QTI sensing at a higher distance from the ground
I realize that this question has been asked before, but how can I possibly program the QTI sensors to read from higher off the ground?
My school project actually requires us to follow a track that is like a baseball diamond, with black lines and white foam for the bases.
The problem is that the foam bases are half an inch high, and the boe-bot is required to drive over each of the bases. For this reason, the lowest point on the boe-bot must be slightly higher than 1/2 an inch.
Yes, I have gone through the entire "Robotics With the Boe-Bot tutorial."
I do understand that the having the QTI sensors work at this range reduces their accuracy, and I am aware that light sources may or will interfere with the sensors.
However, I still want to attempt to program the sensors to do this, unless of course you have a better option.
Is this impossible? If not, how can it be done? Any other suggestions?
Thanks
My school project actually requires us to follow a track that is like a baseball diamond, with black lines and white foam for the bases.
The problem is that the foam bases are half an inch high, and the boe-bot is required to drive over each of the bases. For this reason, the lowest point on the boe-bot must be slightly higher than 1/2 an inch.
Yes, I have gone through the entire "Robotics With the Boe-Bot tutorial."
I do understand that the having the QTI sensors work at this range reduces their accuracy, and I am aware that light sources may or will interfere with the sensors.
However, I still want to attempt to program the sensors to do this, unless of course you have a better option.
Is this impossible? If not, how can it be done? Any other suggestions?
Thanks
Comments
I will add that the QTI sensor from Parallax is actually a few external components along with the actual QTI chip -- which is a combination IR emitter and detector. I bring this up because the little QTI board from Parallax has the resistor that limits the IR emitter output -- so it can't be changed without soldering (and voiding your warranty) if you need to increase the IR emitter's output. That said, the value on the board is generally OK up to nearly .7" (in my experiments, anyway), though reading the difference between white and gray becomes problematic (white/black or black/cliff is still not a problem at that distance).
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When the going gets weird, the weird turn pro. -- HST
1uffakind.com/robots/povBitMapBuilder.php
1uffakind.com/robots/resistorLadder.php
Just a thought.
Dave
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Dave Andreae
Parallax Tech Support·