Interfacing nRF52840 with ADXL335 Accelerometer.

[Abhimanyu K K]

Sir,

I have one nRF52840 DK and ADXL335 accelerometer. I need to get the 3-axis values, Xout, Yout & Zout, from the accelerometer and send through BLE to my nRF mobile app.

Which program and SDK I want to use for this?

Please reply ASAP.

[Jared]

Hi,

The BLE app uart example would be a good starting point. You can read the output from the accelerometer by using GPIO as input. The values can then be sent using ble_nus_data_send(). 

Best regards

Jared 

[awneil]

Abhimanyu K K said:

Which program and SDK I want to use for this?

If you go to the Product Page for the nRF52840 it has links to the appropriate SDK, SoftDevices, etc ...

https://www.nordicsemi.com/Products/Low-power-short-range-wireless/nRF52840

Jared said:

You can read the output from the accelerometer by using GPIO as input

Specifically, you will need to use the AIN analogue inputs, and the Analogue-to-Digital converter.

See the nRF52840  Product Specification for details, and look at the Examples in the SDK

[Abhimanyu K K]

Sir can we read the sensor values directly using nrf_gpio_pin_read()? 

Or whether I need to configure ADC?

[awneil]

nrf_gpio_pin_read() is just a digital read:  ie, it just tells you whether the pin is at a logic low or high level - '0' or '1'; true or false ...

If you want to read an analogue value, you need to use an Analogue-to-Digital Converter (ADC).

[Abhimanyu K K]

How to configure ADC?

Is there any example programs which read analogue values and print on uart or ble?