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DTMF-Based Home Automation Using Mobile Phones
- 1. W E LC O M E DTMF Based home automation... Sadia parvin ripa East west university
- 2. Introduction We use many different types of communication in control applications to control home appliances, industrial appliances, and other type of automation. There are two types of communication that is we generally use one is wired and other one is wireless. In wireless communication we transmits signal wirelessly, like using radio frequency (RF) and in wired communication in which we uses wires like copper wire. In this project “DTMF Based Home Automation System” we are going to control our home appliances wirelessly. DTMF controlled home automation project works over mobile DTMF technologythat exists in Dial tone
- 3. DTMF DTMF stands for Dual Tone Multiple Frequency. In simple words by adding or mixing two or more frequencies generates DTMF tone. When one upper and one lower frequencies mixed then a tone is created that tone we calls Dual Tone Multiple Frequency. In this project we control the circuit appliances by pressing dial pad keys like 1, 2, 3, 4, 5 and more.
- 4. Components 7805 Regulator Resistors(100K,330K) 3.57 MHz Crystal MT8870 DTMF Decoder Capacitors(0.1 uF) Connecting Wires WAX Wires 9V battery,LED,Mobile Phone
- 5. MT8870 The MT8870D is a complete DTMF receiver integrating both the band split filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code.
- 6. 7805 and 3.57mhz Crystal 7805 is a voltage regulator integrated circuit. The voltage regulator IC maintains the output voltage at a constant value A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric resonator, a crystal, as its frequency- determining element. Crystal is the common term used in electronics for the frequency-determining component, a wafer of quartz crystal or ceramic with electrodes connected to it.
- 7. Resistors and capacitors A resistor represents a given amount of resistance in a circuit. Resistance is a measure of how the flow of electric current is opposed or "resisted.“ A capacitor represents the amount of capacitance in a circuit. The capacitance is the ability of a component to store an electrical charge.
- 9. Working Here we have connected a mobile phone using aux wire to the DTMF decoder circuit If we press any key on the mobile phone then the corresponding row and column frequencies are given to DTMF decoder. Here the DTMF decoder will mix those frequencies and generates corresponding binary value. i.e.; 0
- 10. advantages Easy to maintain and repair . Comparatively the operation cost is less. Most importantly in this project we use no microcontroller. Design is efficient and low cost. Power consumption is low. Controlling electrical devices wirelessly Saves electricity (when we forget to switch off and go out). We can control appliances from any place round the globe. No coding is required.
- 11. disadvantages This system is not capable of displaying the feedback status of the devices being operated. This system needs a cell phone to be placed in circuit.Anyone who knows the phone number and can control our electrical appliances Number of electrical appliances that can be controlled by this circuit is limited
- 12. applications • This system can be used in industrial applications. • This system can be employed in houses, where people often forget to switch off electrical appliances. • This system can be used to control AC’s to set the room temperature when we are outside. • We can extend this circuit to control many electrical devices with some modifications using 4 x16 decoder IC..
- 13. conclusions In these by making these the circuit as the device is connected to a corresponding circuit, its gets activated as soon as the call is made to the circuit. In these as the keypad has12 different key, it can perform 12 distinct operation.
- 14. THANK YOU