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marcus02
Joined: 22 Jan 2013
Posts: 7
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 Posted: Thu Feb 07, 2013 9:22 am |
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| Gabriel wrote: | Like i said:
| Quote: | | Maxbotics has an application note for multiple sensor operation on their site |
I just checked their website again... they even have code samples...
good thing is that the sensors are built using PICs so the code should be ease to port to CCS...
G |
1 sensor has no issue on that.. but currently i am trying to use 2 sensors by using 1 PIC... Maybe thats the cause for the problem. Both are analogue somemore. |
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asmboy
Joined: 20 Nov 2007
Posts: 2128
Location: albany ny
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| Posted: Thu Feb 07, 2013 12:46 pm |
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| Quote: |
unstable with the long range.
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With this particular design , you must EXPECT that the reading to reading
error / ambiguity will increase (dramatically) with distance. There are several good physics reasons for this including:
* beam spread /multipath response
* very poor diode "limiting" circuit in receiver section
* path loss
* 10 bit resolution making all of the above worse.
* increasing incidental in-band environmental "chirpy" trash pickup as distance increases and source return fades
it is going to be at its best accuracy, close up, with hard reflecting surfaces, in an otherwise short wave length, sound absorptive environment.
don't expect too much repeatability from reading to reading, as
target distance increases. you will be disappointed if U do
This is a very cheap , and IMHO, sloppy piece of ranging hardware. |
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MaxBotix Inc
Joined: 08 Feb 2013
Posts: 1
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| Posted: Fri Feb 08, 2013 11:48 am |
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Hello! This is Tom Bonar from MaxBotix Inc.
I saw your forum post, and I want to offer help regarding the use of our MB1010 ultrasonic sensor.
@marcus02
I saw that you stated: But i have no idea on how to turn the one i am not using 'off'.
The sensors have an RX pin that can be used to command the sensor to range. If you view this article there is information on commanding the range cycle of the sensor. If you wish to have the sensor range every 3 minutes instead of free-run the RX pin needs to be used to do so. When the RX pin of our sensors is held to a ground, the sensor will remain in a "standby" mode until it is brought high (Vcc level) for a length of time greater than 20uS.
I also saw that Ttelmah had stated information on turning one of the sensors "off" so only one sensor is ranging at a time. This can be done by chaining the sensors together. When the sensors are chained, only one sensor ranges at a time and this will eliminate cross talk between sensors. Information can be found from this link. This is always recommended when operating multiple sensors in the same environment.
The last question I saw while reading your forum post was "It can only works perfectly within the range of 50cm instead of 6meters. " What type of object do you wish to report the range to? With the use of ultrasonic sensors, some targets such as walls can be seen a long distance because they reflect more ultrasonic sound then objects such as people. The MB1010 will report the range to a wall at 6 meters if the wall is perpendicular to the sensor. If the wall is not perpendicular the sensor may not report the range to the wall. Ultrasonic sensors act similarly to a principal of a flashlight and a mirror. If you shine a flashlight into a mirror that isn't facing you, the light will reflect away from the source.
Please let me know if you have any questions. We are hear to support you.
Best regards,
Tom Bonar
Technical Support
of MaxBotix Inc.
Phone: (218) 454-0766
Fax: (218) 454-0768
Email: [email protected]
Web: www.maxbotix.com
Follow us on Facebook at: http://www.facebook.com/pages/MaxBotix-Inc/125159384204938
Technical support and sales are subject to
the terms and conditions listed on our
website at http://www.maxbotix.com/ MaxBotix,
MaxSonar,EZ0, EZ1, EZ2, EZ3, EZ4, AE0, AE1,
AE2, AE3, AE4, WR1, WRA1, and WRLA1 are
trademarks of MaxBotix Inc. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19544
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| Posted: Fri Feb 08, 2013 12:14 pm |
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Thank you.
Nice to have some stuff "from the horse's mouth". Always appreciated.
Best Wishes |
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marcus02
Joined: 22 Jan 2013
Posts: 7
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| Posted: Fri Feb 08, 2013 8:12 pm |
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| MaxBotix Inc wrote: | Hello! This is Tom Bonar from MaxBotix Inc.
I saw your forum post, and I want to offer help regarding the use of our MB1010 ultrasonic sensor.
@marcus02
I saw that you stated: But i have no idea on how to turn the one i am not using 'off'.
The sensors have an RX pin that can be used to command the sensor to range. If you view this article there is information on commanding the range cycle of the sensor. If you wish to have the sensor range every 3 minutes instead of free-run the RX pin needs to be used to do so. When the RX pin of our sensors is held to a ground, the sensor will remain in a "standby" mode until it is brought high (Vcc level) for a length of time greater than 20uS.
I also saw that Ttelmah had stated information on turning one of the sensors "off" so only one sensor is ranging at a time. This can be done by chaining the sensors together. When the sensors are chained, only one sensor ranges at a time and this will eliminate cross talk between sensors. Information can be found from this link. This is always recommended when operating multiple sensors in the same environment.
The last question I saw while reading your forum post was "It can only works perfectly within the range of 50cm instead of 6meters. " What type of object do you wish to report the range to? With the use of ultrasonic sensors, some targets such as walls can be seen a long distance because they reflect more ultrasonic sound then objects such as people. The MB1010 will report the range to a wall at 6 meters if the wall is perpendicular to the sensor. If the wall is not perpendicular the sensor may not report the range to the wall. Ultrasonic sensors act similarly to a principal of a flashlight and a mirror. If you shine a flashlight into a mirror that isn't facing you, the light will reflect away from the source.
Please let me know if you have any questions. We are hear to support you.
Best regards,
Tom Bonar
Technical Support
of MaxBotix Inc.
Phone: (218) 454-0766
Fax: (218) 454-0768
Email: [email protected]
Web: www.maxbotix.com
Follow us on Facebook at: http://www.facebook.com/pages/MaxBotix-Inc/125159384204938
Technical support and sales are subject to
the terms and conditions listed on our
website at http://www.maxbotix.com/ MaxBotix,
MaxSonar,EZ0, EZ1, EZ2, EZ3, EZ4, AE0, AE1,
AE2, AE3, AE4, WR1, WRA1, and WRLA1 are
trademarks of MaxBotix Inc. |
Thanks for your big help. Appreciated.
Will ask again if I don't understand.
Regards,
marcus |
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