Robotic obstacle detection - Electronic Circuits Projects Diagrams Free

infinity · 25th August 2004, 03:35 PM

Hi!
I am doing a project on robotic obstacle detection. I need sensors that can be used for the robot to be able to detect objects from a distance.Please give me the sensor numbers and their costs.

bloody-orc · 25th August 2004, 04:46 PM

well i cant give you any numbers or costs but sensors wat you must look for are ir sensors and ultrasonic sensors. ultrasonic sensors sensors are better but they cost more.

falleafd · 26th August 2004, 03:45 PM

IR rangefinder can be GP2D12
ultrasonic rangefinder can be SRF04 .. SRF08 (if you are in Singapore), or Polaroid 6500. I used Polaroid 6500.

GP2D15 or GP2D120 is not rangefinder, but you still use it to detect obstacles in other ways.

infinity · 28th August 2004, 03:43 PM

I have come across an IR receiver-sensor TPOS 1738. But its range is 35m. But thats the one that is readily availabl here. Do u think it can work for a lower range by making some modifications?

JFDuval · 28th August 2004, 11:14 PM

Hi!

35m is with a high current pulsed IR led from a tv selector. With reflexion, 35m is impossible. The distance is adjustable directly by the current passing trough your IR led.

infinity · 25th September 2004, 08:34 AM

I need help for using this IR Receiver TSOP 1738 as a range-finder.Will its sensitivity differ at different frequencies? Please suggest me some good website where I can find guidance.

JFDuval · 25th September 2004, 11:22 AM

Hi!

You can see one of my montages at machivi.ma.cx. Just flip the 2233 to a 1738 ans adjust the frequency of the 555.

infinity · 27th September 2004, 03:21 PM

Hi
Your website is in a language, I cannot understand. Please tell me how to translate it in English. Also please specifically answer the question " Can TSOP 1738 be used as a rangefinder?"

JFDuval · 27th September 2004, 04:27 PM

Hi!

My website is in French. You can une Google to translate it. And yes it can be use for a rangefinder.

subhasis · 29th September 2004, 06:37 AM

hi,
i am new here. i want to use ultrasonic sensors..... for obstacle detection. i have thought of using acroname's ...SRF08 for my work....
i want to use the data provided by the rangefinder, in a c++ program and use it in a path planning algorithim. can anybody help me regarding this.... i am giving a statement of the problem i am dealing, here...

The problem is defined below...
I have to mount the sensor in a Wheeled Mobile Robot.
Given an initial and final posture of the vehicle, that the robot
has to reach in an environment having unknown obstacles. The
obstacles r randomly scattered n the vehicle has no prior knowledge
of them. The vehicle has to sence the obstacles and their distance so
that the distance data can be used to decide the path on the basis of
that information. For this the distance measurement has to be done
from a reasonable distance with good accuracy. The sensor will be
mounted on a servo to loacate its angular orientation with respect to
the reference orientation. This way, the vehicle will move on the
basis of the sensor data till it reaches the destination point.
I guess my usage of the meter is quite clear. So anyone, who has
worked on a similar thing can please help me. I want a very accurate
sonar, which could communicate with the computer through serial port.
I want to use the data in a C++ program. So a good tutorial is also
needed.

Please also tell me, which method of distance measurement is more suitable. I do not want to use vision. If you have any specific technique, please let me know.

Subhasis

infinity · 29th September 2004, 05:17 PM

Can you please further elaborate on how TSOP 1738 can be used as a rangefinder? Will its output change at different frequencies?Will its sensitivity change at different freuencies? Will it be able to detect obstacles at different distances at different frequencies?

infinity · 29th September 2004, 05:22 PM

Check out this link

http://www.roboticsindia.com/modules...article&sid=35

There is a graph of receiver sensitivity of TSOP1740 on it.
The graph shows that receiver sensitivity varies with frequency. Can you give me more information related to this?

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25th August 2004, 03:35 PM	(permalink)
infinity	Robotic obstacle detection Hi! I am doing a project on robotic obstacle detection. I need sensors that can be used for the robot to be able to detect objects from a distance.Please give me the sensor numbers and their costs.

