Thermistor-with-nRF52840-over-BLE

Getting temperature value from thermistor thru ADC and sending to App over BLE

Use Nordic ToolBox UART to recieve values(available in Play Store)

General instructions

The following instructions are written for Segger Embedded Studio download here https://www.segger.com/downloads/embedded-studio/

1. Go to the following website http://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v15.x.x/ and download v15.2.0
2. After which go to D:\nRF5_SDK_15.2.0_9412b96\examples\ble_peripheral\ble_app_uart\pca10056\s140\ses\ and open .emproject , then automatically segger studio will open along with main.c file
3. Change the main.c file to the attached file.

Merging BLE with ADC

Go to sdk_config.h and search

1. nrf_drv_timer TIMER_ENABLED 1 (enable the timer by replacing 0 to 1), TIMER3_ENABLED 1 (We have enabled timer instance 3 in our main.c)

2. nrfx_timer NRFX_TIMER_ENABLED 1(enable the timer by replacing 0 to 1), NRFX_TIMER3_ENABLED 1 (We have enabled timer instance 3 in our main.c)

3. nrfx_ppi NRFX_PPI_ENABLED 1

4. nrf_drv_ppi PPI_ENABLED 1

5. nrf_drv_saadc SAADC_ENABLED 1

6. nrfx_saadc NRFX_SAADC_ENABLED 1

Then include the following libraries in your main.c , #include""(already in program)

nrf_drv_saadc.h , nrf_drv_timer.h , nrf_drv_ppi.h , nrfx_ppi.h , nrfx_timer.h , nrfx_saadc.h

In your nRF_Drivers (A tab in your left) Search and add the following files

1.nrf_drv_ppi.c

2.nrfx_ppi.c

3.nrfx_timer.c

4.nrfx_saadc.c

The circuit diagram is attached(thermistor-circuit.webp) in which

Vs ==> Vdd (in nRF52840)

Vo ==> Pin No:0.02(in nRF52840)

GND ==> GND(in nRF52840)