this is my first instructable so please bear with me guys :)

I loved playing with rc cars when i was small so i thought of making one now when i have some knowledge of it.

moreover i faced some problems while making it and tried to solve those problems via different sources across the net.

thought of uploading it as it may help someone facing the same problems...


Gathering material

For the car you will need:

1.car chassis

2.caster wheel

3.two geared dc motors

4. 2x 1000uf capacitors(the more the capacitance the better it is)

5. ic ht12d

6.ic l293d

7.315mhz receiver

8.wheels for motors

9. pcb

10. 1x 51k ohm resistor for ht12d oscillator pins

11. 3x white leds, 2x 1k resistors, 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. battery connectors,female burg strips,18 pin ic base, pcb

you may use 16 gauge wire to make a small antenna for better reception,soldering rod ,soldering flux and soldering wire, and of course some batteries to power your car and remote and red and black wires to connect the circuit. 9v battery will be good enough to power remote and for the car i used two 4 volt batteries to give a combined voltage of around 8v.

Step 2: HT12D and HT12E ICs

these ics are used to encode and decode the data to transmitter and from receiver respectively.

both are 18 pin ics, the encoder is feed with our data in parallel to its four pins which is converted to serial form and transmitted through the transmitter.receiver receives this serial data and feeds it to the decoder ic which again converts it to parallel data.i have added images to show the pin configuration.

the following is a link to a video on these two ics which will offer quite an insight :video


the motors need quite a good amount of current to run so we use this ic to which the output of ht12d is feed in its signal pins and power and motor are connected according to pin config ,since here we are not using any microcontroller the supply to 1,8,16 are the same.

here's a link to informative video :video


lets start with making the remote control.

place the required components on the pcb as you like and solder them ,i have uploaded an image of mine for reference.

as you can see i have placed the two dpdt switches at the end with 20pin ic base in middle (as i dint had 18pin base :D),from the three resistors one is for led and the other two combined make a resistor of approx. 1 mega ohm(value must be close no need to be accurate) for oscillator of HT12E,then i have placed 4 female burg in strips for my transmitter (place as much required because some have just three pins i.e vcc,data,ground. Here fourth pin is for antenna connection).i have made an antenna out of the 16 gauge wire by winding it over a pen,and finally you can see the battery connector in place.

EDITED:I have attached pcb schematics of the same and also an image of it for quick reference.

Now about connections:

The first 8 pins of ht12e are address pins(A0 to A7) which need not be connected i.e they can be left floating or else you may ground all of them,pin 9 has to be grounded.

In dpdt you will find a pair of 3 connectors (if you find more some would be internally shorted check it with a multimeter)join them as in fig using red and black wire.After doing so with both dpdt you will have four output wires, connect them to pins 10,11(from one dpdt) and 12,13(from other dpdt) of ht12e.

pin14 is transmission enable pin, when it is grounded only then the signals are transmitted so ground this pin.

pins 15 and 16 are the oscillator pins where you need to connect your 1 mega ohm resistor.

pin 17 is the data output pin of the ic which has to be connected to data pin of the transmitter,finally pin 18 is the vcc pin so connect it to the positive terminal of the battery.

if you want u can place a led light also connected to the battery terminals through a resistor.

finally connect the vcc and ground terminals of the transmitter to battery terminals.

Here battery terminals are the battery connector that i have used.

and you are done with the remote.I have attached a picture of the back side of the remote though it may not be much of a help but still :p...

Note:please try and use at least two different color wires and if possible use three(one for signal and other two for battery connections)as it would be easier to debug at the end which is the toughest part.



place the components on the top of your pcb and solder them on it ,two led in front for headlight,one led is to show that valid data transmission has occurred between transmitter and receiver.See the attached image to place the components.4 female burg in strips are in front for receiver ,then we have the two ic bases for HT12D and L293D( 18 pin and 16 pin bases resp).out the three resistors two 1k resistors for headlight leds and one is 51k approx. for oscillator pins of HT12D.solder the two capacitors in parallel to increase net capacitance (more the capacitance the better it is).