25th August 2004, 04:46 PM	(permalink)
bloody-orc	well i cant give you any numbers or costs but sensors wat you must look for are ir sensors and ultrasonic sensors. ultrasonic sensors sensors are better but they cost more.

26th August 2004, 03:45 PM	(permalink)
falleafd	IR rangefinder can be GP2D12 ultrasonic rangefinder can be SRF04 .. SRF08 (if you are in Singapore), or Polaroid 6500. I used Polaroid 6500. GP2D15 or GP2D120 is not rangefinder, but you still use it to detect obstacles in other ways. __________________ Falleaf mail@falleaf.net English forums at PIC Vietnam - Vietnamese Electronics forums R&P Trading and Forwarding Co. Ltd. Distributor of Microchip in Vietnam

28th August 2004, 03:43 PM	(permalink)
infinity	I have come across an IR receiver-sensor TPOS 1738. But its range is 35m. But thats the one that is readily availabl here. Do u think it can work for a lower range by making some modifications?

28th August 2004, 11:14 PM	(permalink)
JFDuval	Hi! 35m is with a high current pulsed IR led from a tv selector. With reflexion, 35m is impossible. The distance is adjustable directly by the current passing trough your IR led. __________________ JFDuval jfduval --@-- aqra.ca http://www.aqra.ca

25th September 2004, 08:34 AM	(permalink)
infinity	TSOP 1738 I need help for using this IR Receiver TSOP 1738 as a range-finder.Will its sensitivity differ at different frequencies? Please suggest me some good website where I can find guidance.

25th September 2004, 11:22 AM	(permalink)
JFDuval	Hi! You can see one of my montages at machivi.ma.cx. Just flip the 2233 to a 1738 ans adjust the frequency of the 555. __________________ JFDuval jfduval --@-- aqra.ca http://www.aqra.ca

27th September 2004, 03:21 PM	(permalink)
infinity	Hi Your website is in a language, I cannot understand. Please tell me how to translate it in English. Also please specifically answer the question " Can TSOP 1738 be used as a rangefinder?"

27th September 2004, 04:27 PM	(permalink)
JFDuval	Hi! My website is in French. You can une Google to translate it. And yes it can be use for a rangefinder. __________________ JFDuval jfduval --@-- aqra.ca http://www.aqra.ca

29th September 2004, 06:37 AM	(permalink)
subhasis	hi, i am new here. i want to use ultrasonic sensors..... for obstacle detection. i have thought of using acroname's ...SRF08 for my work.... i want to use the data provided by the rangefinder, in a c++ program and use it in a path planning algorithim. can anybody help me regarding this.... i am giving a statement of the problem i am dealing, here... The problem is defined below... I have to mount the sensor in a Wheeled Mobile Robot. Given an initial and final posture of the vehicle, that the robot has to reach in an environment having unknown obstacles. The obstacles r randomly scattered n the vehicle has no prior knowledge of them. The vehicle has to sence the obstacles and their distance so that the distance data can be used to decide the path on the basis of that information. For this the distance measurement has to be done from a reasonable distance with good accuracy. The sensor will be mounted on a servo to loacate its angular orientation with respect to the reference orientation. This way, the vehicle will move on the basis of the sensor data till it reaches the destination point. I guess my usage of the meter is quite clear. So anyone, who has worked on a similar thing can please help me. I want a very accurate sonar, which could communicate with the computer through serial port. I want to use the data in a C++ program. So a good tutorial is also needed. Please also tell me, which method of distance measurement is more suitable. I do not want to use vision. If you have any specific technique, please let me know. Subhasis __________________ Irreverence and flippancy is essential to mantain sanity.

29th September 2004, 05:17 PM	(permalink)
infinity	Can you please further elaborate on how TSOP 1738 can be used as a rangefinder? Will its output change at different frequencies?Will its sensitivity change at different freuencies? Will it be able to detect obstacles at different distances at different frequencies?

29th September 2004, 05:22 PM	(permalink)
infinity	Check out this link http://www.roboticsindia.com/modules...article&sid=35 There is a graph of receiver sensitivity of TSOP1740 on it. The graph shows that receiver sensitivity varies with frequency. Can you give me more information related to this?