Configuration for your sensor according to the table below.

   Sensor Type	MPLAB X Project Configuration Selection
   Bosch BMI160 IMU	SNSR_TYPE_BMI160
   TDK ICM42688 IMU	SNSR_TYPE_ICM42688

Project configuration can be set in the MPLAB X toolbar drop down menu as shown in the image below

MPLAB X Project Configuration Selection

5. Modify high level sensor parameters like sample rate (SNSR_SAMPLE_RATE), by changing the macro values defined in app_config.h. See the inline comments for further description.

6. Once you're satistfied with your configuration, click the Make and Program Device button in the toolbar (see image below for reference).

   Make and Program Device

Firmware Operation

The data streamer firmware will output sensor data over the UART port with the following UART settings:

• Baudrate 38400
• Data bits 8
• Stop bits 1
• Parity None

In addition, the onboard LED3 will indicate firmware status as summarized in the table below:

State	LED Behavior	Description
Streaming	LED3 (GREEN) blink	Data is streaming.
Error	LED3 (RED)	Fatal error. (Do you have the correct sensor plugged in?).
Buffer Overflow	LED3 (YELLOW) on for 5 seconds	Processing is not able to keep up with real-time; data buffer has been reset.

Usage with the MPLAB Data Visualizer and Machine Learning Plugins

This project can be used to generate firmware for streaming data to the MPLAB Data Visualizer plugin. Once the firmware is flashed, follow the steps below to set up Data Visualizer.

1. Connect the Curiosity board to your computer, open up MPLAB X, and open the Data Visualizer plugin.
2. Click the Load Workspace button as highlighted in the image below. Select one of the workspace files included in this repository - located under the dv-workspace folder - whose name most closely describes your sensor configuration; you can always modify the configuration once it is loaded if needed.

Loading the workspace file

3. Next, select the Serial/CDC Connection that corresponds to the Curiosity board, adjust the baud rate to 38400.

Configuring the dSPIC33CK serial port

4. Use the play button on the Serial/CDC Connection to connect to the serial port. Once the connection is made, the dSPIC33CK will be available for use with the variable streamer.

Start Streaming

5. Switch to the Variable Streamers tab and select the aforementioned Serial/CDC Connection from the drop down menu as the input data source for the IMU variable streamer (see image below for reference); this will enable parsing of the dSPIC33CK data stream. You may delete or add variables here if your sensor configuration differs from the pre-loaded ones.

Variable streamer data source selection

The IMU data should now be available in the time plot.

Data Visualizer Time Plot

Visit the Machine Learning Plugin page to learn more about using the Data Visualizer plugin to export your data for machine learning applications.