hello guys,
im on a project where i need to find distance between a TX and RX
im planning to use ultrasonic transducer pair(not the ones on the same board with on board processing as i need tx nd rx separate) for the same.
searching the Internet i found the transducer pair more or less looking the same!.
is the Tx and Rx same? and can be interchangeably used?
anyone give information on how the received signal would be? (pulse, analog etc.)
have anyone got a better idea to find distance between Tx and Rx?
The 40kHz Murata transducers used to be marked with a T or an R.
anyone give information on how the received signal would be? (pulse, analog etc.)
Tiny and analogue.
Thank you,
so the Tx and Rx are unique and cannot be used interchangeably right?
by the way i guess i need to have 40Khz pulse generator(555) or clock required for the operations
any other peripheral circuitry actually required? apart from amplifiers?
have anyone got a better idea to find distance between Tx and Rx?
A yardstick or tape measure?
i suppose tape measurement can`t be automated sir,
PaulS:
have anyone got a better idea to find distance between Tx and Rx?
A yardstick or tape measure?
Why would this distance be important to you?
I haven't tried, but it looks to me like the sensors on a Parallax Ping or equivalent could be de-soldered with some care. If it were my project, I would try wiring the transmit transducer on a length of twisted pair and set the two up facing one-another. The one I have handy is a Seeedstudio unit, and it has the T and R transducers conveniently labeled. They run about $14, so it's not a huge investment to experiment.
gardner:
I haven't tried, but it looks to me like the sensors on a Parallax Ping or equivalent could be de-soldered with some care. If it were my project, I would try wiring the transmit transducer on a length of twisted pair and set the two up facing one-another. The one I have handy is a Seeedstudio unit, and it has the T and R transducers conveniently labeled. They run about $14, so it's not a huge investment to experiment.
In place of the twisted-pair wire you could use a radio link. See this example on The Ben Heck Show:
The distance measurement is critical because im trying to find the coordinates of that particular point in the transmitter using trilateration.
how can we use radio signals for distance measurement? is it feasible?
how can we use radio signals for distance measurement? is it feasible?
It is feasible, but you may find the extra expense unacceptable.
What sort of range do you need to measure and to what degree of accuracy?
i just need around 5m maximum.how do we find the distance by radio waves ?
around 5m maximum.how do we find the distance by radio waves ?
Don't bother.
Round-trip time is about 33 ns or half an Arduino clock cycle.
So sir ive got to work around with arduino timer? accuracy would be less is`nt it?
for that reason i started thinking about ultrasonic pair but im nt having much info how the supporting circuitry would be or atleast how the waveform would be so as to process it..
It used to be possible to find schematics for all sorts of ultrasonic projects.
Try the Devantech SRF04
sreejithu4u:
So sir ive got to work around with arduino timer? accuracy would be less is`nt it?
for that reason i started thinking about ultrasonic pair but im nt having much info how the supporting circuitry would be or atleast how the waveform would be so as to process it..
You could do what Ben Heckendorn did: use two Ping sensors, one for the transmitter where the receiver is removed and one for the receiver where the transmitter is removed.
hmm i guess i`d have to..well thank you guys thanks for helping 
regards
guys one more doubt,you were telling that i need to desolder a Tx from a range finder and then desolder Rx from another one so that it would be easier isnt it?
sreejithu4u:
guys one more doubt,you were telling that i need to desolder a Tx from a range finder and then desolder Rx from another one so that it would be easier isnt it?
Yes. That's how Ben Heckendorn did it. Much easier than designing your own ultrasonic sender and receiver.
Some sensors allow you to only ping or only listen.
The SRF02 from Devantech is one, I think.
Yes. That's how Ben Heckendorn did it. Much easier than designing your own ultrasonic sender and receiver.
thanks so on the transmitter i just need to worry about sending the pulse and in reciever only about looking at echo pin r8? hopefully i could get my hands on rangefinder here in india
Some sensors allow you to only ping or only listen.
The SRF02 from Devantech is one, I think.
thanks for the info my friend,i`l look into it