wiki.raudys.com

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STM32 STM32F1 STM32F103C8T6

use this tool to erase ram first:

https://circuitdigest.com/microcontroller-projects/getting-started-with-stm32-development-board-stm32f103c8-using-arduino-ide

https://www.st.com/content/ccc/resource/technical/software/demo_and_example/group0/ab/79/74/9a/85/b0/4b/a1/flasher-stm32/files/flasher-stm32.zip/_jcr_content/translations/en.flasher-stm32.zip

use this lib for neopixel

connect data pin to A7