STEP1:  E-pager Gen QR Code for Test



STEP2: Assembly board for Test

Because originally using ESP32CAM a problems with slow 
reading In low light,Therefore finding a device 
that can be used instead

QR Code :   Cod fly aibcy yhd -9800
RS232  Pin out
Circuit:

https://github.com/YakrooThai/Door-access-QR-code/blob/main/qryou.ino

Source Code Test


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