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Author Topic: ultrasounds to send and receive Morse code  (Read 1513 times)
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Jr. Member
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OK ! finaly I moved from 0 ! NOW I GET VALUES TO MY SENSOR PIN !  smiley-grin !

the only problem is that they go from 340 to 370 up and down every 2 secconds gradualy ! is there a chance that is an echo or is it normal ?
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Check to see you have the value of that coupling capacitor correct. The 0.1uF that goes between the trannsistor and the op amp. Making that 10uF or 100uF would do that to your signal.
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