When you want to measure the temperature of the surroundings while developing Bluetooth low-energy projects you require an external temperature sensor. implementing external sensors increases the BOM Cost and requires a bit more space. you can avoid these problems by using NRF52832 for your BLE Projects.

in this project, I am measuring the temperature using NRF52DK And displaying the temperature on the LCD Display. for developing the firmware I have used the Arm Mbed.

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The nRF52 Development Kit is a single-board development kit for Bluetooth Smart, ANT, and 2.4GHz proprietary applications using the nRF52 Series SoC. This kit supports both developments for nRF52832 SoCs.

The kit is compatible with the Arduino Uno Revision 3 standard, making it possible to use third-party shields that are compatible with this standard with the kit.

The kit supports the standard Nordic Software Development Toolchain using Keil, IAR, and GCC. The kit also supports ARM mbed tool-chain for rapid prototyping and development using mbed’s cloud-based IDE and tool-chain with an extensive range of open-source software libraries. Program/Debug options on the kit are Segger J-Link Lite for the standard toolchain and CMSIS-DAP for mbed. The kit gives access to all I/O and interfaces via connectors and has 4 LEDs and 4 buttons which are user-programmable. A range of software examples is available from the nRF5 SDK to support Bluetooth Smart, ANT, and 2.4GHz applications.

Pinouts of NRF52DK

• Nordic nRF52 System-on-Chip combining Bluetooth v4.2 compliant 2.4GHz multiprotocol radio, On-chip NFC tag, and ARM® Cortex®-M4F processor on a single chip optimized for ultra-low power operation
• Arduino Uno Rev. 3 compatible connector for use with 3rd party shields
• All I/O and interfaces available via connectors
• USB drag and drop programming and USB Virtual COM port for serial terminal
• Segger J-Link and CMSIS-DAP interface for programming and debugging from offline tools and pyOCD
• pluggable NFC antenna
• Connector for RF measurements
• Pins for power consumption measurements

Accepts power through:

• USB
• External source (1.8V-3.6V)
• Single 2032 coin-cell battery, onboard battery holder
• Accepts power through:USBExternal source (1.8V-3.6V)Single 2032 coin-cell battery, onboard battery holder

nRF52 Series software architecture

The nRF52 Series software architecture offers a clean separation between application code and Nordic’s embedded protocol stacks (called SoftDevices). There are no compile, link, or run-time dependencies. Application code can be developed and compiled independently of the protocol stack. This simplifies overall development efforts and reduces the possibility and complexity of bugs during development.

SoftDevices

The nRF52 DK is supported by a range of protocol stacks. These protocol stacks are known as SoftDevices and complement the nRF52 Series SoCs. SoftDevices can support Bluetooth Low Energy, ANT, or Bluetooth Low Energy/ANT combinations. This brings maximum flexibility to application development and allows the latest stack version and associated features to be programmed into the nRF52 Series SoC.

The interface MCU on the nRF52 DK runs SEGGER J-Link OB or Mbed™ OB interface firmware and is used to program and debug the firmware of the nRF52832 System on Chip (SoC).

The button is also used to enter the bootloader mode of the interface MCU. To enter the bootloader mode, keep the reset button pressed while powering up the DK until LD5 starts to blink. You can power up the DK either by disconnecting and reconnecting the USB cable or by toggling the power switch (SW6)

The onboard interface MCU is factory programmed with a Mbed™-compliant bootloader. This feature makes it possible to swap interface firmware between the factory-preloaded SEGGER J-Link OB and the Mbed interface firmware.

See the IF Boot/Reset button for instructions on how to enter the bootloader mode.

To swap interface MCU firmware, drag the Interface image (.bin) into the mounted bootloader drive on the connected computer and power cycle the DK.

NRF52832 Contains an internal temperature sensor with 0.25 °Celcius Resolution. it can measure the die temperature over the temperature range of the device. Linearity compensation can be implemented if required by the application.

Main Features of the temperature sensor

• The temperature range is greater than or equal to the device's operating temperature.
• The resolution is 0.25 degrees

TEMP register stores measured temperature values, the following steps need to be used while developing firmware.

1. Enable the TASKS_START Register to Start temperature measurement.

2. Check EVENTS_DATARDY Register Temperature measurement complete, data ready

3. Collect the Temperature details from theTEMP register.

• The temperature is °C (0.25° steps).
• Result of temperature measurement. Die temperature in °C, 2's complement format, 0.25 °C steps.
• Decision point: DATARDY

4. Enable TASKS_STOP Register to Stop temperature measurement.

Follow the Link For NRF52832 Datasheet https://infocenter.nordicsemi.com/pdf/nRF52832_PS_v1.4.pdf

To compile the code you need to external libraries

• LCD interfacing With NRF52832( NRFLCD.h)
• Serial Port Interfacing (pretty_printer.h)

Schematic Diagram

Result Video