Building an automated attendance system using ESP32-CAM is a practical, affordable way to solve this problem for classrooms, ...
#define ARDUINOJSON_DO_CONCAT(A, B) A##B #define ARDUINOJSON_CONCAT2(A, B) ARDUINOJSON_DO_CONCAT(A, B) #define ARDUINOJSON_CONCAT3(A, B, C) \ ARDUINOJSON_CONCAT2(A ...
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