This Wiki page provides a detailed guide on how to setup and operate PixArt's ADBM-A350 sensor with the Nordic nRF52-DK microcontroller.

Hardware¶

• 1.) PC with Windows Operating System
• 2.) Nordic nRF52 Microcontroller
• 3.) ADBM-A350 Evaluation Board
• 4.) USB Cable (USB-A Male to Micro-USB Male)
• 5.) Jumper Cables
  
  • NOTE: PC not included in image.

Importing Code¶

First, we need to import code into the microcontroller to start talking to the sensor. For the firmware code, please visit this product's components page here:
[TO BE ADDED SOON]

• 1.) Login/create an mBed account.
  
  
• 2.) Import the reference firmware into mBed's online compiler using the "Import program" button. You can find this in the link above.
  
  
• 3.) When importing the program, make sure you import it as a program and not a library.
  
  
• 4.) Make sure the selected platform is the Nordic nRF52-DK.
  
  
• 5.) Make sure your Nordic nRF52 microcontroller is plugged into your PC. It should show up as a separate drive similar to the (C:) drive. Then, you can compile the program and save the HEX file into your microcontroller.
  
  
  • NOTE: If you suspect your code did not import properly, please try unplugging the device, plugging it back in, and then re-compiling and saving the code into the device.

Connection¶

Please refer to the images and notes below for details on how to connect your hardware.

SPI

• VDD on the ADBM-A350 evaluation board connects to any 1.8V source.
• MISO, MOSI, CS, and SCLK connect to the SPI pins as shown above.
• NRST on the ADBM-A350 evaluation board connects to any 1.8V source.
• GND on the ADBM-A350 evaluation board connects to any GND pin on the Nordic nRF52 microcontroller.
• SHTDOWN on the ADBM-A350 evaluation board connects to pin 20 (p20) on the Nordic nRF52 microcontroller.
• IO_SEL on the ADBM-A350 evaluation board connects to pin 19 (p19) on the Nordic nRF52 microcontroller.
• NC = No connection.
  
  

I2C

• VDD on the ADBM-A350 evaluation board connects to any 1.8V source.
• NRST on the ADBM-A350 evaluation board connects to any 1.8V source.
• MISO on the ADBM-A350 evaluation board acts as the SDA pin and connects to pin 26 (p26) on the Nordic nRF52 microcontroller.
• GND on the ADBM-A350 evaluation board connects to any GND pin on the Nordic nRF52 microcontroller.
• CS on the ADBM-A350 evaluation board connects to pin 22 (p22) on the Nordic nRF52 microcontroller.
• MOSI on the ADBM-A350 evaluation board connects to pin 23 (p23) on the Nordic nRF52 microcontroller.
  • For I2C, CS and MOSI are used to determine the slave address (Default p22 and p23 HIGH with I2C address 0x57).
• SHTDOWN on the ADBM-A350 evaluation board connects to pin 20 (p20) on the Nordic nRF52 microcontroller.
• IO_SEL on the ADBM-A350 evaluation board connects to pin 19 (p19) on the Nordic nRF52 microcontroller.
• NC = No connection.
  • NOTE: You may need a 1.8V source because the nRF52 microcontroller does not have an analog output in this voltage range.

Functional Test¶

• 1.) You will need a terminal emulator program. The one used in this guide will be Tera Term. If you do not already have it, you can find it at this link:
  https://en.osdn.jp/projects/ttssh2/releases/

• 2.) Open Tera Term and go to File > New Connection or use the hotkey "Alt + N". Select "Serial" and choose the COM port corresponding to your microcontroller. Then click on "OK".
  
  
• 3.) Go to Setup > Serial Port and set the baud rate to 115200. Then click on "OK".
  
  
  
• 4.) Go to Setup > Terminal and change "Receive" from "CR" to "LF". Then click on "OK".
  
  
  
• 5.) With the hardware wired up properly, the firmware loaded into the microcontroller, and the terminal emulator set up, we should now be able to see the sensor working. If you slide your finger across the sensor, you should see outputs on the terminal:
  • "deltaX" and "deltaY" show the number of counts detected per report.
  • "X-axis Counts" and "Y-axis Counts" show the total number of counts recorded throughout runtime.

Thank you for choosing PixArt! If you have any questions, feel free to contact us at: sales_us@pixart.com.