• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Need circuit help? Post them in the comments! I've answered over 50,000!

Blog | Categories | About | Contact | Calculators-online
You are here: Home / Motor Controller / How to Control Motor with a Cell Phone
warning message: electricity is dangerous, proceed with caution
cellphonecontrolledmotorcircuit

How to Control Motor with a Cell Phone

Last Updated on July 3, 2019 by Swagatam 98 Comments

In the following post I have explained 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.

Table of Contents
  • The Circuit Concept
  • How it Works

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.

You'll also like:

  • 1.  AC Motor Speed Controller Circuits using Back EMF
  • 2.  3 Phase Induction Motor Speed Controller Circuit
  • 3.  Delay based Motor Speed Controller Circuit – Timer Controlled
  • 4.  Automatic Torque Optimizer Circuit in Electric Motors
  • 5.  Infrared (IR) Motor Remote Control Circuit
  • 6.  High Voltage DC Motor Speed Regulator Circuit

Filed Under: Motor Controller, Remote Control Circuits Tagged With: Cell, Control, Motor, Phone

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

Previous Post: « LED Fader Circuit – Slow Rise, Slow Fall LED Effect Generator
Next Post: Solving LDR Controlled LED Emergency Lamp Problem »
Subscribe
Notify of
guest
guest
98 Comments
Inline Feedbacks
View all comments

Primary Sidebar

circuit simulator image

Subscribe to get New Circuits in your Email

Categories

  • Arduino Projects (90)
  • Audio and Amplifier Projects (132)
  • Automation Projects (17)
  • Automobile Electronics (101)
  • Battery Charger Circuits (84)
  • Datasheets and Components (105)
  • Electronics Theory (140)
  • Free Energy (38)
  • Games and Sports Projects (11)
  • Grid and 3-Phase (19)
  • Health related Projects (25)
  • Home Electrical Circuits (12)
  • Indicator Circuits (15)
  • Inverter Circuits (89)
  • Lamps and Lights (142)
  • Meters and Testers (71)
  • Mini Projects (46)
  • Motor Controller (64)
  • Oscillator Circuits (28)
  • Pets and Pests (15)
  • Power Supply Circuits (89)
  • Remote Control Circuits (50)
  • Security and Alarm (64)
  • Sensors and Detectors (103)
  • SMPS and Converters (31)
  • Solar Controller Circuits (60)
  • Temperature Controllers (42)
  • Timer and Delay Relay (49)
  • Transmitter Circuits (29)
  • Voltage Control and Protection (38)
  • Water Controller (36)

Other Links

  • Privacy Policy
  • Cookie Policy
  • Disclaimer
  • Copyright
  • Videos
  • Sitemap

People also Search

555 Circuits | 741 Circuits | LM324 Circuits | LM338 Circuits | 4017 Circuits | Ultrasonic Projects | SMPS Projects | Christmas Projects | MOSFETs | Radio Circuits | Laser Circuits | PIR Projects |

Social Profiles

  • Twitter
  • YouTube
  • Instagram
  • Pinterest
  • My Facebook-Page
  • Quora
  • Stack Exchange
  • Linkedin
  • Recent Comments

    • Swagatam on Make this 7 Segment Digital Clock with Beep Alert Circuit
    • Naina on Make this 7 Segment Digital Clock with Beep Alert Circuit
    • Swagatam on Simplest AM Radio Circuit
    • Swagatam on Make this 7 Segment Digital Clock with Beep Alert Circuit
    • michel van simaeys on Simplest AM Radio Circuit

    © 2025 · Swagatam Innovations