Rc Car V2.0


Introduction: Rc Car V2.0

About: hello there I'm an engineering student in instrumentation and control and like making simple electronics projects

Hi guys

this is my second instructable and is based on the first which u can find here-link,

the first one was a bit raw and this one is a bit refined.


The wire hassle has been eliminated to a great extent.

better looking and more powerful four wheel drive.

circuit for car and remote designed in eagle which are attached in this instructable.

and....i don't know, there may be some more i leave it to you to find them out :).


copper clad board,acetone,sand paper,pcb drill,0.8mm and 1mm drill bits,some female jumper wires (red and black will be better),16 gauge wire,soldering rod ,soldering flux and soldering wire.

For the car you will need:

1.car chassis

2.4 geared dc motors

3. 4x 1000uf capacitors

4. ic ht12d

5.ic l293d (l293ne is preferred)

6.315mhz receiver

7.wheels for motors

8. 1x 51k ohm resistor for ht12d oscillator pins

9. LM7805

10. 2x 1N4007 diodes.

11.12v battery.

12. leds-white,blue and red or as you wise them to be, resistors-1k,51k,16pin and 18pin ic base, female burg strips,double tape,some nuts and bolts to get the chassis together.

for remote:

1. 2x dpdt switches.

2. ic ht12e.

3.315mhz transmitter.

4. 1x megaohm resistor for transmitter oscillator pins.

5. 1x red led and 1k resistor.

6. 3v coin cell x2(cr2032) and their holder.

7. two resistance with series resistance approx. 1meg.

7. female burg strips,18 pin ic base.


we will be using-


its a decoder ic and placed on car.


Its a encoder ic and placed on remote.



its a very well known motor driver ic used to run motors through a separate power supply when it gets a signal from a microcontroller i.e a 5v control signal on its input pins.i recommend using L293NE because of its higher current rating of around 1A in contrast to 0.6A offered by L293D.


again a well known ic ,its a linear voltage regulator which regulates input voltage to 5v at its output.

much on the above 3 ic's in my previous instructable-link,and i'm assuming you are well versed with using 7805.


The circuits were designed in cadsoft eagle ,i'm new to this software so if someone can give me some useful tips it will be appreciated:).

other thing is that we will be having a single layer copper board and some connection would be tough on the same layer so i used 16 gauge copper wires on top too to make connections.

schematic and board files of both car and remote have been uploaded in case u want to make some changes of your own. and for direct printing the pcb i have also uploaded the pdf file just open it up and print it on a glossy paper.there are many good text available on internet explaining pcb printing and getting it on the copper board so im not going into it.

one advice i will give is that first get the copper side of the board done and drill holes in it after that it will be easy to place the top print over the board with the holes helping to align the top side print with the bottom.

Step 4: Getting the Pcb Done.

1.cut the board to dimensions and then iron the print on copper side for few minutes,soak in water till its easy to remove paper.

2.fix the broken lines using a permanent marker.

3.now your pcbs are ready for a fecl2 bath(other chemicals are also available for etching process).

4.get rid of the ink from board to reveal the shiny copper tracks.

5.drill holes and now get ready to place the top print over the top of the board, use the holes you made to align the print and iron it to.

6.again soak in water to remove the paper.

7.now you are ready to solder your components.



1.twist the motor wires and place a 0.1uf ceramic capacitor at their terminals this is done to minimize rf noise caused by them.

2.diodes were used to get the effect of using two power supplies from one battery,this is done to prevent circuitry from current spikes generated by motors.

3.a toggle switch is used in car to turn on/off the headlights.

4.cut the female jumpers into two and connect the wire end to battery and jumper head to pcb for supply.



1.use an antenna to improve reception.

2.use any power supply you wish but greater than or equal to 5v.

3.initially i had in mind of using dip switch for address matching so you will see it in the remote but later i dropped this idea because of space restriction on car pcb.

Step 7: Finally

finally this is about it,

if you have any queries please post them i will try helping you out,and do watch the video of car in action :).



    • Oil Contest

      Oil Contest
    • Creative Misuse Contest

      Creative Misuse Contest
    • Water Contest

      Water Contest

    29 Discussions

    HI there,
    I've made a car, the problem i am facing that when i just press a button, the motor starts rotating and it keeps rotating though i released the switch.
    plss rply fast..........

    Hello Abhishek, your project is very good and appreciable, you can do many in your life. I want to talk to you about this project personally. If you agree, send me an email to sharsh335@gmail.com .

    good day. what can i use as an alternative for ht12d and ht12e? at least for multisim schematics. thanks

    1 reply

    hi there ,
    PT2272 as the decoder and PT2262 as encoder can be used to serve the same purpose.


    2 years ago

    I did not understand the circuit of this rc car as your first rc car. Please send me the pic of this rc car circuit as your first car circuit pic.

    What are the Values of resistances for 9v battery, pls?

    1 reply

    use the same resistance values as mentioned here.

    Hi there! Does the voltage rating of the DC motors have to match that of the power supply? I'm assuming so, but I just wanted to check.

    1 reply

    yes the battery rating must be atleast the minimum rating of the motor you using...there's no need for them to match.

    Hi there! I'm very new to electronics so this may seem a stupid question to ask, but what do I have to change in the layout to make the back wheels move forward and backwards, while the front wheels only turn left and right?

    2 replies

    hi there
    we have only four signals which are being encoded and decoded by the ICs (ht12d and ht12e) and these are used up to drive the two motors through l293d (I have wired two motors to work as one together) so if u want to operate it the way u mentioned u need atleast 2 more signals that means more hardware and ultimately the whole pcb design needs to be changed.

    I think I got it, isnt there a signal telling the motors to run backwards and another to run forward? if im correct, I only need to instead of splitting the signals between tow sides, split the between traction, 1 motor on the back wheels, and direction, one motor tilting the front wheels. I don't know if I explained it right but as soon as I can I will upload a sketch of the idea, not the PCB, the car structure itself. thanks for the answer.

    as they call the controls you use

    I can only find 315 mhz transmitters with 3 pins. Will this still work?

    1 reply

    hi there ,
    yes u can if the pins are -Vcc ,ground ,data .

    Hy Abhisk i wanna knw that is there in problem in using RF Transmitter & Receiver - 433 MHz (ASK)
    perhaps of that u preferd

    1 reply

    Hi there ,
    u can definitely go for 433MHz one ,there was no big reason for choosing 315MHz just that it was a bit cheaper and offers more range in open area compared to 433MHz as I found on the web.

    I like it this way too but yes if you come up with something new then do share it here ...