distance sensor

Hello boys and girls,

I am looking for a distance sensor making a parking system for my car.
Does anyboby suggest me any sensor using it with 16f628.I want to keep the cost down.

Thanks
Nikos

Hi Nikos,

You should get the book called "Experimenting with the PICBASIC PRO compiler" by Les Johnson. He has an example program called SON_PROX.bas complete with schematics and explanation. It uses 2 ultrasonic transducers modulated at 40 kHz. The circuit uses an op-amp to amplify and convert the received sound into a TTL voltage and a transistor to adjust the sensitivity back to the pic. That's a pretty low parts count. He's using a PIC16f84 micro so a 628 will work. He reports that his set-up will give a sensitivity of approximately two feet. Ultrasonic transducers are what most of the commercial units use for back-up sensors if I'm not mistaken. Let me know how you make out.

Good Luck
jessey

Thanks

I have just find the book you suggest me.
I will look on it and I will let you know.

Regards
Nikos