Introduction: Low Cost Arduino Jammer 433 Mhz

Picture of Low Cost Arduino Jammer 433 Mhz


In this project I will demonstrate the use of an arduino
as a jammer for the range of 433 Mhz using only 2 element´s

List of


-433 RF Module

Step 1: Project

Picture of Project

For this project I use one breadboard but you can
simple connect the RF transmitter to the arduino, and also you can get the
power from the arduino board, I use 12 Volts.

The arduino will generate one square wave and it will
feed the RF module

I get the spectrum using one RTLSDR at the distance of
2 meters from the antenna

Step 2: Spectrum of the Arduino Jammer

Picture of Spectrum of the Arduino Jammer

Step 3: The Test

Picture of The Test

The test
was conducted using as an reference an CAR KEY, The typical spectrum of 433 Mhz
car Key is in figure A, the scale is in
db, the measures were taken using one RTLSDR Pen

Step 4: Where Is Wally ???

Picture of Where Is Wally ???

After I turn on the arduino and I press the car Key I get the spectrum of figure...

Where is the signal Key..

Step 5: Code

Picture of Code

And now the best part .. the source code of arduino ;

void setup()

void loop()

tone(8, 15000); // generate square wave



design by (mail(at)


Mr_Dharma (author)2017-12-29

How to jam 3g or 4g mobiles Sir ? Can u explain this following comment of yours

triangle wave generator+noise generator-->vco max 2623-->rf power amplifer

OrlandoC26 (author)2017-05-09

Dear Fprocyon:

Could you please send me a e-mail with the RF amplifier diagram to increase the jammer range?



asterix93 (author)2015-08-17

You can increase the range of the jammer? using an amplifier?

fprocyon (author)asterix932015-08-18

Yes i could, but it was not the primary objective in this project, you can change the 433 RF module and use one TX-SAW433/S-Z with one amplifier stage using one BFG135 transistor..mail me and i will send to you the diagram

SuntA1 (author)fprocyon2017-04-17

Hello, Can you send me the diagram?

Maliieroglu06 (author)fprocyon2017-03-06

Hi Brothers.i am from turkey.firstly, i need gsm jammer project with arduino diagram and programme code for final project. Share with me ? İ cant speak well english but understand. :)

RobertF245 (author)fprocyon2017-02-11

Can you send me too diagram please.

dineshhnde (author)2017-02-21

i need make GSM jammer for final year project. please send me arduino codes and RF module number.

dineshhnde (author)2017-02-21

can u send me 900+1800 jammer codes

vamseeK5 (author)2017-02-04

Can it jam that signal of phone

CarbinerA (author)2017-01-16

how can i do somthing like 3g or 4g jammer ? can email me how to develop it ? email me sir

akshayav3 (author)2016-10-15

this is cool.but can u explain about 900mhz jammer?like can u give me the circuit for it? email

manolis.kasos (author)2016-03-12

can I replace 433 RF module with a module that will generate 900mhz signal and if yes can you give me a link of a shop that sells one (like e-bay)??

fprocyon (author)manolis.kasos2016-03-14

No, you have to figure out another alternative for that frequency (GSM), i can suggest the following configuration: triangle wave generator + noise generator -> VCO Max2623 ->RF power Amplifier

It´s a more complex circuit

akshayav3 (author)fprocyon2016-10-15

can u plz give that circuit diagram? my email

seamster (author)2015-03-24

This looks interesting, but I'm not familiar with what a "jammer" does. Can you elaborate?

weish (author)seamster2015-03-24

pumps a bunch of gibberish onto the 70cm radio band, blocking legitimate signals from amateur radio operators, car remotes, and most importantly, radiolocation technology used by the UK and US governments. they're easy to build and illegal to operate.

diy_bloke (author)weish2016-10-07

they may be illegal to operate, but who is to say what is a jammer and what is not. If I have a 433 Mhz operated Switch and i just happen to switch my lamps a lot... is that a jammer? (it is a rethorical question :-) )

fprocyon (author)seamster2015-03-24

In this case the arduino inject one square wave in the RF module producing noise in the range of the frequency of the RF module.
Basically i create an damn party in the 433 Mhz

