QTI

nihal

Hi

I have problem in QTI Line Following,i use boe-bot and BS2,i use pins 12,13,14,15

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but my test code does't work..........

QTI TEST (2).bs2



waiting for reply

nihal

Mike Green

Have you tried the test code in the QTI sensor documentation? The QTI sensor is really an analog sensor and your test code doesn't take that into account. Also, keep in mind that the 3 wire connection to the sensor is different from most other sensors. The white wire goes to +5V and the red wire goes to the Stamp I/O pin. As noted in the documentation, normally the +5V supply is provided by another I/O pin. This is done so that only one QTI sensor's light source is on at a time. Otherwise, you might get light spillover from one sensor to another.

nihal

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Thanks mr:mike green for reply

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but my problem is ......the documentation use pin 4,5,6,7 when i change other pin like 12,13,14,15the sensor don't work
"i mean that the sensor work just on the pins used in documentation"


.....................My attachment code is the same code in documentation............
but just change the OUTB,DIRB,INB to OUTD,DIRD,IND

Mike Green

We were looking at different documentation. This is the documentation for the QTI sensor itself which I was referring to. You were using the AppKit with its sample code. I see what you mean about changing OUT/DIR/IN B to D. Remember that I/O pins 12-15 are also connected to the servo sockets. If you have anything plugged in there, that will conflict with your use of them with the QTI sensors. Make sure you have your wiring correct. There is no fundamental reason why using I/O pins 12-15 should be any different from using I/O pins 4-7 as long as you're not using the servo sockets.

nihal

I am trying agin now it working when i pulg sensors directly in the board of Education not in X4 and X5 sockets which is also pin12-15 .............i don't know why??

X4 and X5 Sockets is number 5 in the attached image

Mike Green

The connections for the QTI sensors are different than the connections in the X4 and X5 sockets. In the X4 and X5 sockets, the red (R) wire is +5V (or Vin), the black wire (B) is Vss, and the white wire (W) is the I/O pin. This is the same as servo motors and things like the PING sensor, but the QTI sensor is different. That's why the documentation always shows QTI connections made using the breadboard area.