Cell Phone based DTMF Controlled Garage Door Opening System
The main objective of this project is to unlock a garage door by a mobile phone using a unique password entered through the keypad of the phone. Opening and closing of garage doors involves human labor. In this proposed system, the opening and closing of a garage door is achieved by using a mobile phone.
The owner can call to a mobile phone interfaced to the system which in turn is connected to the garage door that can open/close the door by entering the password. This method is very convenient as one doesn’t have to get down of his car to open/close the door physically.
This project is based on the concept of DTMF (dual tone multi - frequency). Every numeric button on the keypad of a mobile phone generates a unique frequency when pressed. These frequencies are decoded by the DTMF decoder IC at the receiving end which is fed to the microcontroller.
If this decoded values (password entered by the user) matches with the password stored in the microcontroller, then the microcontroller initiates a mechanism to door opening system through a motor driver interface.
Further this project can be incorporated with an EEPROM i.e., a non-volatile memory so that the password can be changed by the owner.
- 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
- 8051 series Microcontroller
- DTMF Decoder
- Voltage regulator
- Motor Driver IC
- DC Motor with sliding mechanism
- Keil compiler
- Language: Embedded C or Assembly
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Q: Which microcontroller is used in this project?
A: A 40 pin microcontroller from 8051 family is used in this project.
Q: What is DTMF based garage door opening system?
A: DTMF based garage door opening is controlling the movement of garage door through DTMF tones from cell phone.
Q: How is a real door demonstrated in this system?
A: As a sample, a CD loader demonstrates an actual door
Q: Can one use it with landline?
A: Yes it can be used with landline phone
Q: Can it be used with mobile phones?
A: Yes it can be used
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: What is the DTMF IC used?
A: IC 8870 is the DTMF IC used.
Q: What is the formula for calculating smoothing capacitor value?
A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q: Why my phone is not working for the project while it works with other phones?
A: The dialing tones generated by a phone forms as an input to the project for proper working. While some phones develop exact DTMF tones even before establishing a call while pressing the numbers, some other phones develop a flat tone for any number pressed. Besides the same, some phones the internal speakeroutput is not disabled owing to some specific setting enacted by the user. In these cases directly dialing through chord connection shall not work. However if a call is initiated to the dialed number mobile which is interfaced to the project it will work (provided the connector is not loose) as DTMF tones are compulsorily made available to the receiver from the exchange ,as all our IVRS works on those kind of tones. Therefore,if the project does not work by direct wire connection please try by dialing the number from any other phone. In order to be doubly confirmed make sure that while one inserts the pin to the cell phone the speaker gets disconnected failing which it is not going to work because the tones are sent to the project board only if the speaker of the cell phone is disabled.