Discussion in "General help Guidance and Discussion" started by    guitar    Aug 27, 2008.
Wed Aug 27 2008, 04:49 pm
#1
hi
plz suggest a distance measuring sensor .i want its interfacing with atmega 16
i require to measure distance of 0-15cm.
 Satyanarayana like this.
Wed Aug 27 2008, 07:58 pm
#2
one crude method for distance measuring is by using an ultrasonic transducer. the principle is that u send a burst of ultrasonic wave in the direction of the object and it is reflected back to the ultrasonic receiver. by measuring the time delay from transmission to reception, u can measure fairly accurately the distance of the object. the drawbacks are:
1.the object should be sufficiently large enough to reflect the waves.
2.the measurement depends upon the medium of propagation (the speed of ultrasound varies with the medium). For air it is approximately equal to 330m/s.

note that u get a ultrasonic pair with a defined centre frequency (usually just above the audio range i.e between 30khZ and 45khz). and u may have to create the frequency using the AVR.




[ Edited Wed Aug 27 2008, 08:13 pm ]
 Satyanarayana like this.
Wed Aug 27 2008, 07:59 pm
#3


hi guitar,

you can use Ultrasonic TX and Rx pair to find distance, but it would need some calibration
Wed Aug 27 2008, 08:46 pm
#4
what about an ir or lrd sensor......cheap and easy to build


[ Edited Wed Aug 27 2008, 08:48 pm ]
Thu Aug 28 2008, 09:10 am
#5
@ atul,
what is the principle involved in converting an IR signal to an equivalent distance measurement???
please post the method/principle involved (if possible) because the principle of measuring propagation time of the signal is definitely ruled out as the IR signal travels at the speed of light which is too fast for even for the fastest uC to respond to.e.g. for the signal to travel a distance of say 30cm, the IR signal would take roughly 1nanosecond.
Thu Aug 28 2008, 10:00 am
#6
Hi,I am new user.Can U send me if any microcontroller based projects are there with interfacing
Thu Aug 28 2008, 11:30 pm
#7
hi satya ,
welcome to the community.
check the download section:
http://www.8051projects.net/download.html
all of them are uC based projects.
If u have any doubts on their working, search for the appropriate topic on the forum ( where ur doubts ma have been raised by some other member and the solution already suggested) and if ur doubts are still not cleared,post it on the forum on the appropriate section by starting a new thread.
good luck :-)

P.S. ur post above was not the appropriate place it could have been well suited on the welcome forum topic . Do take care of that while posting in future.
anyways, i m sure u will enjoy ur experience in Rickeys world of microcontrollers.


[ Edited Thu Aug 28 2008, 11:32 pm ]
Fri Aug 29 2008, 12:34 am
#8
[topic moved to general help and guidance forum]
Fri Aug 29 2008, 09:04 pm
#9
hi
plz give me some info about ultrasonic transducers any datasheet link or their pin configuration
if poosible then tell me its interfacing with atmega 16.
Sat Aug 30 2008, 12:45 am
#10
@ guitar,
the pinout of utrasonic transducers and their specifications vary with the manufacturer and should be provided by the vendor/manufacturer along with the sensor itself. So when u enquire about the sensor pair , be sure to get the specifications of the sensor.

I myself had done a project on ultrasonic distance measuring/object counting and used a ultrasonic transducer pair operating at 33khz interfaced to a 8085 uP(8051 core uCs were a rarity in those days as the technology itself had just entered the indian market at that time! the only manufacturer was intel with the 80c31 and the 87c51 series.). Had purchased it in mumbai itself from a company called pulse echo systems and the company had sent all the details but that was a long time ago ( more than 10 years back. even the firm does not seem to exist anymore!!!).
If u have understod the principle involved, i don't think it would be very difficult for u to interface it to the AVR .
just start on something ( like first trying to procure a sensor with the specifications) and we will guide u.
good luck.


[ Edited Sat Aug 30 2008, 12:59 am ]

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