[pic]When you press the numbers on your phone to make a call‚ the tones you hear are called Dual Tone Multi Frequency tones (DTMF)‚ and they represent one of 16 possible numbers on the keypad. The DTMF tones are made up of frequency pairs ranging from 697 Hertz to 1633 Hertz. There are actually eight frequencies that form a 4x4 matrix of 16 possible tones by mixing the pairs together. DTMF signaling has proven to be a very robust method of sending data over the telephone system‚ and it has become
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Wi-Fi based Wireless advanced JAIL Security Automation ABSTRACT: - Now a day’s automation is playing important role in each and every field such as Industrial‚ Home‚ Rural‚ Agriculture and Security Areas. Usually we use to control & monitor the jail by human interference‚ which will have low security and even requires more human intervention. In order to overcome this problem‚ the advance Jail security automation concept can be employed which increases the security level and reduces human intervention
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avoid creeping in induction type meters To save power BLOCK DIAGRAM Energy meter Opto coupler Relay Load LCD 8051 microcontroller MC EEPROM Power supply Smart card Reader/writer HARDWARE COMPONENTS Digital energy meter (ADE7757) SLE4442 smart card reader/writer‚ MAX 232 EEPROM (SMART CARD) Relay and Power supply MCT2E Opto coupler LCD display 8051 microcontroller Digital energy meter EEPROM (smart card) • High accuracy ‚portability‚ • A microchip embedded in a plastic card
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and feeds the equivalent signal to the MCU. 7. LCD DISPLAY: Displays the obtained speed. 1.3 CIRCUIT DIAGRAM: 1.4 WORK PLAN: In this semester we are planning to design the optical tachometer and learn the basic operation of the microcontroller. START Doing some literature survey and studying the project Design the block diagram of the whole circuit Design the circuitry for each blocks Testing the hardware for the blocks Make changes to the circuitry. Is the
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and also this system will help us to keep the working environment in a pleasant and comfortable manner. In this system the number of persons present in the room (Person counter) can be included and also the data transmission from PIR sensor to microcontroller can be implemented through wireless such that the system will become a scalable one in the sense a single system can able to control a large number of rooms. Apart from these things the system can be upgraded to allow the users to configure the
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field to the microcontroller. It will send the information to the remote location receiver by using RF transmitter then the receiver will receive the details of agricultural field and will control. There are three receiver sections‚ in this first the soil sensor will see the fertility of the field and it is given to the pumping motor in the receiver section by using microcontroller. The second one is temperature sensor and it is given to the DC fan attached to the microcontroller in the receiver
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Abstract The work in this project involves development of a locationing system‚ that is capable of estimating position of a person and streaming video over the wireless network. This system can also be used inside a building (indoors) without the need of any external infrastructure inside the building.The system uses multiple sensors like camera and Inertial Measurement Units. All these modules are connected to the BeagleBoard-xM. The Beagleboard-xM collects data from these sensors ‚ processes
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Research on the HCS12 microcontroller 1. Provide a picture of the HCS12 / Dragon board. 2. What microcontroller family does the HCS12 belong to? The 68HC12 (6812 or HC12 for short) is a microcontroller family from Freescale Semiconductor. Originally introduced in the mid-1990s‚ the architecture is an enhancement of the Freescale 68HC11. Programs written for the HC11 are usually compatible with the HC12‚ which has a few extrainstructions. The first 68HC12 derivatives had a maximum bus
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Gas leak detection is the process of identifying potentially hazardous gas leaks by means of various sensors. These sensors usually employ an audible alarm to alert people when a dangerous gas has been detected. Common sensors used today include Infrared Point Sensor‚ Ultrasonic gas detectors‚ electrochemical gas detectors‚ and Semiconductor Sensors. More recently‚ infrared imaging sensors have come into use. All of these sensors are used for a wide range of applications‚ and can be found in industrial
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results in a train of pulses at the output of the photo diode‚ the magnitude of which is too small to be detected directly by a microcontroller. Therefore‚ a two-stage high gain‚ active low pass filter is designed using two Operational Amplifiers (OpAmps) to filter and amplify the signal to appropriate voltage level so that the pulses can be counted by a microcontroller. The heart rate is displayed on a 3 digit seven segment display. To count the heart beats‚ here we use a small light source on one
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