Hello,

please help me

I use arduino uno rev. 3 with this configuration

i have this danger in monitor

and this in serial monitor

I have changed it but not work

i have used this instruction with Arduino UNO

https://wiki.dfrobot.com/SKU_SEN0486_Gravity_Ring_2D_QR_Code_Scanner

but not read

https://www.dfrobot.com/product-2485.html