frankmp40:
Hi!
I am making a blind spot detector using a pair of ultrasonic transducers.
On my transmitter part, I use 555 timer and some transistors to generate a 40KHz signal to the transducer
On my receiver part, another transducer receives signal and passes that signal through a couple of amplifiers and filters to a comparator, which then generates a square wave signal
My circuit works well that the receiver can generates a square wave regarding to the transmitter signalHowever, when I connect my transmitter and receiver as show in the http://arduino.cc/en/Tutorial/Ping?from=Tutorial.UltrasoundSensor, it cannot measure the distance, is seems like it cannot measure the time interval between the trig and the echo.
Is that because my circuit cannot respond that quick? (scale of microseconds )
Anyone can help?
Thank you!
I'd also like to see your test sketch.
Tim