Author Topic: this in reference to the line follower made by pratheek (Read 2364 times)

nik@sdm · « **on:** December 25, 2011, 11:20:15 PM »

hi guys....
i just wanted to know .......
1)where the push buttons are connected .
2)what is the meaning of IC1 in the figure
3)there are 7 pins at the bottom of the board(just below the ATmeag16 IC),nothing is mentioned about them....so what must be connected to them!
link is http://www.societyofrobots.com/member_tutorials/book/export/html/350
I'll be really grateful to u... pls help me out of this situation.

billhowl · « **Reply #1 on:** December 26, 2011, 12:29:44 AM »

Quote from: nik@sdm on December 25, 2011, 11:20:15 PM

1)where the push buttons are connected .

PD2 (INT0)pin 16, PD3(INT1) pin 17 & PB2(INT2) pin 3

Quote from: nik@sdm on December 25, 2011, 11:20:15 PM

2)what is the meaning of IC1 in the figure

LM7805 - 5V Positive Regulator

Quote from: nik@sdm on December 25, 2011, 11:20:15 PM

3)there are 7 pins at the bottom of the board(just below the ATmeag16 IC),nothing is mentioned about them....so what must be connected to them!

Look at the photo, it connected to 2 resistors and preset resistor and link to pin 1 of the LCD connector may be for back lights control.

nik@sdm · « **Reply #2 on:** December 26, 2011, 02:59:00 AM »

to billhowl
sir....
1)got to know where to connect the push buttons... now,regarding the connections....the push buttons have 4 pins(the place of their connection has 4 female headers i.e., PD2,PD3,PB2 n GND).SO in order to connect 3 push buttons,is it that,we need to short one side pins of each of push buttons and connect them to PD2,PD3 n PB2 respectively.... and again short the other side pins of the push buttons and connect all of them to the GND?

2)sir,in the figure he has mentioned about the status LED n there r 3 pins for its connection.As far as my knowledge goes the LED has only 2 pins... so how to connect .

3)sir,at the left bottom corner of the figure, there r 3 pins in triangular fashion.... what we should connect there.

4)And finally SIR,u told to connect 2 resistors and a preset resistor(at the bottom 7 pins),if so...what r their values...n i have connected them in the following manner...
a)i have the PRESET resistor ....connected to the left 3 holes (which looks as a mirror image of L)
b)one resistor a have connected to other 2 holes (vertical) appearing just besides mirror imaged L
c)the other resistor is connected horizontally in the next 2 horizontally appearing holes.....

are the connections right..... if not pls tell me how to connect!

billhowl · « **Reply #3 on:** December 26, 2011, 08:14:37 AM »

1. Yes, one side of the switch connect each of the pins, the other side of the 3 switches short together and connect to Gnd.
2. The status LED is a bi-colored LED like this one in picture, so have three pins, you need to get common cathode.

for Q3 and Q4, I have attach a picture to show the connection, for the resistors values I give some guesstimate values, please check the datasheet of the LCD to see if a resistor is required.

nik@sdm · « **Reply #4 on:** December 26, 2011, 08:56:13 AM »

to billhowl......
thanks u sir for your guidance......it has helped me a lot!!

billhowl · « **Reply #5 on:** December 26, 2011, 09:01:07 AM »

You are most welcome

then click on the helpful button

nik@sdm · « **Reply #6 on:** December 26, 2011, 09:13:46 AM »

to billhowl,
sir...
please dont mind if I interrupt u in the future asking for help!!

THANKS ONCE AGAIN!

nik@sdm · « **Reply #7 on:** December 26, 2011, 12:23:48 PM »

to billhowl..
sir i had a query regarding LCD interfacing...
1)where the pin15(LED+) and pin16(LED-) of the LCD module should be connected.

2)where the pin3(contrast adjust) of the LCD module should be connected.

3)where the 1st pin of LCD connector (which is present on our main circuit) must be connected.

