NeoPixel on stm32f103c8t6 (Blue Pill) use HAL library
To drive data at 5V, it configure PWM output A0 (TIM2_CH1) with mode Open Drain, so you need to add an external pull-up to 5V, something like 2k2.
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NeoPixel on stm32f103c8t6 (Blue Pill) use HAL library
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