Piezo Ultrasonic transducer driver

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brimsant

New Member
Hi guys

Can someone take a look at this schematic and see if there are any glaring issues with it? I'm pretty new to circuit design so most of what I have is from looking at the designs of other people.

Basically what I want to do is to program the PIC to read the temperature from the Thermistor and then driving a piezo ultrasonic transducer through Frequency Shift Keying to send the reading.

I am planning on using this transducer: https://abra-electronics.com/sensor...sor-16mm-1-pair-transmitter-and-receiver.html
 

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Yes, RA2 looks fine - but another point, why use a crystal?, the PIC has a perfectly satisfactory internal oscillator which is accurate enough for driving a piezo.

However, I'm a bit puzzled about the use of the piezo transducers?, it seems a pretty strange and unreliable method of communication?, and requires fairly precise alignment.
 
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