Controlling Motor with a Cell Phone

The following article describes a very simple circuit idea which can be used for controlling a motor's rotational direction i.e. for moving it either clockwise or anticlockwise through alternate miss calls from your cell phone.

The Circuit Concept


I have already discussed a novel cell phone controlled remote switch circuit where the unit can be used for switching an electrical gadget through the users cell phone. The user just has to call the remote system which responds to the blank calls  and generates the required alternate switching of the connected gadget.

The same circuit has been used here also, the output is appropriately modified such that now the unit becomes suitable for toggling the rotation of a DC motor.

The circuit shown below can be used for controlling a motor rotational direction, let's try to understand it's functioning details:

The lower section of the diagram consisting of T1, T2, T3 and T4 along with the associated components forms a simple high gain audio amplifier circuit.

This circuit is used for amplifying the ringtone generated by the attached modem cell phone unit.

How it Works


The modem cell phone handset is an ordinary NOKIA 1280 cell phone which is permanently integrated with this circuit.

The above modem cell phone  uses a prepaid SIM card and thus it becomes a self contained receiver module.

When this modem cell phone is called by the owner's cell phone, its ringtone activates and gets amplified by the above explained tone amplifier stage.

The amplified signal becomes powerful enough to triggers the relay RL1.

This relay holds or remains activated as long as the call stays connected, and breaks when the call is disconnected.

RL1's N/O contact is supplied with a 12v trigger to the adjoining stage which is a FLIP/FLOP stage, made by using four NAND gates from the IC 4093.

With every alternate missed calls from the owner's cell phone, the modem cell phone signals the tone amplifier, which activates RL1, and RL1 in turn flips or flops the IC1 circuit.

The output of the flip flop is connected with a relay driver circuit which is attached with two relays RL2  in parallel. You may use a single DPDT relay also for better convenience.

The contacts of the relays are configured in such a manner that flipping them produces opposite movements for the motor that's integrated to them.

The mains supply to the relay and the motor is taken from RL1, which means the motor flips with every subsequent "missed calls" and remains activated until the call stays connected, and then halts.

The circuit can be modified in many different ways as per the users specifications.

The modem cell phone should be appropriately assigned with a particular continuous ringtone while the default ringtone should be assigned to "empty", tis will make the unit immune to unknown numbers or wrong numbers, and the owner will be the sole controller of the attached circuit and the motors.


Parts List


All resistors are 1/4w 5% CFR unless otherwise stated.

R1 = 22k
R2 = 220 OHMS
R3,R11,R12 = 100K
R4,R6,R7,R9 = 4.7K
R5 = 1K,
R8 = 2.2M
C1,C4,C5 = 0.22uF DISC TYPE
C2,C3 = 100uF/25V
T1,T2,T4,T5 = BC 547B
T3 = BC557 B
ALL DIODES = 1N4148
IC1 = 4093
RL1 = RELAY 12V/400 OHMS SPDT
RL2 = Relay DPDT 12V/400 ohms
L1 = small buzzer coil, small choke or similar.
JACK = 3.5mm AUDIO JACK
CELL PHONE MODEM = NOKIA 1280

Video clip showing the remote control operation of the circuit using a cellphone.


Need Help? Please send your queries through Comments for quick replies!




Comments

Lost Fragment said…
hello sir,
are the relays DC or AC?
Swagatam said…
R10 = 2.2M

R13 = 100 ohms
Swagatam said…
No, speaker signal from cell phone is not negative based, here we require negative based signal, meaning one terminal should connect with the negative of the supply.
Ankit Sinha said…
Dear swagatam,

i am trying to build 1st part of this circuit only but not able to toggle that relay i am building only that area which includes relay, IC 4093, BC547B & etc i didn't build receiving section but not able to understand which wires has to get sorted to trigger the relay. i tried to sort wire coming from R12 with positive wire of the supply but it didn't worked. please help me out ASAP

Thanks in Advance
Swagatam said…
Dear Ankit,

I would like like to repeat my answer which I did in your previous comment, touch the positive momentarily with the point that is going to the relay RL1, as you touch and release it T5 relay will switch ON/OFF alternately.

