Microcontroller based remote locator
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This research paper describes the design of a microcontroller-based remote locator system. The system consists of a base unit and multiple remote units that can be attached to objects. The base unit allows the user to enter codes for remote units and transmit a signal to make a selected remote unit beep, helping the user find a lost object. The remote locator allows lost items to be found without wires by using radio frequency transmissions between the base unit and remote units.
Microcontroller based remote locator
- 1. RESEARCH PAPER ON MICRO CONTROLLER BASED REMOTE LOCATOR Dept of Electronics and Communication Engineering NITTE MEENAKSHI INSTITUTE OF TECHNOLOGY Yelahanka, BANGALORE-64
- 2. PAPER AUTHORED AND CO-AUTHORED BY: KAMAL LAMICHHANE ASHWIN CHAPTE AVANEE BHAT. M. V KIRAN. M (B.E students of ECE, NMIT Bangalore)
- 3. INTRODUCTION: The main aim of this project is to develop a remote device that is used to locate the lost things by sending a signal to small remote units connected to various items in the surroundings such as watches, remotes, keys, TV remotes, purses, eyeglass cases, and cell phones.. Even emergency lights in case of a black out !! WHAT EXACTLY HAPPENS ?? When the particular thing is lost, the user uses a display to see the listed out objects, finds its predefined code and sends it. The remote unit attached to the lost item receives the transmitted digital code and produces an alarm to alert the user to locate the thing. The user can turn the alarm off on the movable device or use a button on the device.
- 4. WHY REMOTE LOCATOR SYSTEM ?? Less expensive than wired solutions. Sophisticated remote locators can be used in inaccessible areas Can be used in locations where wired infrastructure doesn’t exist. (add more if you can think of anything !!)
- 5. HOW IS THIS REMOTE LOCATOR DOING WITH RESPECT TO GLOBAL USERS?? Research has predicted that the users will almost triple by 2015 globally !
- 6. HARDWARE REQUIREMENTS: Keypad Liquid Crystal Display (LCD) screen 8051 Microcontroller UART cables RF transmitter and receiver Buttons or switches
- 7. SCHEMATIC BLOCK DIAGRAM OF THE SUBSYSTEM: This subsystem has basically got 2 units namely BASE UNIT and REMOTE UNIT.
- 8. BASE UNIT INPUTS AND OUTPUTS: INPUTS: 1. Vcc 2. Keypad 3. On/Off button 4. Alert Button 5. Audible Tone Off button OUTPUTS: 1. LCD 2. 8051 Microcontroller 3. RF Transmitter REMOTE UNIT INPUTS: 1. Vcc 2. Off button 3. Remote signal
- 9. LET’S GET STARTED.. (On the base unit) When an item is lost, the user scrolls through a LCD screen. The name of the lost item is found in the locator menu and the locator button is then pressed used the keypad. The locator or the user menu has three modes of operation: 1. SAVE MODE 2. ALERT MODE 3. LOAD MODE
- 10. 1. SAVE MODE: This mode is used to designate a code of each thing to be located and to assign each item to its remote device and then saved in the menu. The codes are entered into the list using KEYPAD. 2. ALERT MODE: The person is then able to scroll through the list of codes and locate the desired thing, he can then select the item and press the alert to transmit the signal (RF) to each remote unit. The remote devices then receive the transmitted signal and when the correct remote receives the signal, it sounds the alarm on the remote on the particular code. 3. LOAD MODE: When the person wants to add or replace a remote device in the menu. The added remotes each have a predefined code that is entered into the device and stored so that the device knows what signal to send in order to activate the remote for this new item.
- 11. MAIN MENU: The main menu allows the person to choose which mode of operation to be used. The menu is displayed on the LCD and the user uses the keypad to select the desired mode. Diagram 4 shows the software flow chart for the main menu.
- 12. SAVE MODE: The LCD prompts the user to choose which remote unit to save a name to a location. Then the person uses the keypad to choose which remote to be named and can then use the keypad to enter the desired name. The 8051 microcontroller then saves the entered name in a module and the LCD goes back to displaying the main menu. The device which is remote is not used during this mode of operation.
- 13. ALERT MODE: The LCD prompts the user to choose which remote unit is to be found. The input keypad is used to scroll through the list and choose the name of the desired item to be found. The 8051 microprocessor repeatedly sends the saved ID number to the RF transmitter. The circuit of transmitter transmits the RF remote signal to the remote unit receiver circuit. The receiver circuit then demodulates the received signal and outputs the signal to the decoding circuit. The decoding circuit determines the ID number and compares it to the predefined number of each remote device. The remote device that has the matching ID number produces the alarm until the user turns it off on the device or the remote unit itself, using the alarm off switch
- 15. LOAD MODE: The LCD prompts the user to choose which remote unit is being added. The input device keypad is then used to choose the proper remote unit for loading the data. After that the LCD prompts the user to enter the new ID number for the remote device, with the help of keypad. the microcontroller then saves the ID number in a module.
- 16. UART CIRCUITRY: (BASE TO REMOTE UNIT)
- 17. 1. The UART is used to separate the ID number from the packed serial bit-stream transmitted from the base unit of the subsystem. 2. The UART finds the beginning and the end of the transmitted signal and then chucks the start and stop bits that were added to the ID number before the transmission of the bits. 3. The UART then carries out the intended ID number (shown below) to the digital decoding and compare circuitry of the subsystem.
- 18. DIGITAL DECODING OR COMPARING CIRCUITRY
- 19. 1. The purpose of this circuitry is to determine the transmitted ID code and to compare this code to the predefined code of the remote device. 2. ID code is stored in each flip flop of an eight-bit shift register in order to decode and determine the ID number code. The output of each flip-flop will be compared to the predefined number for each remote device. 3. If each flip-flop output matches the predefined number code, the circuit produces a high output else it produces a low output to the tone generating circuit.
- 20. TONE GENERATING CIRCUITRY: The speaker on the device produces an audible alert tone when it receives a high input from the comparator circuitry.
- 21. CONCLUSION: When the particular thing is lost, the user uses a display to see where the object is. The code or an identity of the lost item is found in a predefined list of the lost things. The remote unit attached to the desired thing like display or watch receives the transmitted digital code from the unit and produces an alarm to alert the user to locate the thing. Its applications include using sophisticated, long range remote locators in inaccessible areas where humans can’t venture. (ASHWIN ADD MORE IF YOU HAVE ANY!)