4)is the image below correct

billhowl · « **Reply #8 on:** December 26, 2011, 06:12:26 PM »

1) This is the backlight I refer to, connect pin 15 to pin 1 of LCD connector, pin 16 to GND.
2) pin 3 is to be connected to 10K ohms preset at the LCD power connector mid pin.
3) see ans 1)
4) yes, is correct.

nik@sdm · « **Reply #9 on:** December 28, 2011, 09:58:03 PM »

sir.... this is regarding sensor connections...

1) outputs from the sensor array, i have taken from, pin 8,7,1 n 14 of both the comparators(LM324) ,thereby constituting 8 outputs.

2) pin2,6,9,13 of both the comparators (LM324) are shorted.BUT nothing is connected to them.... is it that we need to connect something there?

3) two pins just below the comparator (i have highlighted them).... what must be connected there?

4)the preset (i have highlighted it) ... doesnt have all the 3 of it pins connected.

5) how to supply power to the sensor array?

nik@sdm · « **Reply #10 on:** December 28, 2011, 10:02:41 PM »

ALSO SIR, the figure below has more than 8 output wires taken from the sensor array...what r those wires and to where they are connected on the sensor array as well as on the main board?

billhowl · « **Reply #11 on:** December 29, 2011, 04:02:37 AM »

Quote from: nik@sdm on December 28, 2011, 09:58:03 PM

1) outputs from the sensor array, i have taken from, pin 8,7,1 n 14 of both the comparators(LM324) ,thereby constituting 8 outputs.

Correct

Quote from: nik@sdm on December 28, 2011, 09:58:03 PM

2) pin2,6,9,13 of both the comparators (LM324) are shorted.BUT nothing is connected to them.... is it that we need to connect something there?

Yes, both chips had to connected to the 20K ohms preset resistor mid pin.

Quote from: nik@sdm on December 28, 2011, 09:58:03 PM

3) two pins just below the comparator (i have highlighted them).... what must be connected there?

This two pins for supply +5V and Gnd to main board.

Quote from: nik@sdm on December 28, 2011, 09:58:03 PM

4)the preset (i have highlighted it) ... doesnt have all the 3 of it pins connected.

Connected to all the inverted input of the LM324

Quote from: nik@sdm on December 28, 2011, 09:58:03 PM

5) how to supply power to the sensor array?

two pins just below the comparator (you have highlighted them).

nik@sdm · « **Reply #12 on:** December 29, 2011, 09:28:29 AM »

sir....
in the below figure there are two set of wires....
1)from sensors,which are 8 in number
2)i think second set has 4 wires ..... where are they from?.... if we give Vcc n GND then there should be only 2 wires,right?

billhowl · « **Reply #13 on:** December 29, 2011, 10:54:42 AM »

The connector look like having only two wires. (brown and black)

nik@sdm · « **Reply #14 on:** December 29, 2011, 12:43:51 PM »

oh yes sir..... its quite confusing though!... thanks

nik@sdm · « **Reply #15 on:** December 29, 2011, 10:49:32 PM »

sir in power supply to sensors....
pin 4 is Vcc and pin 11 is GND,right?(4 n 11 are pins of LM324)

billhowl · « **Reply #16 on:** December 29, 2011, 11:53:44 PM »

Yes, correct.

nik@sdm · « **Reply #17 on:** February 04, 2012, 11:17:36 AM »

sir,
what must be the height between the sensors and the ground(track).?

billhowl · « **Reply #18 on:** February 04, 2012, 12:04:13 PM »

May be 3 to 5 mm.

nik@sdm · « **Reply #19 on:** February 05, 2012, 02:36:38 AM »

sir ,
in the figure...
1) u have connected a 33 ohm resistor.Isn't is too less?

2) whats the use of 100ohms preset mentioned in the diagram?

billhowl · « **Reply #20 on:** February 05, 2012, 05:07:12 PM »

Quote from: nik@sdm on February 05, 2012, 02:36:38 AM

1) u have connected a 33 ohm resistor.Isn't is too less?

2) whats the use of 100ohms preset mentioned in the diagram?