your previous comment was answered here:

https://homemade-circuits.com/2011/12/build-these-simple-flip-flop-circuits.html
sneha kalra said…
we can't use any other phone.....??
Swagatam said…
for the modem?? yes, if it includes an assign tone facility.
sneha kalra said…
we have to
use 2 relays in relay 2 ckt..??
Swagatam said…
yes, two relays are used in the upper section, relay coils connected in parallel.
sneha kalra said…
sir, in this ckt the two led which are connected to the relays are glowing but the motor is not rotating.what is the meaing tha the led's are glowing and relay is also producing sound that means it is also working but motor is not rotating.there is some error in this circuit?please help its really urgent.
Swagatam said…
The diagram correct, in the shown position the (+) passes through upper relay N/C into the motor and comes out of the motor to pass through the N/C of the lower relay to (-), in this condition the motor will rotate in one direction,
now if the relay is activated, the opposite will happen and the motor will rotate in the opposite direction.
Did you connect the N/C and N/O of the two relays to ground(-) as shown in the diagram??
sneha kalra said…
yes ia have given ground to them..i have connected relays to the common terminal of both the relays...is this correct?
sneha kalra said…
yes sir i have given ground..i have connected the motor to the common terminal of both the relays is this correct ??
sneha kalra said…
does the motor is affected by the volume of the tone of the phone cum modem.??
sneha kalra said…
thanku for the replies...
Swagatam said…
The mortor has no connection with the modem, you can clearly see that the motor wires join with the positive/negative supply via the relay contacts and no connection with the modem.
prerna kalra said…
sir,i am not understanding the usage of phone...please help its urgent..
Swagatam said…
Please read the bottom section of this article, it's comprehensively explained here:

https://homemade-circuits.com/2012/01/how-to-build-gsm-based-cell-phone.html
sneha kalra said…
in my circuit i think the tone of the phone is not amplified upto that level required for the circuit.
Swagatam said…
use NOKiA1280, in the "assign tone" use any musical tone instead of the suggested "beep once" tone
prerna kalra said…
it is compulsary to use nokia 1280...???
sneha kalra said…
can we use opamp to amplify ?? here what is the purpose of nand gate ic...???
Swagatam said…
i tested it on 1280 and therefore recommending it.
Swagatam said…
opamps wont work, nands are for generating On/OFF or flip flop actions on RL2
Jerry Satur said…
Hi sir its been 5 days since I have carefully doing this project and checking it carefully RL1 runs really smooth and has no problem at all, but RL2 has really giving me a big problem, sometimes relay works fine sometimes it wont, if I`m correct R11 and R12 are full down voltage resistor isn't it?, I also change IC 4093 4 x just guessing that this has factory fault but still same problem giving me, I have carefully double check my layout before posting here, but RL2 really dont work properly, what might be the problem of this?, I really do hope to finish this project, can you help me check the circuit diagram what probable cause we are having now, cause lot of us has the same problem running RL2 and regarding RL1 it is running well.. Thank You So much, more power to you..
Swagatam said…
Hi Jerry,

Make the RL2/4093 circuit separately and test it manually by triggering its input with positive pulses, you may refer to the following diagram for better understanding:

images.brighthub.com/8c/2/8c241a49a602156dd8edcb98e3826680a7c332b2_orig.jpg
Swagatam said…
...once confirmed it may be integrated back with RL1.
Jerry Satur said…
Ok Mr. Swagatam I`ll do it right away Thanks for the help, more power to you.. BTW Full down was wrong I mean pull down, sorry missed type it :)
Swagatam said…
OK thanks, R11/R12 are for discharging the center capacitor so that the circuit can be initiated every time quickly
Jerry Satur said…
Mr. Swag I have made modification changing RL2 to I.C. 555 it work fine now, Thankyou
powerex calicut said…
Sir
Thnks for givng the ckt. I did assembled this.
I got first stage, bt i can't get second flip flop stage,it's not done..pls give me a suggession.
Swagatam said…
Please see the second circuit from this link, it's the same as the above 4093 stage, this will help you to compare the stages and troubleshoot:

https://homemade-circuits.com/2011/12/build-these-simple-flip-flop-circuits.html
Deepak Mittal said…
hello nokia 200 is best
sreelal said…
hai ,
I want more explanation about ON/OFF cycle ( What I meant is whether the motor will sustain for ON for long . How it is controlling the ON/ OFF. There is no explanation for IT.) From the explanation what I understood is the motor will be working only during the ringing period of the mobile .It will be sustain only for few second .