EDITED:I have attached pcb schematics of the same and also an image of it for quick reference.

Now ,how to connect

firstly pins 1 to 8 of the ic HT12D need no connection or ground them if you have done so with the address pins of HT12E or else leave them floating.then pin 9 is grounded.pins 10,11,12,13 are the data output pins from this ic ,connect them to 2,7,15,10 of L293D resp. pin 14 of HT12D is data input pin which you need to connect to data pin of receiver,next up pin 15 and 16 are the oscillator pins so connect your 51k resistor across these pins (again i would say accurate value doesn't matter),pin 17 is the valid transmission pin connecting an led to it will show whether the data has been received or not,this pin remains active high and when the ic receives a signal it goes low,so connect the -ve pin of led to pin 17 and +ve pin of led to battery positive terminal.now whenever data is received the led will glow and otherwise remain off. finally pin 18 is vcc pin so connect it to positive terminal of battery.

we initially connected the pins 2,7,15,10 of L293D,now its time to connect its other pins also...

pins 1,9 are the motor enable pins when the are high only then motors will catch signal and run so connect these pins to positive of battery.connect pins 3,6 to one motor and 14,11 to the other motor,pins 4,5,12,13 are to be grounded,now connect pin 8,16 to positive battery terminal and battery ground is connected to all the ground pins of L293D.

capacitors act as glitch busters,connect their positive and negative to vcc and ground resp. of receiver and also connect the vcc and ground of receiver to the battery,in other words from both vcc and ground terminals of receiver we have two wires each one to suppy and the other to capacitors.

i dint had these caps in the beginning, so the car wasn't responding to the signals properly ,it will catch the initial signal only and keep on running on that signal until and unless i give signal being in very close vicinity of car.this happens because initially motors are at rest therefore the receiver is having an appropriate supply which enables it to catch the signal but when the motors run they draw a lot of current due to which insufficient amount of current goes to receiver and it fails to catch the signal ,so placing capacitors with it gives it a boost of current and receiver catches the signal.

And that's it we are done with the car too...


watch the video to see a test run of the car.

if anyone has any problem regarding the instructable please mention it in the comment section ,i will try to solve your problem. the schematic files are .fzz files and u will need fritzing software for it.

here is the download link: http://fritzing.org/home/

please leave your comments and review which would help me do a better job in writing instructables ,and thank you for bearing me guys :)...

Step 7: Rc Car V2.0

i have uploaded a new instructable on updated version of this car which you can check out here-rc car v2.0.

