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The project works on the concept of DTMF (dual tone multi frequency) tone command so received from any phone to remotely switch any electrical load such as agricultural pump, domestic and industrial loads etc. In industries, the loads are spread over a large area and thus, operating these loads is a very tiresome and difficult task.

In agricultural fields also, pumps and other loads are connected over a large area and hence it is difficult for the farmer to operate all the loads and similarly for house hold loads. Keeping these problems in mind, the proposed system has been designed which uses DTMF technology to control the loads remotely.

A cell phone is interfaced to a DTMF decoder in the system from its audio output socket for receiving tone commands. The receiving cell phone codes are converted into digital commands by using a DTMF Decoder which will identify the frequency of the key and convert that frequency to its equivalent digital code which is then fed to a microcontroller (8051 family).

As per the commands sent from the sender’s mobile, the microcontroller will send signals through a buffer to actuate the respective loads by turning the relays ON/OFF. These relays are actuated by a relay driver IC interfaced to the microcontroller.

Further this project can be enhanced by using a GSM modem, where the loads can be controlled by sending an SMS. This will eliminate the need of answering the call for the system to work.

Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
Call/mail for Tech Support from 10 am - 7 pm.
Can be Customized for Arduino, Raspberry Pi, PIC
DTMF based Load Control System
Hardware Requirements
  • 8051 series Microcontroller
  • Transformer
  • DTMF Decoder
  • Relays
  • Relay Driver IC
  • Inverter IC
  • Voltage Regulator
  • Crystal
  • Diodes
  • Resistors
  • Capacitors
  • Lamps.
Software Requirements
  • Kiel compiler
  • Languages: Embedded C or Assembly
Q & A
Q:  Can we use it with landline phone?
A:  Yes, it can be used with landline phone to control the loads
Q:  Can it be used with mobile phones?
A:  Yes it can be used with mobile phones.
Q:  What is DTMF?
A:  DTMF or Dual tone multi frequency is a signaling system which uses a combination of two frequency tones to represent a key pressed on the keyboard of any cell phone.
Q:  Which is the DTMF IC used?
A:  IC 8870 is the DTMF IC used.
Average Rating
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Showing 4 of 7 reviews Show All
Talat Mohammadtaher Abdulkarim, Gujarat on 7th June, 2016, 06:49 PM

We came to know about edgefx is through google by searching load control
By seeing the website and the free delivery option
with the right components in right time
I directly purchased from online in your website
To develop more projects in all area
i will refer this site to our friends
i will go through your blog

E Abid Mansuri, Surat on 28th November, 2014, 10:51 AM

Yes the kit delivered on time with right components.The technical support is good.I will recommend about Edgefx in future.

Ravi Chaudhari, Ahmedabad on 28th November, 2014, 10:48 AM

The kit delivered on time with right components.I cleared all my queries and technical support is good.I already recommend to my friends.

Hemanth Mishra, Indore on 7th May, 2014, 04:36 PM

I decided to buy a kit from Edgefx because i was impressed by seeing your website. I bought a project kit from Edgefx and it was good and sufficient.It would be better if the cost is reduced.

Rating Breakdown (7 Reviews)

Edgefx Technologies Pvt. Ltd.,
Plot No. 105, 3rd Floor,
Liberty Plaza, Himayathnagar,
Hyderabad - 500029,
Telangana, India
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