ultrasonic range finder circuit

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Transistorman

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if there was
i found a store that sell with only transmitter and receiver
**broken link removed**
without know how to make the , before i buy it
i want to know how to make the circuit first
 
Last edited:
Transistorman said:
my robot will stop if the USRF hit the maximum range
it will stop/sleep until a next sign

edit :
i reading the article in A Cheap Ultrasonic Range Finder but the timing make me confuse
Click to expand...

hi,
The PIC pulses the TXR sensor at 40/42kHz for a short burst of pulses, at the same time the PIC starts an internal counter.
The RX sensor detects the 40/42kHz echo pulse, the PIC stops the counter.
Knowing that the speed of sound in air is approx 340mtr/sec it can calculate the total distance [to the target and back] from the time period in the counter.
So half the total distance is the range to the reflecting target.

OK.?
 
Last edited:
Just payed 16$ and got my unit ....
No matter what you will do , it will cost you allot more.
**broken link removed**
 
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