![]() Nordic provides a free, handy test tool, nRF Connect for Mobile, that's available for both Android or iOS. To test this example sketch, you'll need another device - either computer or smartphone - connected to your nRF52840. Write the new button state to the bleuart TX charīefore uploading, make sure you've selected SparkFun Pro nRF52840 as your board (or "Adafruit Bluefruit on nRF52840DK PCA10056" if you didn't install the SparkFun board definition. Int buttonState = digitalRead(BUTTON_PIN) 1 number or character, turn the LED on: 0 number or character, turn the LED off: If the character is one of our expected values, Print out the character for debug purposes: use bleuart.read() to read a character sent over BLE Start advertising device and bleuart servicesī(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE) ī(bleuart) ī(true) Uncomment the code below to disable sharing PinMode(LED_PIN, OUTPUT) // Turn on-board blue LED off Serial.begin(9600) // Serial is the USB serial port Define hardware: LED and Button pins and states * on-board LED on/off, or read from to monitor the * The BLE UART service can be written to to turn the * Using a BLE development app like Nordic's nRF Connect * library to both send and receive data to the * This example demonstrates how to use the Bluefruit * BLE Example for SparkFun Pro nRF52840 Mini To get the example, copy and paste the below into a new Arduino sketch in your IDE (or get the latest version in our GitHub repo): language:c ![]() This example allows you to toggle the LED and read the pin-13 button status using a BLE app on your mobile phone. Blinky Button BLE Example CodeĪs if you don't already have enough examples, we wanted to provide a simple example that demonstrates how to control and interact with the nRF52840's hardware components over a BLE connection. One suggestion, if you want to start simple, is the peripheral/blinky_ota example. Browse the exhaustive list of examples by navigating to File > Examples > Adafruit Bluefruit nRF52 Libraries. The nRF52 Arduino core includes the Bluefruit nRF52 Libraries which can be used to turn your nRF52840 into a BLE peripheral and/or central device. But, if you've done any Arduino development before, those may not be all that exciting. Using the Arduino nRF52 cores, you can program digitalWrite I/O, analogRead ADC pins, Serial print to the Serial monitor, interact with hardware serial using Serial1, and even perform more complex I 2C or SPI writes with the Wire and SPI libraries. Nothing should be overwritten, but a new "sparkfun_nrf52840_mini" directory should be added in. Then copy the contents of the "variants" folder in this directory into the "variants" folder of the original directory. # Ram & ROM size varies depending on SoftDevice (check linker script) Sparkfunnrf52840mini.name=SparkFun Pro nRF52840 Mini Scroll to the bottom and paste the below into the bottom of that file: language:text If you installed the core manually into your Arduino sketchbook, it'll be in "hardware/adafruit/nrf52". Linux: ~/.arduino15/packages/adafruit/hardware/nrf52/.OS X: ~/Library/Arduino15/packages/adafruit/hardware/nrf52/.Windows: %LOCALAPPDATA%\Arduino15\packages\adafruit\hardware\nrf52\.If you installed via the board manager it'll probably be in one of these folders: To place the files, first navigate to your Adafruit nRF52 core installation. You can grab the latest version of these files from our GitHub respository or by clicking the button below and unzipping the ZIP files contents:ĭownload the SparkFun nRF52840 Arduino Board Definitions To add SparkFun nRF52840 board support to the nRF52 Arduino core, one file ( boards.txt) needs to be modified, and one new folder ( variants/sparkfun_nrf52840_mini) needs to be copied in. If you'd rather skip this step – even temporarily you can use Adafruit Bluefruit on nRF52840DK PCA10056 as your board selection. SPI to pins 31 (MISO), 3 (MOSI), 30 (SCK) – again matches the Arduino Pro Mini pinout.Important if you're using the qwiic connector. Hardware Serial ( Serial1) to pins 17 (TX) and 15 (RX) to match the Arduino Pro Mini pinout.They'll help to route the following serial buses and pins: Most significantly, these board definitions help define pin-routing. The addition of these board modifications are not required for uploading code to your nRF52840 via Arduino. Why the SparkFun Pro nRF52840 Mini board definitions?
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