Picture of Light seeking robot ATLAS_15
Hey guys this is my first instructable,in wich i'll teach you how to make a light seeking robot.This is a project i've made ,because i like robotics, and i'm starting with it, so it's a simple way to build a robot.I've made it with very cheap materials, but if you want you can make it better ,i'm planning to make a radiocontrolled one , but i dont know anything about it .
Let's get started !!!....
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Step 1: Part List and Materials

Picture of Part List and Materials
For this instructable you'll need :

2 Plastic circles , i used  circles but you can use any shape 

3 big screws and bolts 

Hot glue  and hot glue gun

Cables (1,5 meters aprox.)

2 Dvd 5.9 Volts Motors

2 TIP120 Transistor

2 1k Resistors 

2 1N4001 Diodes

2 LDRs

1 breadboard (optional , i didn't use it ,but it make a more structured project)

2 Wheels ( i got them from an old toy )

1 Switch 

To power up this project i'll be using a 9 volt battery , but you can also use a A23 12 volt battery or any other similar power source ,you'll also need sodering tools such a sodering iron stanium , helping hands ,etc.


Step 2: Circuit and internal structure

Picture of Circuit and internal structure
This is the diagram of the circuit i used . be carefull off the polarity of the motors and the position of the LDRs , because that defines the moves that the robot does .Before you proced to the next step , make sure that the motors spin in a correct way .There are no sodering instructions less than these , so you are free to make it in your way!!

Step 3: Creating the body

Picture of Creating the body
To make the body i used 2 old plastic circles , and i attached it with screws and bolts as  it's show down there , but you can make the body you want , you could also use and od tupper .
yhdesai2 years ago
can i use any other npn transistor?
159753 (author)  yhdesai1 year ago
yes you can use another npn transistor do the math for the other two resistor
yhdesai2 years ago
please reply fast
yhdesai2 years ago
in the first photo whatare the blue ones (near ldr)
diymaker=)3 years ago
(removed by author or community request)
159753 (author)  diymaker=)2 years ago
first of all i can tell you what it could go wrong with the proyect : first you have to use an NPN transistor , second the intensity in the colector pin of the transistor should be 10 times higher than the intensity in the base pin of the transistor. If all is good at this point, you should probably hafe to chenge the LDR's , I used two 2Kohms ones.Finally if nothing else works you can verify if the motors are working good , or if the baterry has enough power.
I have some couple TIP30C . would they work?
Hello? Anyone?

159753 (author)  Michael_Bell2 years ago
Sorry i didn;t logged in for a while .. The answer is no the TIP30C is a PNP transistor , you have to use an NPN transistor like the TIP 120 ,TIP121 or the TIP122 .Hope this information was usefull for you ,here i leve you the datasheets of the TIP30C and TIP120 :
Weiq2 years ago
may i have the circuit diagram ?
i can't understand you circuit diagram.
I was also asking if i could get the schematic diagram of this robot with SPDT switch and on/off switch please thanks!
159753 (author) 3 years ago
hi ajinkyadixit the SPDT switch it's drawn on the schematic, i''l tag it for you ;)
thanx a lot 159753......for da tag
this ckt is betr n easy dan mine..
i ll try it... bt TIP120 is easily available at here??? or suggest smthing els option
like npn or pnp.. :)
159753 (author)  ajinkyadixit3 years ago
your welcome ! please vot this instrctable in the shopbot, make it glow and science fair contests ;)
madbot19993 years ago
hi 159753, mine didn´t work becouse the LDRs were not sensible enaugh.
where did you buy yours?
hi guy.....these is very nice robot
but u have not shown the use of SPDT switch in the schematic.....pls give it