| .. _ht16k33: |
| |
| HT16K33 LED driver with keyscan |
| ############################### |
| |
| Overview |
| ******** |
| |
| This sample controls the LEDs connected to a `Holtek HT16K33`_ |
| driver. The sample supports up to 128 LEDs connected to the |
| rows/columns of the HT16K33. |
| |
| The LEDs are controlled using the following pattern: |
| |
| 1. turn on all connected (up to 128) LEDs one-by-one |
| 2. blink the LEDs at 2 Hz, 1 Hz, and 0.5 Hz |
| 3. reduce the brightness gradually from 100% to 0% |
| 4. turn off all LEDs, restore 100% brightness, and start over |
| |
| The sample logs keyscan events on the console. |
| |
| Building and Running |
| ******************** |
| |
| Build the application for the :ref:`nrf52840dk_nrf52840` board, and |
| connect a HT16K33 LED driver at address 0x70 on the I2C-0 bus. |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/drivers/ht16k33 |
| :board: nrf52840dk_nrf52840 |
| :goals: build |
| :compact: |
| |
| For flashing the application, refer to the Flashing section of the |
| :ref:`nrf52840dk_nrf52840` board documentation. |
| |
| References |
| ********** |
| |
| .. target-notes:: |
| |
| .. _Holtek HT16K33: http://www.holtek.com/productdetail/-/vg/HT16K33 |
