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BPI gpio expansion board is the base GPIO board, also can use on Micro:bit.
schematic diagram download link: |
Google drive link: https://drive.google.com/file/d/1e7NrvLUf3FLvaauWZ5NtPzKxT332gkfA/view?usp=sharing
Baidu cloud link : https://pan.baidu.com/s/1Zt20GA_kTGt9w8WDHiWgfA
buy sample frome BPI official aliexrpess shop