Thanks
Sreelal
Swagatam said…
The motor will run either clockwise or anticlockwise alternately, in response to the toggling of RL2....the motor will not stop until power is switched off.
abhishek yadav said…
Sir I use of CD4093 but my relay 2 always on or no turn off
Swagatam said…
go through all the comments above...you may get a clue
Vinod Chavan said…
hi swagatam im your big fan..shall i use this circuit to on off three phase motor.?
Swagatam said…
thanks Vinod, yes you can use the above circuit with 3phase motor, ignore the shown relay contact set up for the motor, for your application you will need to use a relay with 3 changeover contacts, or TPTT relay and simply connect all the 3 contacts in series with the motor wires and the 3 phase mains input.
Vinod Chavan said…
thanks for your valuable reply. i got it what you are saying but i want to connect this circuit to the 3 phase motor starter so that im able to on off motor connected to starter..
Swagatam said…
if you have a starter with your 3 phase motor then you wouldn't require the upper 4093 flip flop stage, you can simply connect RL1 contacts in parallel with the starter switch.

make sure that you end the call immediately as soon as the motor starts, so that the supply is fed only momentarily to the starter relay.
Manoj Jonam said…
hai sir i need to know how to control electricity in house to reduse electricity bills. plz give me an idea with circuit diagram
Swagatam said…
use all the equipment wisely...for example use TV sets with less contrast, use fridge at lower cooling adjustment, same with ACs and fans....you will see 50% reduction in the bill..
Dear Swagatam,
Can you publish a circuit to control AC motor with cell phone.
thanks
Swagatam said…
Dear Chandan, yes it can be done by using DTMF technology, however I don't like the concept because it consumes your cellphone's "talk time" and therefore the procedure is never free of cost.
gokul upase said…
Sir I want Controlling Motor with a Cell Phone -ful Circuit Diagram
Swagatam said…
Please explain the application clearly, elaborately and in good English....
Sheikh aakib said…
Sir please upload a block diagram of control a lamp by missed call aystem
Unknown said…
Hello Sir...I want to switch on & off AC 3 phase motor with every subsequent missed calls. Is this circuit suitable for my requirement?
And if there are any changes in the circuit..
Plz tell me as early as possible....
Swati Naykude said…
Hello Sir...I want to switch ON & OFF AC 3 phase motor...
Is this circuit suitable for my requirement?
And if there are any changes in this circuit ....
Plz tell me as early as possible...
Swagatam said…
Hello Swati, yes the above circuit can be used for the purpose, the upper two relays will need to be replaced with a single relay having three sets of contacts which can be then wired across the three wires of the motor and the AC inputs
Swati Naykude said…
Thank you sir...And one more question is that, Is there any design basis for this circuit?
If yes, then can you tell me that in detail with design steps also?
Plz send me on my email- swatilife123@gmail.com
Swagatam said…
Swati, sorry I did not understand what you meant by design basis....you will have to replace RL2 with a 3 contact relay or a TPTT relay in the above circuit for controlling a 3 phase motor.
Swati Naykude said…
Sir, I mean to say how to select components that is capacitors, relays,resistors,transistors,IC etc...
Swagatam said…
all are standard parts, nothing is specially rated..for example all resistors are 1/4 watt, all capacitors are as per 12V supply etc....only the TPTT relay will need to be rated as per the motor current specs.
Swati Naykude said…
Ok Sir..thank you...
And if we give missed call for switching OFF the AC motor ,then will it fully stop or continue its rotation in opposite direction...?
Swagatam said…
It will fully stop the motor.
Swati Naykude said…
Ok ...Thank you so much sir...
Big Tube said…
Thanks you very much, I want control my water pump ( motor) in my farm can it possible that this circuit,
Swagatam said…
yes that's possible
HSIPAWTAR said…
i need , 0 to 100 pounds adjust string tension dc12v motor control circuit.please sir.
Gajanan said…
hi.. How can i use above circuit to start and stop small dc motor.. where do i connect motor? do i need any other additional components? can any other phone can be used other than nokia 1280. Thank you..
Swagatam said…
Hi, you can refer to the following article for your specific application

