Reply To: Interfacing 2 HC-SR04 to PIC Microcontroller

You can do that. Just need to read one by one. See below.

1. Send trigger to first HC-SR04
2. Start timer
3. Listen for echo.
4. Stop timer once you got the echo
5. Convert timer value to distance (first distance)
6. Send trigger to second HC-SR04
7. Start timer
8. Listen for echo
9. Stop timer once you got the echo
10. Convert timer value to distance (second distance)

So it is easy. A microcontroller can do above steps very fastly, so it will appear to you that both sensors are reading simultaneously.