MSP-EXP430FR5739 Accelerometer demo with PC GUI

[nemetila 12]

Hi!

 

 

I am developing a simple accelerometer with the MSP-EXP430FR5739. This board is populated with a 3-axis accelerometer: ADXL330. No additional HW is needed.

 

The MCU program does:

• ADC:
  • Samples data from CH_0 to CH_14 in Repeat-Sequence-of-Channels Mode
  • Sample Rate: ~ 20 Hz/Channel
  • DMA
• UART:
  • HW UART (TX only) with 9600 baud. This 9600 baud is limited by the emulator circuit.
  • UART TX data1 = ADC_CH_12 = ACC_X;   sample "622-X"
  • UART TX data2 = ADC_CH_13 = ACC_Y;   sample "509-Y"
  • UART TX data3 = ADC_CH_14 = ACC_Z;   sample "511-Z"
• LEDs: LED_TX and LED_ADC

 

The PC application does:

• Calculate the 3 acceleration components (g_x, g_y, g_z) from the ADC data and the CALIBRATION data
• Calculate the magnitude of G; |G| = sqrt(g_x^2 + g_y^2 + g_z^2);
• Displays data

CALIBRATION data must be enter by the user once at the beginning. The user has to rotate slowly the board in every 3 direction (and opposite) to find the maximum (+1g) and the minimum (-1g) ADC values of the 3 axis. Enter this 3*2=6 ADC data to the 6 white textboxes. If the CALIBRATION data are correct then |G| must be 1.00 (static acceleration of gravity).

.

 

The TX data can be viewed with putty too:

 

 

Requirements:

• MSP-EXP430FR5739 board
• Code Composer Studio 5.4 to compile the MCU source file:ACC Demo v03_main.c
• Windows OS with .Net framework 4 to run the PC app: ACC Demo v03_Release.zip (extract and run "ACC Demo v03.exe").

   

 

The CPU usage may be high when PC application receives data. I will try to reduce this in the next version.

[sgccarey 0]

Nice work, this has been a real help to me. Thanks!

[irharrier2 0]

Wow. I have been searching for weeks on how to calibrate the accelerometer sensor. Now that I have found you application I am not able to run it.

I really appreciate it if you could give me the source code or recompile the file for me.

 

Many thanks.

[nemetila 12]

It should run, I have just tested it a minute ago. I can share the source but I have very limited C# skills, so the code is ugly.

 

Windows app project files: ACC Demo.zip

CCS project files: CCS.ZIP