1) 33 ohm resistor was part of the voltage divider to control the Backlit of LCD, you may adjust the values.

2) preset use to control the Backlit of LCD

nik@sdm · « **Reply #21 on:** February 07, 2012, 04:39:29 AM »

sir....

1) 10k ohm preset is for the back light adjustment of LCD,isn't it?

2) whats the purpose of 100 ohm preset?

billhowl · « **Reply #22 on:** February 07, 2012, 07:00:49 AM »

Quote from: nik@sdm on February 07, 2012, 04:39:29 AM

sir....

1) 10k ohm preset is for the back light adjustment of LCD,isn't it?

2) whats the purpose of 100 ohm preset?

10k ohm preset is for lcd contrast adjustment and 100 ohm preset for the back light adjustment.

nik@sdm · « **Reply #23 on:** February 17, 2012, 09:35:56 AM »

sir,
i have built the board,
1) i'm getting 5v as the output of the 7805....but when i checked the voltage across the terminals(3 boxes highlighted) there is no voltage (0v)...

2) when i checked the continuity between pin 2 n 3 of the preset(in accordance with the diagram)... its shorted.Since pin 3 is GND and 2 is Vcc... i feel Vcc n GND itself r shorted .... n hence i'm not getting any voltage at those 3 boxes...?

how to sort this problem?

billhowl · « **Reply #24 on:** February 17, 2012, 04:43:31 PM »

You need to jumps a few wires to complete the circuits, 5V line is one of them.
Refer to the schematic.

nik@sdm · « **Reply #25 on:** February 18, 2012, 07:52:06 AM »

sir ,
i made all those connections .... n the circuit worked.... thank u sir.

1) but after some 5 minutes, the 100uf capacitor (indicated in the figure) exploded n was burnt.I was using a 12 volts,1.5mAh lead acid battery for the power supply....so what to do (shall i use any other kind of battery)?

2) since i had built the sensor array also ....i connected it to the main board.All the IR emitters were working fine.

3) i also connected the LCD display to the LCD power pins,but i didnt get any LCD back light.IS it that after programming, the LCD starts working? i haven't started programming the board yet.

billhowl · « **Reply #26 on:** February 20, 2012, 06:35:58 AM »

Quote from: nik@sdm on February 18, 2012, 07:52:06 AM

1) but after some 5 minutes, the 100uf capacitor (indicated in the figure) exploded n was burnt.I was using a 12 volts,1.5mAh lead acid battery for the power supply....so what to do (shall i use any other kind of battery)?

Not seen 1.5mAh lead acid battery. What voltage on the 100uf capacitor you use? it should be 16V or 25V

Quote from: nik@sdm on February 18, 2012, 07:52:06 AM

2) since i had built the sensor array also ....i connected it to the main board.All the IR emitters were working fine.

You can measure the out put of the LM324 using multi-meter to confirm the working of the sensor array.

Quote from: nik@sdm on February 18, 2012, 07:52:06 AM

3) i also connected the LCD display to the LCD power pins,but i didnt get any LCD back light.IS it that after programming, the LCD starts working? i haven't started programming the board yet.

Yes, LCD back light is control by the micro-controller pin, you need to program the micro-controller for it to work.

nik@sdm · « **Reply #27 on:** February 20, 2012, 06:42:56 AM »

i'll check out the capacitor ratings....
thank u sir.

trisuliswanto · « **Reply #28 on:** February 20, 2012, 06:50:15 AM »

please help me...
I just Successed build this robot by tutorial given by Pratheek and with a little modification, I add the push button on board and add a reset button, but now i dont know how can I get the right tuning configuration for my robot.
please give me an explanation how to perfectly configure the robot!

nik@sdm · « **Reply #29 on:** February 20, 2012, 08:20:42 AM »

to billhowl sir,

now i'm totally done with all the electronics as well as the mechanical stuff....

i need to start with the coding.... as of now, i don't really have a fair idea so as what to do n where to start from....
please tell me .. how should i start programming?

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Author Topic: this in reference to the line follower made by pratheek (Read 2364 times)

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