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How can I interface two HC-SR04 ultrasonic distance sensor with PIC 16F877A using a single timer (timer 1) ?
You can do that. Just need to read one by one. See below.
- Send trigger to first HC-SR04
- Start timer
- Listen for echo.
- Stop timer once you got the echo
- Convert timer value to distance (first distance)
- Send trigger to second HC-SR04
- Start timer
- Listen for echo
- Stop timer once you got the echo
- 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.
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