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I have always been fascinated by robots especially one with the wheels because they are cheap, easy and fun to make and play around with. Recently I came across a circuit in one of the books. It was a light sensitive led circuit based on 555 timer ic. I modified the circuit just a little to make a cheap light seeking robot. Let's see how i did it.

Step 1: Materials

To build the bot you will need the below mentioned components.
1. 2x 555 timer ics
2. 4x 10k resistors
3. 2x LDRs (Light Dependent Resistors)
4. A breadboard if necessary
5. Some wires
6. 2x motors (with wheels)
7. 2x 0.01n capacitor
8. 9v portable power supply

And you may also need a messy workbench.
<p>sir I want schematic diagram for making lfr using NE555.plzz help me.</p>
Schematic diagram is already attached to this instructable.
thank you sir.<br>
<p>sir this robot follows which coloured line dark (black) or bright (white)</p><p>and how to adjust sensitivity of LDR</p>
<p>You can read this. The circuit is similar.</p><p><a href="http://www.circuitdiagram.org/light-activated-relay-switch-using-555.html" rel="nofollow">http://www.circuitdiagram.org/light-activated-rela...</a></p>
<p>I am sure the answer to this is pretty simple since no one asked, but why is there a resistor instead of a capacitor? I have checked the astable mode circuit diagram and there is a C where the LDR is. I find that odd, shouldn't it be a Light Dependent Capacitor instead of a resistor (if such thing exists)?</p>
<p>HOW CAN I CONTROL THE SENSITIVITY OF THE LDR? WHERE SHOULD I USE POT?</p>
<p>You can use some resistor in parallel with the LDR. Try experimenting.</p>
<p>0121555555555</p>
<p>i am a new starter at the robotics and i am really confused between which capacitor to buy because there are a lot of capacitors with different voltage values so plz can anyone send me a link of required the capacitors for this project on ebay.you can mail me the link on the below given id</p><p>zenilmehta@gmail.com</p>
<p>Can you post a video of the robot in action? It would improve your I'ble and besides that, I' curious to see how it reacts to light... :-)</p>
Sorry! I have already used the parts in this robot to build others. I will try my best.
this was a very fun and educational project but I did it..thanks!
I am happy to know that you have completed the project!
<p>Hi, could u plz tell us how how did you get the values of the capacitors and why did you connect them in that why and plz show any calculations u did.</p><p>Thanks alot</p>
<p>There was not much math involved in this build as I used an existing circuit with some very little modifications. It was a light activated led circuit where in place of led I attached the motors. The motors that I used needed very little power. If not then I would have added a transistor. </p>
<p>thanks for your reply . </p><p>may i know why did you use 2 10k resistor. and is your 555 timer acting in an astable mode?</p>
Yes the chips are in astable mode to provide pwm for the motors.
Sir i am using a 12V dc motor at 300 rpm. Problem is that there is not enough torque to push the robot. Can i use a transistor(til31c) to amplify the voltage
Try using a lower power consuming motor. If you want to use a high power motor, check the datasheet of the transistor that you want before using it or simply use a motor driver.
<p>SIR, thanks a lot. Will you please give me a working PCB layout for me ?? I have done it for my midterm project, and For final term, it is required to implement the robot with pcb. thanks :)</p>
I never designed a PCB for this robot. It will take some time. I will try my best and contact you soon.
<p>Sir, have you done it? my project submission date is almost getting over :(</p>
When is the submission day? I am out of access to computers right now. Why don't you read some online sources and try till I can start designing?
<p>how to connect the battery.....pls tell asap</p>
<p>sorry ,can you explain it further?</p>
<p>thanks but problem solved but giving rise to new problem that the motors are making a very low noise.....but wheels not moving can this be an issue of battery cuz battery is 5v</p>
<p>how many volts does the motor need? be sure to check the value of components as well.</p>
<p>I have used the same values of component that you mentioned....</p>
<p>between 9-12 v.....and.....I tried a new battery too...but still motor sounds when I flash light but it doesn't move.....pls help</p>
<p>this is the motor am using but with gear</p>
<p>try attaching a 100 nano farads capacitor between the poles of the motor and I think 9 volts battery will be good for the motors</p>
<p>am using 0.01 micro farad .....should I switch to 0.1 micro farad</p>
<p>when you here that noise try twisting the motor manually no need of changing the capacitor.</p>
<p>I did try to twist the wheels...but still the wheels move by manual external force only and that too a little bit...</p>
<p>can you upload a photo of the circuit that you have made so that I can analyse it?</p>
<p>see..this...if need any more info am ready to give...but pls solve....it...thanks</p>
<p>First we need to figure out whether it's the problem of the motor or the circuit. Try repaying the motor with an led each. Attach a 150 ohms resistor to the led. If the circuit is fine the led should respond to light. Then try changing the motor.</p>
<p>ohk I will implement this......but I did one more thing ....that I used multimeter to measure voltage at motor while flashing light it only showed 0.12 v.....and I don't think that will help it run.....anyway....going ahead with your suggestion......and...implementing it.....will sent the result......thank you</p>
<p>From the photos you have uploaded, I think the resistors might have been not wired correctly. I might be wrong as photos don't focus just on the resistors. Try checking them and make sure all the components work. Connect one pole of the motor to pin 3 and other to the ground. </p>
Hey can you please recommend me a DC motor which doesn't draw a lot of current or the motor you used or any link.......cuz I when I replaced motor with led circuit worked fine....... Thanks in advance <br>
<p>Check <a href="http://robokits.co.in/shop/index.php?main_page=product_info&cPath=2&products_id=249" rel="nofollow">these</a>. These are the motors that I use. </p>
and capacitor you used is 0.01 uF or 0.01nF......will the robot work with either of these capacitors........thanks in advance
Hey can you please recommend me a DC motor which doesn't draw a lot of current or the motor you used or any link.......cuz I when I replaced motor with led circuit worked fine....... Thanks in advance <br>
Hey can you please recommend me a DC motor which doesn't draw a lot of current or the motor you used or any link.......cuz I when I replaced motor with led circuit worked fine....... Thanks in advance
Hey can you please recommend me a DC motor which doesn't draw a lot of current or the motor you used or any link.......cuz I when I replaced motor with led circuit worked fine....... Thanks in advance
Hey can you please recommend me a DC motor which doesn't draw a lot of current or the motor you used or any link.......cuz I when I replaced motor with led circuit worked fine....... Thanks in advance
hey my second ic heat up but i sused crct correctly......
<p>Great job.. I made it and works really good! :D</p>
<p>Good to know! great</p>

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