Lab 19. Blinking LEDs

Owned by Thomas Watteyne
Last updated: Oct 31, 2023
2 min read

Project 01bsp_gpio_wave is a standalone project for the AIOT Play (i.e. the Play doesn’t join the network) which toggles all of the GPIO pins in a round-robin fashion, with a 125ms delay. In this lab, you will build and run that project on your AIOT Play, connect an LED to the prototyping area, and see the LED blink.

 

What is a GPIO?

“GPIO” means “General Purpose Input/Output”, and refers to the pins on the expansion header.

Open the project

In the source code, double-click on the aiot_play_fw.emProject file

This open SEGGER Embedded workbench (you may need to accept the license agreement).

 

Make 01bsp_gpio_wave the active project

The pane on the left title “Project Items” lists the different projects you can build in this workspace. By default, the first project in alphabetical order is active (bold). Right-click on “Project ‘01bsp_gpio_wave’” and select “Set as Active Project” to make is active.

before

after

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Connection

  1. Connect the nRF52840-DK to the AIOT Play

  2. Connect an LED according to the schematics

  3. Put batteries in the AIOT Play

  4. Plug in the nRF52840-DK

  5. Switch the nRF52840-DK on

  6. In Segger, select “Build and Debug” which will compile the project and load the resulting binary on the AIOT Play

  7. The LED blinks vigorously

Congrats! You have build your first circuit and programmed your AIOT Play to control it!!!