| Q: |
How do I troubleshoot USB connection of NXTCam with my PC? |
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| Ans: |
Have you installed the USB drivers?
Follow this link to download the drivers and installation instructions:
http://www.mindsensors.com/index.php?module=documents&JAS_DocumentManager_op=viewDocument&JAS_Document_id=44
If you have already installed drivers, and it still isn't recognizing, try this -
Run Control Panel -> System
Select 'Hardware' tab and click on 'Device Manager' button
Scroll down the list and expand 'Ports (COM & LPT)
Do you see any additional ports listed there?
Also look under 'Universal Serial Bus Controllers' node.
Do you see any additional serial devices? |
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| Q: |
What is the field of view of NXTCam-v4? |
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| Ans: |
The field of view is 43 degrees (approx).
To compute exact field of view -
Lens focal length: 3.6 mm.
Diagonal of CCD: 1/3 inches. |
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| Q: |
Can I transfer a bitmap of the current view from the NXTCam to the NXT brick? |
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| Ans: |
No, the image taken by NXTCam can not be transferred over to NXT. You can however transfer them to PC using USB. |
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| Q: |
The NTXCAM work only with NXT controler or its possible connect them to another one?? |
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| Ans: |
It is possible to connect NXTCam to any controller that has I2C pins. |
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| Q: |
While using NXTCam-v3 on my PC, I get 'time out' error. |
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| Ans: |
NXTCam-v3 AVR firmware may be corrupted.
As a feature of NXTCam-v3, the firmware is designed to be re-writable, but sometimes due to unknown reason it writes itself and corrupts.
The firmware needs be re-written by following procedure in section 'How to change Firmware of AVR Mega 8 processor' of 'Advanced Programming Guide'
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| Q: |
Is NXTCam able to measure the distance to the object? |
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| Ans: |
Not directly or accurately, but it is possible to get idea of the distance of the object from NXTCam by analyzing the size of the object tracked.
Please look at this related video: http://www.youtube.com/watch?v=4Yaj6WA9tBk
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| Q: |
Can the NXTCam-v4 detect range or just object existence? |
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| Ans: |
Please review this
NXTCam-Application Notes document |
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| Q: |
Can the NXTcam firwmare be programmed by usb to implement on the chip some new vision AI ? |
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| Ans: |
NXTCam-v3 firmware can be programmed via USB.
Review Advanced Programming Guide for further information. |
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| Q: |
When NXTCam is connected to my PC on USB, why does my NXT program not work? |
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| Ans: |
NXTCam vision engine communicates with PC using USB, and with NXT using I2C, but it can not do it simultaneously. So, when PC is connected on USB, it gives priority to USB communication over I2C. |
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| Q: |
I see that the mini USB cables come in 4 or 5 wire versions. Which do I need? |
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| Ans: |
You will need a '5 wire' cable. Generally the USB cable that comes with a digital camera will work. |
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| Q: |
Is NXTCam able to recognize different shapes or just colors? |
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| Ans: |
NXTCam can only detect colors (no shapes yet). |
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| Q: |
Can I use NXTCam on Linux? |
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| Ans: |
Yes, NXTCam-v3 or higher can be used on Linux directly. |
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| Q: |
What is the range of NXTCam? (distance in front) |
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| Ans: |
The range in front depends on characteristics of object you need to detect, if you are detecting a candle or flashlight like bright object, it can be 10 to 20 meters, but if it's a dull object it would be lesser.
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| Q: |
It looks like the colors uploaded to NXTCam are stored in a flash memory and retained even when powered down. Is that the case? |
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| Ans: |
Yes, the colors are retained through power cycles. |
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| Q: |
What is fps? |
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| Ans: |
fps means Frames Per Second.
NXTCam is scanning at about 30 fps. |
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| Q: |
How do I change the I2C address of a sensor? |
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| Ans: |
Use the executables at following URL to change the address.
(Use LEGO firmware 1.29 or higher for this, and follow instructions to install.)
http://www.mindsensors.com/index.php?module=documents&JAS_DocumentManager_op=viewDocument&JAS_Document_id=91
upon installation, attach sensor to port 1, run the program and follow on screen instructions. |
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