Getting Started with WeMos D1 Mini Tutorials – Pinout And Specs

11 digital input / output pins, all pins with interrupt / PWM / I2C / support 1 line (except D0); 1 analog input(3.2V max input). Micro USB

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WeMos D1 Mini Pinout Reference - Last Minute Engineers

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Check the solderings of a WeMos D1 Mini