hai im new to this electrotech - Electronic Circuits Projects Diagrams Free

cb_maha · 9th September 2009, 05:01 PM

hai... im doing project on line tracking robot.. im using LM324 for sensing circuit. im using ordinary LED and LDR.. will it help me...???? or i shuld go for IR LED's....????

gaspode42 · 9th September 2009, 05:21 PM

Hi

Welcome to the forum.
I personally can not help you with this one - but I am sure there are those here who can.
Enjoy your stay!

birdman0_o · 9th September 2009, 06:25 PM

Depends on the colour of the lines!
You are better off with IR and an IR detector if the line colour is black/white.

cb_maha · 10th September 2009, 03:49 PM

thank you friend.... the color of line is black/white only... LM324 works properly but when connected with ldr and led,,,, the Ldr is not detecting the light from Led though it is placed nearer(2cm) .... ok i wish to try with IR sensors... thank u

birdman0_o · 10th September 2009, 04:47 PM

You do realize that the LDR will not detect light when it is a black line right?

cb_maha · 14th September 2009, 04:33 PM

I found that the problem is on LDR only.... it is not capable to absorb light from normal LED... what can I do now...? Is it advisiable to try with other color LEDs??? Will LDR responds to IR led..????.

birdman0_o · 14th September 2009, 05:51 PM

It is capable however it will work VERY slowly, use an IR photodiode and an IR led!

ElectroNerdy · 14th September 2009, 06:20 PM

I would use a CdS cell (also known as a photocell). A circuit like this can be very simple, and I've heard it has been done before. Any color that is dark, such as a black line, will increase the resistance of the CdS cell. Anycolor that is light will decrease the resistance. You should be able to find a circuit that wil let you adjust the sensitivity of your CdS cell for a certain color. Search for something like this.

butyokz · 15th September 2009, 08:52 AM

oh welcome here... but sorry brother I do not have an Idea yet of that project..

Mr CCE · 15th September 2009, 09:04 AM

I've tried that project but i didn't construct a complete model.
however I finished the light detection bit, and the best light detector that can be used in this case is a photo transistor.

hey im new too!!

cb_maha · 16th September 2009, 02:59 PM

thank u... i'm going to try with IR led's

cb_maha · 16th September 2009, 03:00 PM

Welcome u Mr CCE....

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9th September 2009, 05:01 PM	#1
cb_maha	hai im new to this electrotech hai... im doing project on line tracking robot.. im using LM324 for sensing circuit. im using ordinary LED and LDR.. will it help me...???? or i shuld go for IR LED's....????

9th September 2009, 05:21 PM	#2
gaspode42	Hi Welcome to the forum. I personally can not help you with this one - but I am sure there are those here who can. Enjoy your stay! __________________ "A lie gets halfway around the world before the truth has a chance to get its pants on" - Sir Winston Churchill (1874 - 1965)

9th September 2009, 06:25 PM	#3
birdman0_o	Depends on the colour of the lines! You are better off with IR and an IR detector if the line colour is black/white. __________________ Mike My website: www.ElectroBird.net

10th September 2009, 03:49 PM	#4
cb_maha	thank you friend.... the color of line is black/white only... LM324 works properly but when connected with ldr and led,,,, the Ldr is not detecting the light from Led though it is placed nearer(2cm) .... ok i wish to try with IR sensors... thank u

10th September 2009, 04:47 PM	#5
birdman0_o	You do realize that the LDR will not detect light when it is a black line right? __________________ Mike My website: www.ElectroBird.net

14th September 2009, 04:33 PM	#6
cb_maha	Thank u birdman I found that the problem is on LDR only.... it is not capable to absorb light from normal LED... what can I do now...? Is it advisiable to try with other color LEDs??? Will LDR responds to IR led..????.

14th September 2009, 05:51 PM	#7
birdman0_o	It is capable however it will work VERY slowly, use an IR photodiode and an IR led! __________________ Mike My website: www.ElectroBird.net

14th September 2009, 06:20 PM	#8
ElectroNerdy	I would use a CdS cell (also known as a photocell). A circuit like this can be very simple, and I've heard it has been done before. Any color that is dark, such as a black line, will increase the resistance of the CdS cell. Anycolor that is light will decrease the resistance. You should be able to find a circuit that wil let you adjust the sensitivity of your CdS cell for a certain color. Search for something like this.

15th September 2009, 08:52 AM	#9
butyokz	oh welcome here... but sorry brother I do not have an Idea yet of that project..

15th September 2009, 09:04 AM	#10
Mr CCE	I've tried that project but i didn't construct a complete model. however I finished the light detection bit, and the best light detector that can be used in this case is a photo transistor. hey im new too!!

16th September 2009, 03:00 PM	#12
cb_maha	Welcome u Mr CCE.... Last edited by cb_maha; 16th September 2009 at 03:01 PM.

16th September 2009, 02:59 PM	#11
cb_maha	thank u... i'm going to try with IR led's