ultrasonic range meter

[bloody-orc]

Hi there!
I'm planing to build a ultrasonic range meter for my robot.
I searching for easy schematics, that i could use with my pic(axe). Has anyone some good schematic?

aslo i would like to know, how is this programming done?
*pulseout
*reading?
*calculating the value into cm's(how do i do that?)
*sending data to lcd\PC(this is the part i know )

any good links\tutorials?
all help is accepted.

 

[Roboticinfo]

reply

**broken link removed**

 

[bloody-orc]

do you know if it works also?
all other i have seen have a amp on the Tx part aswell. why is there none. And still when i use tjhis what should my software look like?

has anyone any idea on the schematic that those modules have? they are only 3pin'ers 1 for gnd 1 for v++ and one sends out pulses, that i mesure. is this hard to make? this would be ideal for me

 

[DigiTan]

I had a schematic like that from a McGraw-Hill book on BASIC Stamps. Their code was in BASIC of course, but it still might be useful. I'll check for thier link or a .gif for you if you're interested.

 

[Roboticinfo]

reply

The circuit works there is no need to.

 

[bloody-orc]

ok if it wors, then how should the software look like in the pic(axe)?
and also, why is the Tx connected to 2 output pins? can't i use only one?

 

[Roboticinfo]

reply

The software is on that page

 

[bloody-orc]

ok this is written in language i can't understand. could someone make me a summary maybe? like what i must do. i saw a lot of nap'ing there... like what is this for etc. i dont need this lcd thingy also. i just need to get a mesurment in one byte in cm's

 

[Nigel Goodwin]

why is the Tx connected to 2 output pins? can't i use only one?

It's a bridged output stage, it gives TWICE the drive voltage to the transducer - in this case, 10V p-p rather than 5V p-p - this gives four times the power output!.

You 'could' use just one pin, but only giving quarter the power.

 

[bloody-orc]

oki-doki

but now the software problem.
What stages must i go through?
wrom where to where is this code sending\recieving the U\S beams? and how is it sending it?

**broken link removed**

 

[Nigel Goodwin]

oki-doki

but now the software problem.
What stages must i go through?
wrom where to where is this code sending\recieving the U\S beams? and how is it sending it?

**broken link removed**

I don't see the problem?, the code is very well commented, with the transmit and receive routines clearly named.

 

[bloody-orc]

yes for you it is easy, but i dont speak this language. for me it's chinease(i'm not from asia). i need it written in english.
like this:
pulseout 10ms pulse from pin 3
wait\nap\pause
togle pins
pulseagain something
wait\pause\nap
read something (what i must read? must i count or mesure? how?)
calculate (how?what?)

 

[Roboticinfo]

reply

That is pretty easy to follow

what language do you use?

basic,C++ and elec?

 

[bloody-orc]

kinda basic but i use programming editor, the picaxe language, what is kinda like writing english. there is no calibrating or something like that. Thats why i need this. In the summer i plan to at least try to learn this basic.

 

[addyismad]

google search for srf04 module...

 

[akg]

Re: reply

http://www.eng.uah.edu/~wells/cpe437_sp_00/hrf/circuit_schematic.htm

I' getting a 404 from here !!!!