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A02yyuw ultrasonic sensor testing

hi,
I have recently taken the A02yyuw sensor , I need to test it with esp8266 i have connected it and on the serial monitor i m getting "ERROR" readings .Please help me by giving the suggestion.
thanks in advance
I have recently taken the A02yyuw sensor , I need to test it with esp8266 i have connected it and on the serial monitor i m getting "ERROR" readings .Please help me by giving the suggestion.
thanks in advance