Please tell idea about rc control car using 434 mhz RF controll
Hii Abhishek , actually I want to fix wheels in the front n alps want to turn them. Can u tell me how can I do this
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 .
<p>i have made a wired RC car and now I want to convert into wireless using receiver and transmitter but I don't how to connect it would u please help me</p><p>I can bring receiver and transmitter from market but how to connect into my RC car please reply asap</p>
Also what is the RPM
<p>Rotations Per Minute</p>
.fzz file didn't support my phone<br>why?
What is the rated voltage of your dc motor
<p>Hey there!</p><p>I wonder why there is 2 capacitors on the car but only one in the .fzz file? Is it a mistake or am I missing something?</p><p>Have a good day!</p>
hi there <br>the .fzz file is having one single capacitor of 2000uf but since I had 1000uf capacitors with me I joined them in parallel to give the same affect.
​Why didn't you gave any clear circuit diagram? Not even a pencil sketch! The PCB (?) diagram images you gave are just awful.. The tutorial is good but designed in a bad way.
start appreciating others work and offer advice in a constructive way that might help you in the future...
<p>I know how to appreciate, but appreciation only goes to who deserves it. BTW, I admitted already that your tutorial was nice. In addition I just mentioned some serious draw backs of the article. Your intolerance with criticism <strong>might not help you in the future...</strong></p>
Going to try make this as a project but I have no idea how to start!
<p>Hello there!</p><p>Will this work with 2200 uf capacitors?</p><p>I have some and wondered if I could use them.</p><p>thanks!</p>
<p>hi again,</p><p>I just found two 1000 uf capacitors, should I use them instead?</p><p>Also, I wonder if there is anything else I should think about?</p><p>thanks</p>
just try both and see what works better for you
hey there ,<br>yes you can definitely use them more the capacitance the better it is ....
Plz could you send me the schematic cuos i want to make the pcb by handmade
hi Salehia ,<br>the *.fzz files will guide you through the connections but I don't have a PCB layout of the same ,try making it using eagle or you can refer to my other instructable which consists of a PCB designed in eagle.<br>
<p>hi these people dont reply i dont know y</p>
calm down my friend , you can always first try and locate the answer to your question in the previous comments usually it happens you will find your answer like your question was on car cost and has been answered before :)
<p>Sorry mai step four par pas giya hoin</p>
hey Ali , <br>if you are still in the making then please be more precise about what problem you are facing in step 4.
<p>may i help you ??<br></p>
sir can you provide me the basic circuit diagram for remote controller and car.
hey dayal ,<br>the instructable put up here in itself is pretty basic and the *.fzz files are the basic circuit diagrams you can just go through them.
<p>hi, can we change the frequency of the transmitter and receiver : \</p>
not possible but yes you can buy any other RF pair which operates at a different frequency just like 433Mhz and that will work too
<p>sorry, if the dpdt switch is working in ac then i have a problem or not??because i accidentally try this and my car is moving but the reaction of it is too slow some times and if i take it a meter away from the remote it doesnt reply to the switch and it is just continiusly spining(sorry for my bad english)</p>
hi there ,<br>if by AC you mean alternating current then your car must not even move as it would mean your controller is rapidly changing the signal back and forth to the car and hence it shouldn't even move or you will just see some movement depending on the frequency of AC and nothing more , it's made to operate on DC so try using batteries , that will help...
<p>Abeisheik step 4 sumja do gai</p>
<p>Abeisheik step 4 sumja do gai</p>
<p>Abeisheik step 4 sumja do gai</p>
<p>Abeisheik step 4 sumja do gai</p>
<p>Abeisheik step 4 sumja do gai</p>
Where can i found the schematic cous i want to made the pcb by myself
the car.fzz file
<p>How much is this car to make??</p>
around 600 Indian rupees.
<p>pls.. I will wait for your reply.</p><p>I am very much interested in all this and want to become an engineer.</p>
I'm really sorry my friend getting back to you very late, but there are definitely ample of videos and other stuff available but still I'll like to debrief you about them.<br>1. ic stands for integrated circuits which means all the components required to make something work are integrated into a small chip and if you want to learn about any IC you should Google it by its name like l293d motor driver IC look for it by its name l293d motor driver and you surely will get the results.<br>2. PCB are nothing but printed circuit boards where instead of making connections between various components using wires the whole circuit is in the form of copper tracks layed on a board but here we are not using that PCB, instead it has holes in it to mount the components and join them together using wires.<br>hope this helps....
Plz could you send me the schematic cuos i want to make the pcb by handmade
Plz could you send me the schematic cuos i want to make the pcb by handmade
By the way i am Ibrahim from Egypt
By the way i am Ibrahim from Egypt
<p>hi, I am kshitij. You see I am just 14, so I don't know anything about these ic's and pcb's. I tried my best to learn all this on the internet but couldn't find any video or site from which I could learn all this. So I kindly request you, if you can send some links from which I can learn the required things for this rc car. Pls... it's a humble request.</p>
<p>Hi, I am Mihir. Well I need to make my project before 30th of this month. I need an early reply. Will this car work if I am using 433 Mhz Reciever</p><p></p>
yes it will work

About This Instructable




Bio: hello there I'm an engineering student in instrumentation and control and like making simple projects on electronics, that's it :).
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