BS2..QTI sensors and Infrared headlights

ur5pointos2slo

I was wondering if anyone knew of a way to use the QTI line sensors and the infrared headlights at the same time. I cannot figure a way to hook them both up due to lack of room. Basically I need to make the bot follow a line and when the infrared detects the wall it will stop, do what it needs to do, do a 180 and repeat the process. Any help would be appreciated. Thanks

Franklin

Are you talking of lack of room on the bot or in code? You may have to make a bracket if you are talking physical room and you need to attach your code if that is your problem.

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- Stephen

ur5pointos2slo

Yes I am referring to lack of physical room sorry for the confusion. I have the ir headlights hooked to the board, but cant think of any ways to actually hook the qti sensors up as well. This is an educational bot btw.

MSDTech

Normally you mount the QTI sensors under the bot. If you are running out of pins, you might look at the faster routie in:
http://www.parallax.com/Portals/0/Downloads/docs/prod/robo/FasterQtiSubroutineV1.1.pdf
It only requires 4 pins for 4 sensors instead of the 6 pins used in the three sensor setup.

ur5pointos2slo

MSDTech said...
Normally you mount the QTI sensors under the bot. If you are running out of pins, you might look at the faster routie in:
http://www.parallax.com/Portals/0/Downloads/docs/prod/robo/FasterQtiSubroutineV1.1.pdf
It only requires 4 pins for 4 sensors instead of the 6 pins used in the three sensor setup.

Yes I did mount the sensors under the bot. I was only doing the 3 sensor setup I will take a look into the 4.

ur5pointos2slo

Ok I took a look at the 4 sensor setup. Is there any way I could possibly move all the components down the board to lets say with the blue wires in p0-p3? If so how would I need to modify the basic stamp code to make the sensors work on this part of the breadboard? I have no experience with these bots or programming sorry if I am making this difficult.

Post Edited (ur5pointos2slo) : 11/6/2008 1:30:06 PM GMT

MSDTech

If you look at the code, you will note it uses the predefined variables DIRB and INB these are a way of working with pins 4 through 7 as a unit. Pins 0 through 3 can be addressed as a similar unit DIRA and INA. Likewise, Pins 8 to 11 are INC and 12 to 15 are IND.

ur5pointos2slo

MSDTech said...
If you look at the code, you will note it uses the predefined variables DIRB and INB these are a way of working with pins 4 through 7 as a unit. Pins 0 through 3 can be addressed as a similar unit DIRA and INA. Likewise, Pins 8 to 11 are INC and 12 to 15 are IND.

Thank you that makes sense. I had tried to hook it up previously using pins 0 to 3 with the same code and couldnt figure out what I needed to change. I will try that and hopefully be able to use both infrared and qti sensors now.

ur5pointos2slo

Ok I got the qti sensors to work properly. Now my problem is taking the infrared headlight setup and moving it up the board so I can use the qti sensors and the headlights simultaneously. When looking at the diagram for the ir headlights in the·"robotics with·boe-bot·book" page 239.·I was thinking I could possibly just use p8 and p9 instead of p0 and p2 and then use p14,p15 instead of p8,p9 I do not know if this is possible if anyone has any solutions please let me know. Thanks

MSDTech

It doesn't matter which pins you use - just remember to adjust the code. This is why the texts recommend you use a name for the component connection. I always have one section that lists all the pins and gives them symbolic names. That way if I have to rearrange the connections, I only need to change one line of code.
A good description is in the Editor help file under the "Elements of PBASIC Style".

Post Edited (MSDTech) : 11/7/2008 3:05:48 AM GMT