ultrasonic sensor HC-SR04 interface with arduino

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Harish Achar

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Hi,

I am using 2 ultrasonic sensors consider it at A and B. Which are placed in opposite directions.
I will initiate trigpinA and want to read pulse from echopinB (not echopinA). How do I do that?
I am getting 0 value. Sensor works for trigpinA and echopinA. Not working for trigpinA and echopinB.
Please suggest.
 

Post your code and schematic....
 

I guess it's not possible. HC-SR04 is not designed as detector for externally generated pulses. What do you want to achieve, tof measurement?
 

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