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Add note for nRF52840-dk board details

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This commit is contained in:
James Munns 2025-01-02 18:23:34 +01:00
parent 2c87b31395
commit 41790316eb
1 changed files with 10 additions and 0 deletions
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10
examples/nrf52840/src/bin/pwm_sequence_ws2812b.rs
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@ -14,6 +14,16 @@ use {defmt_rtt as _, panic_probe as _};
// https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf. // https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf.
// This demo lights up a single LED in blue. It then proceeds // This demo lights up a single LED in blue. It then proceeds
// to pulsate the LED rapidly. // to pulsate the LED rapidly.
//
// /!\ NOTE FOR nRF52840-DK users /!\
//
// If you're using the nRF52840-DK, the default "Vdd" power source
// will set the GPIO I/O voltage to 3.0v, using the onboard regulator.
// This can sometimes not be enough to drive the WS2812B signal if you
// are not using an external regulator. If you set the board to "USB" power
// instead (and provide power via the "nRF USB" connector), the board will
// instead power the I/Os at 3.3v, which is often enough (but still out of
// official spec) for the WS2812Bs to work properly.
// In the following declarations, setting the high bit tells the PWM // In the following declarations, setting the high bit tells the PWM
// to reverse polarity, which is what the WS2812B expects. // to reverse polarity, which is what the WS2812B expects.