line follower

Yes, the four sets of eight pins in the micro-controller board picture represent the different ports - P0, P1, P2 and P3. There physical arrangement can vary from one board to another, as it depends on the manufacturer of the micro-controller board.

Both the circuits are same the only difference being that in practice we usually make connections on the back side of the board. Thats why it appears to be different than the schematic circuit diagram.

I am referring to PIN DESCRIPTION OF 8051  circuit diagram. (http://www.botskool.com/images/elec/ioi85.jpg)
and the microcontroller board picture (http://www.botskool.com/images/elec/ioi86.jpg)

See this comment - http://www.botskool.com/forum/electronics/sensors-and-communication/line-follower-ir-sensors#comment-1591 

Hey bharatgarg,

By lined pin sets, I guess you mean some pins are grouped together (enclosed inside a rectangle). Yes it has been done so to show that they collectively form different ports of the micro-controller.

To which circuit diagram are you referring?

http://www.botskool.com/tutorials/electronics/8051/input-output-instruct...

the image of microcontroller board shown in it has some of the pins lined together and 2-3 pins at some gap.

do these lined pin sets show P(0,1,2,3)? ASKING THIS BCOZ CIRCUIT DIAGRAM SHOWS A DIFFERENT CONFIGURATION.

I am totally new in field of robotics.

I am trying to make a line follower. I saw the circuit diagram shown in tutorials but not able to assemble the parts.

someone kindly upload or give link of photos/vedios of assembled components.

Hi royrude,

sorry for the late reply

Kindly check the power and current requirements of LM324 and ensure that the power supply is sufficient enough to deliver optimum power to the LM324 as well. Otherwise it may also happen because of over-loading.

In case of over loading (where current flows through lower resistance side), we isolate these circuit components by using very high resistance. I think I have discussed on overloading in my earlier posts. Read more on it and hopefully you can get 4.7-4.9 Volt output.

Best of luck.

 I am having some problems with my OP-AMP (LM-324N).There is around a 1.23 V drop from voltage applied to the Vcc. I can't understand the problem. With Vcc=5V , output is coming around 3.7 V.And if one of the outputs is high, all other outputs also go high, Please tell me the problem.  

 yes criminals are cylindrical models made of cardboard and are coloured red.

Hi Neha,

These criminals/objects that you want to detect, do they have a unique or common property?