NazarulA (author)2016-08-22

Hai . Im nazarul from malaysia . Can i ask your team help on how to develop the simple diy jammer . For blocking only 3g or 4g frequency and just allow gsm running in around 5 to 10 min . Im taking final year project . And im doing this for study purpose . Unfntly, this country still lack on these jammer knowledge . Perhaps your team able to teach me a little bit how to develop it . And the medium that can be used . Bcause i cant find any other way to do this project . Thanks you

zico9713 (author)2016-05-03

can increase the range of the jammer?

fprocyon (author)zico97132016-05-07

In this project i am limited to the power of the RF circuit (10 mW), but you can connect one second stage amplifier, for example the MSA-0886 or you can google a little bit to found another chip

zico9713 (author)fprocyon2016-07-22

Can you send me the diagram for the conexion?

AndreaD20 (author)2016-05-27

Hi, can you please tell me what did you use for the graphics? Is it possible to use processing? If so, how?


fprocyon (author)AndreaD202016-07-12

The graphics are from the program SDRSharp, i used one sdr to test the signal.

lIhelixIl (author)2016-07-03

so why exactly is the arduino needed? Could you not just supply power to the transmitter, connect a antenna and call it good"

fprocyon (author)lIhelixIl2016-07-12

Please use the scientific method to test your approach:

Step-by-step approach consisting of identifying and defining a problem, accumulating relevant data, formulating a tentative hypothesis, conducting experiments to test the hypothesis, interpreting the results objectively, and repeating the steps until an acceptable solution is found

SepehrA (author)2015-09-14

i will jams what ? cell phone signal ??

diy_bloke (author)SepehrA2015-10-06

nope. it will jam 433 MHz signals

lIhelixIl (author)diy_bloke2016-07-03

so hypothetically of course, if my wireless security system operates on a 433.92 MHz frequency, This could interrupt the signal between my door sensor my base station.

diy_bloke (author)lIhelixIl2016-07-03

most likely yes

mnazarulakram (author)2016-03-30

how can i do somthing like 3g / 4g jammer ? can email me how to develop it with simple way ? email me sir

manolis.kasos (author)2016-03-12

can I replace 433 RF module with a module that will generate 900mhz signal and if yes can you give me a link of a shop that sells one (like e-bay)??

ralrigs (author)2016-02-24

would this work with a wifi module ?

himanshu6611 (author)2016-02-02

hi fprocyon!

I just had a doubt. the tone() function has the syntax as tone(pin,frequency) as stated by

Could you please clarify why you wrote 15000 (in Hz) there,when we want to generate 433Mhz?

Or is it that using an rf transmitter always generates a signal of 433 Mhz, no matter what you write on it's data transmit pin?

A quick reply will be really appreciated.

fprocyon (author)himanshu66112016-02-09

hi the rf transmitter always generate the 433 Mhz signal we are simply generating noise in that frequency, the concept is: when you are in one room and just two persons talking witch other the message transmits without problems, but when appears one third person screaming then the message is destroyed.
the 15Khz signal is the screaming guy ...

stalker145 (author)2015-04-25

For those not as paranoid as I, let me say that this can also be used as an inexpensive means of jamming common IED triggers such as automotive key fobs.

Sure, the use may be illegal in most first-world locations, but the knowledge is not.

ibenkos (author)2015-03-26

This is awesome! Nice idea, thanks for sharing :)

weish (author)2015-03-24

why would you want to build a jamming radio like this? although 433MHz is used in things like car remotes, that's a secondary market use and its primary usage is in radiolocation technology. not to mention, creating harmful interference is a crime and could land someone in hot water if they get caught. I know there are other jammer tutorials on this site, but I will never understand the draw. this isn't some harmless prank item, running one of these is a crime and faces potentially serious punishments.

fprocyon (author)weish2015-03-24

It´s the use that you give that makes an weapon, this project is just an tool nothing more.
My primary objective is to archive the simplicity of the solution, what you do with this is your own business.

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