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Author Topic: Can I make a board to handle these!  (Read 3287 times)

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Offline Joker94Topic starter

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Can I make a board to handle these!
« on: November 03, 2009, 04:44:13 AM »
I was thinking, am i able to take ultrasonic sensors from futurlec and hookit up to my MCU and recieve readings from it.

http://www.futurlec.com.au/Ultrasonic_Sensors.jsp

what do i have to do to get this thing up and running.

Offline SmAsH

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Re: Can I make a board to handle these!
« Reply #1 on: November 03, 2009, 05:02:25 AM »
Ah, the futurlec sensors return...
Well, for starters you would have to send an output pulse through the emitter then receive the pulse through the detector... Pretty simple stuff... Then you have to do the math that determines how far the object is...
Which goes something like:
Quote
Speed_of_Sound * Time_Passed / 2 = Distance_from_Object
343 m/s * .03 s / 2 = 5.145 m
Of coarse the fact that these sensors have no datasheets doesn't really help things at all...
If you can, try and dig up some info about these, i tried a while ago and couldn't find any so i passed on buying them.
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Offline billhowl

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Re: Can I make a board to handle these!
« Reply #2 on: November 03, 2009, 06:24:15 AM »
You will need circuit like this to make the sensor work


This is a simple system. The transmitter emits an ultrasonic signal
(40kHz). The 555 timer chip of the transmitter provides the driving
40kHz signal. Every time the reset pin (pin4) of the 555 timer goes
high, a resulting signal of 40kHz on pin 3 is used to drive the
ultrasonic transducer. Then, the receiver simply listens for the return
echo after it bounces off an object. The small echo signal, when
detected, is amplified 1000 times using a standard operational
amplifier (LM741 op-amp). The signal is then fed into a tone
decoder (LM567) set to lock onto a 40kHz signal. The output of the
tone decoder is HIGH when no echo is heard and swings LOW
when an echo is detected. The output from the tone decoder can
now be fed into a microcontroller or some other type of IC to
determine when an echo was received. To help minimize false
triggering, the output is fed into a voltage comparator set to trigger
at the appropriate level. The LED at the output of the comparator
acts as a visual indicator when an echo is detected (very useful
when debugging). The typical range of this system is from a few
inches to 5-6 feet, depending on the quality of the components,
shielding, and most important, tuning.
« Last Edit: November 24, 2009, 07:26:37 AM by billhowl »

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #3 on: November 04, 2009, 03:54:27 AM »
Ok

I'll first e-mail them and see if i cannot find out any more info.

So billhowl, is it as simple as making the two circuits you posted and attaching it to my mother board

Of coarse the fact that these sensors have no datasheets doesn't really help things at all...
If you can, try and dig up some info about these, i tried a while ago and couldn't find any so i passed on buying them.

do you have any sonar/ultrasonic sensors and if so where did you get them from.

I like alot of other people don't have the biggest budget and i love to build my own circuitry (i love electronics).

Offline SmAsH

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Re: Can I make a board to handle these!
« Reply #4 on: November 04, 2009, 04:56:42 AM »
I know, its hard as hell to get decently priced ultrasonic sensors over here :-\
You would have to use a circuit similar to the one billhowl posted, check with futurlec about the sensors and see if you can get a datasheet or something, this will help immensely!
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Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #5 on: November 04, 2009, 05:01:15 AM »
I know, its hard as hell to get decently priced ultrasonic sensors over here :-\

I know

i have sent them and email asking if they have any additional info and if not are they able to tell me who thier supplier is so i can have a better look into it. We will just have to wait and see what they say.

Offline SmAsH

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Re: Can I make a board to handle these!
« Reply #6 on: November 04, 2009, 05:02:43 AM »
If you get anything such as datasheets or additional docs be sure to post them, im very keen to have a go at using these sensors sometime...
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Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #7 on: November 04, 2009, 05:03:59 AM »
I sure will post them. ;D

Offline SmAsH

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Re: Can I make a board to handle these!
« Reply #8 on: November 04, 2009, 05:07:28 AM »
Cheers. ;D
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Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #9 on: November 06, 2009, 03:37:35 AM »
got a reply today with some data sheets. have not read them yet as i have just got them but i thought i should post them before i get distracted.

I just posted what she sent me. I hope this helps Smash and others.

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #10 on: November 06, 2009, 03:43:01 AM »
now that i have read them, all it is is what they have listed on the web site.

Offline billhowl

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Re: Can I make a board to handle these!
« Reply #11 on: November 06, 2009, 06:59:17 AM »

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #12 on: November 24, 2009, 01:26:18 AM »
well i am going to use the shematic that billhowl first posted.

1 qestion, how do i hook up the wires to my MCU. I gather i'll hook the transmitter 5v's to the poitive pin of the sensor bus and the same with the negative. But there is a frequency test and ping put and i am notsure how they hook up.

2, do i just plug the transmotter and reciever into 2 different pugs or is there a way to do it with one pin.

thanks Joker94

Offline SmAsH

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Re: Can I make a board to handle these!
« Reply #13 on: November 24, 2009, 01:32:49 AM »
1. I think the "ping" would go to the mcu pin, not sure about the receiver though...

2. With this you will have to use two pins.
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Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #14 on: November 24, 2009, 03:40:58 AM »
i though i would but i should still have enough.

Offline billhowl

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Re: Can I make a board to handle these!
« Reply #15 on: November 24, 2009, 07:15:09 AM »
1. "ping" connection will go to MCU digital output, when "high" will send 40KHz out, Freq test is for you to test the output freq, make sure is 40KHz by adj the R1(10K ohms).

2. For the receiver, you can connect the pin 8 of LM567 to MCU analog digital input. the LED will light up when there is echo.

3. Is will be easy for control if you use two pins of MCU.
« Last Edit: November 24, 2009, 07:29:37 AM by billhowl »

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #16 on: November 25, 2009, 01:35:17 AM »
great thanks for thatbillhowl.

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #17 on: November 28, 2009, 04:52:01 PM »
can i use the lm741 instead of the lm7414 as i cannot get a 7414 from futurlec
t

Offline billhowl

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Re: Can I make a board to handle these!
« Reply #18 on: November 29, 2009, 07:19:16 AM »
That is the Op Amp LM741 and not LM7414, the 4 you saw there is the pin 4 of LM741 which connect to Gnd.

Offline Joker94Topic starter

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Re: Can I make a board to handle these!
« Reply #19 on: November 29, 2009, 03:07:46 PM »
great thanks for that

 


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