Implementing Matter weather station using nrf52840DK and Bosch BME280 sensor

[rutwik]

Hi,

I am using nrf52840DK and trying to implement a weather station application using thingy53 application example.
I am using a Bosch BME280 sensor and could read the data from the using I2C.

Now I was integrating it into matter using same DK and BME280 sensor I have done all required changes for my application and tried to build but I got Issue with the RAM.

While build it says RAM overflow by some bytes as i have attached the image below I anyone faced this issue it will be helpful for my implementation.

I want to know do I need add some thing in config file or how can i build this in to flash.

Thanks in advance

[Marte Myrvold]

Hi,

Are you using prj.conf or prj_release.conf as the configuration file when building?
The Matter Weather station, and Matter in general, requires a lot of flash and RAM, so you might get issues running it on the nRF52840 DK unless you use the release configuration. You might also have to make additional changes to reduce the memory footprint further. I recommend going through our Memory footprint optimization guide to see how to reduce ROM and RAM.

Best regards,
Marte

[rutwik]

Hi,

I am using prj.conf while building my application.

I will go through the footprint optimization and if I couldn't solve it i will get back you.

Thanks for the quick reply.

[rutwik]

Hi Marte,

I have tried using prj_release.conf and the i could build the code and also flashed it into the DK but i could see any error msg or the board doesn't give any data out.

previously I could get the data from the sensor from the dk.

but once i have tried to implement it in matter the DK doesn't show to connet via BLE.

The only output msg i get in the serial monitor is booting zephyr version.

I don't see any LED either on the board after flashing the code.

is there anything I am missing.

Thanks.

[Marte Myrvold]

Hi,

The release config turns off logging, so it makes sense that you do not see any serial logging from the device. However, you should still be able to connect to the device over Bluetooth and the LEDs should still be working. You can try using prj.conf and instead reduce the footprint according to the Memory footprint optimization guide.

Best regards,
Marte

[rutwik]

Hi Marte,

I have tried using prj.conf and tried to optimise the footprint according to the guide you provided,.

Still I could not connect using bluetooth.

But when i tried flashing different application from matter, I could see my device as a bluetooth device I am unable to connect to it.

I see LED glowing with very low intensity but unable to connect to the device.

Is there anything that I could change to make bluetooth enable.

Thanks and Regards

Rutwik

[Marte Myrvold]

Hi Rutwik,

rutwik said:

Still I could not connect using bluetooth.

Do you see the device advertise?

Do you have application logs from the device that you can share?

Best regards,
Marte

[rutwik]

Hi marte,

I don't see the device advertising.

I have attached some of the files from build and what i see in the serial monitor.

I could see everything build and flashing in the board but I don't see the device advertising or any thing on the serial terminal.

Thanks & regards

Rutwik

[rutwik]

Hi Marte,

# Enable CHIP

CONFIG_CHIP=y

CONFIG_CHIP_ENABLE_PAIRING_AUTOSTART=y

CONFIG_CHIP_PROJECT_CONFIG="src/chip_project_config.h"

# 32781 == 0x800D (matter example of Temperature measurement device as NCS Weather Station)

CONFIG_CHIP_DEVICE_PRODUCT_ID=32781

CONFIG_STD_CPP17=y

# Enable Bluetooth Low Energy

CONFIG_BT_DEVICE_NAME="MatterWeather"

# Add support for LEDs, buttons and buzzer

CONFIG_DK_LIBRARY=y

CONFIG_PWM=y

# Configure Thingy:53 sensors

CONFIG_I2C=y

CONFIG_SENSOR=y

CONFIG_BME280=y

CONFIG_ADC=y

# Suspend devices when the CPU goes into sleep

CONFIG_PM_DEVICE=y

# Other settings

CONFIG_IEEE802154_NRF5_RX_STACK_SIZE=8192

CONFIG_THREAD_NAME=y

CONFIG_MPU_STACK_GUARD=y

CONFIG_CHIP_LIB_SHELL=y

# Average Thingy:53 current consumption

CONFIG_AVERAGE_CURRENT_CONSUMPTION=10000

# Enable DFU over Bluetooth LE SMP

CONFIG_CHIP_DFU_OVER_BT_SMP=y

# Increase system workqueue size, as SMP is processed within it

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

# 0x0302 (Temp. sensor)

CONFIG_CHIP_DEVICE_TYPE=770

CONFIG_BT_RX_STACK_SIZE=1500

# Configure UART logging and shell

CONFIG_LOG=y

CONFIG_LOG_MODE_DEFERRED=y

CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=1024

CONFIG_LOG_BUFFER_SIZE=8192

CONFIG_LOG_FUNC_NAME_PREFIX_DBG=n

CONFIG_MATTER_LOG_LEVEL_DBG=y

CONFIG_SHELL=y

CONFIG_SHELL_LOG_BACKEND=y

# Configure USB CDC ACM

CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=y

CONFIG_USB_DEVICE_PRODUCT="NRF52840DK Matter Weather"

CONFIG_USB_DEVICE_PID=0x530D

CONFIG_UART_LINE_CTRL=y

CONFIG_SHELL_BACKEND_SERIAL_INIT_PRIORITY=51

# Use minimal C library instead of the Picolib

CONFIG_MINIMAL_LIBC=y

this is the prj.conf file that I am using to build.

And I dont see any thing on the serial monitor I am attaching what I am able to see through Com.

I: Starting bootlader

E: failed to openfalsh area ID 1

[Marte Myrvold]

Hi,

Have you made any other changes to the application?

Can you upload the application log from the device? Please upload it using Insert > Code or as a text file with Insert > Image/video/file.

It might also be easier to start with the Matter Template sample and add clusters and functionality as explained in Adding clusters to Matter application.

Best regards,
Marte