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HT16K33 LED driver with keyscan


This sample controls the LEDs connected to a Holtek HT16K33 [1] 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 nRF52840 DK board, and connect an HT16K33 LED driver at address 0x70 on the I2C-0 bus.

west build -b nrf52840dk/nrf52840 samples/drivers/ht16k33

For flashing the application, refer to the Flashing section of the nRF52840 DK board documentation.