dc42:
teckel:
Many have asked how to build such a firing/measuring circuit, but realistically it is far too complex to do.FWIW I'm currently bouncing ultrasonic pulses from a cheap 40kHz transducer off the ceiling of my office, and detecting the reflection without difficulty. Range to the ceiling is about 1.7m. I'm driving the transducer directly from an Arduino PWM pin via an inductor and capacitor, so it's only getting a little over 5V p-p. I'm using a high-bandwidth dual op amp to amplify the received signal by about 2000, and feeding that to the ADC to detect the signal (which involves running the ADC at a clock rate above the recommended 1MHz, so that I can sample at 80kHz). Running the transmitter at higher power (e.g. the 30-50V that MarkT suggests) would allow me to use lower gain in the receiver, or obtain increased range.
Hi, dc42, are you able to teach me how you send the pulses off a transducer and detect their echo? For short distance application like 1m. I am trying to implement this usage and after some googling I came to this arduino page. Thanks.