Respected sir,
Me end my group fellows doing work on microcontroller based industrial load control system using DTMF based signals.. i dont know about literature survey how to prepared it? please do honour and help us. so that we might make our final year project successfully..
thanks.
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DTMF refers to dual-tone multifrequency signaling. This DTMF is used for telecommunication signaling over analog telephone lines in the voice frequency band between telephone telephones and other communication devices and the switching center.
The concept of tone DTMF (dual tone multifrequency) tone command received from any telephone to remotely switch any electric load such as agricultural pump, domestic and industrial loads, etc. In industries, loads extend over a large area and so Therefore, the operation of these Loads is a very difficult and difficult task.
In agricultural fields too, pumps and other loads are connected in a large area and, therefore, it is difficult for the farmer to operate all loads and similarly for maintenance loads of the house. With these problems in mind, the proposed system using DTMF technology has been designed to control loads remotely.
A cell phone is interconnected to a DTMF decoder in the system from its audio output socket to receive tone commands. Receiver cell phone codes are converted into digital commands using a DTMF decoder that will identify the key frequency and convert it into its equivalent digital code that will be fed into a microcontroller (8051 family).
Depending on the commands sent from the sender's mobile, the microcontroller will send signals through a buffer to trigger the respective loads by activating / deactivating the relays. These relays are driven by an IC relay controller connected to the microcontroller.