https://homemade-circuits.com/2012/01/how-to-build-gsm-based-cell-phone.html

no modifications would be required.

you can use other cellphone also which may have identical features to the recommended NOKIA phone
vipin singh said…
Is this circuit can be available in market?
Gajanan said…
hi. i have checked the above link you specified but i am bit confused where and how to connect dc motor it would be very useful if you could tell me that. Because i am confused with the AC main supply in that circuit and load because dc motor does not require any ac supply as per my knowledge. if you could tel me in very perticular where to connect the motor. Thanks in advance.
Swagatam said…
Hi, you just have to replace the "AC input" with a DC input and the "load" with your motor
Gajanan said…
Hi. Is dc input is mandatory? Or can I directly connect two wires of motors to normally open pin and common pin relay will that work? If not any polarity is to be taken care while connecting dc input and motor. Thanks in advance
Swagatam said…
without DC input how would the motor get its supply??

the polarity can be anyway round, depends which way you want the motor to rotate anticlockwise or clockwise.
Gajanan said…
Hi. Thanks for clearing confusion. I did as u said but it dint work. I have connected positive 12v supply to one end of dc motor and other end of dc motor to relays normally open terminal and I have grounded the common terminal of relay is this the correct connection? And how can I debug my circuit?
Swagatam said…
thanks, so you mean to say that you are not able to figure out how to make the relay contacts operate a motor?? I am sorry then you must first learn all the basics and then come back here, because this project could be far too complex for any any newcomer.

the relay contact has to operate from N/C to N/O for the motor to work...
shiva parvati said…
Sir. Can I build this circuit by replacing cd4093 with ne555. Is there any way to modify it so that I can use a available part ne555.
Swagatam said…
Shiva, IC555 cannot be used as a flip flop...it can be toggled ON for sometime but after that it will switch OFF automatically.
Mansoor Basha said…
how about using 555 in bistable mode?
Swagatam said…
it will require relays, we have only one one relay in the above design
Swagatam said…
555 bistable will require two relays....
Fauzan Akmal said…
is it the same if i want to trigger the motor using phone's alarm?
Swagatam said…
yes it's possible...., but how can you trigger the alarm through a missed call??
can i use 1 12v battery to power the circuit
Hello sir
1st miss call dene ke baad relay quickly on hota hai but 2nd miss call dene ke baad 15sec.ke baad relay off hota hai
Swagatam said…
kaun sa relay RL1 ki RL2

R9 aur R7 ke series mein LED fix karo, yeh batayega kaun sa transistor ON reh jata hai
RL2 RELAY 15SEC KE BAAD OFF HOTA HAI
Swagatam said…
R12/C5 ka joint ko manually positive par bar bar touch kar ke deknho, RL2 ON/OFF hota hai ki...
can u please say me how to connect DPDT relay in this circuit ....... I dont know how to connect DPDT relay.... can u please explain about it
.
Ra Sek said…
Sir I need only motor on and off circuit board
Price tell me which bank transfer
Thank you sir
Swagatam said…
Rasek, sorry I don't sell materials in this website, but i may start soon...
pankaj mehar said…
Sir I want to make a wireless 3 phase mobile starter for agricultural purpose ....and I'll use for projects also...Sir plz...give me its ckt ingo and its ckt components details.....and how to design it
Swagatam said…
Pankaj, you can do it with an Arduino circuit as shown below:

https://homemade-circuits.com/2017/04/gsm-water-pump-controller-with-call.html

replace the relay with a TPTT or triple contact relay for the 3 phase control
sonu said…
Sir I want to make you help me
For that may I know your contact number

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