Efxkits's Videos 63 videos
Model no:173 The basic idea for the development of the project is to provide supply to the single phase load if any of the phases, out of the 3 phases go missing. The kit is to be supplied with a 3phase power i.e., the three transformers are connected to the 3 phases supply. If any one of the phase is not available, the logic gates monitor the same at the low voltage of DC derived from ac of the secondary of the transformers to deliver output to the relay driver IC to change the load to the next phase through the contacts those are fed from all the three phases. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 3 Apr 2012
  • 717
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Model no:172A The main objective of the project is to intimate a desired number stored in an external EEPROM that someone is trying to open your bank locker in your absence. This project uses a microcontroller from 8051 family. Also an external memory EEPROM is interfaced to it for storing the number to which call is to be made. The module is placed behind the door and with microcontroller interfaced with a switch, which will detect unauthorized opening of the bank locker door and will automatically dial to the desired telephone number that is stored in the EEPROM through DTMF encoder interfaced to the microcontroller. Keypad is used for changing the password and a 16X2 LCD is used for display. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 3 Apr 2012
  • 647
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Model no:170 The main functionality of this project is to verify the identity / attendance of the user who needs to access it through RFID. For this purpose the authorized person is given an RFID card. This card contains an integrated circuit that is used for storing, processing information through modulating and demodulating of the radio frequency signal that is being transmitted. Thus, the data stored in this card is referred as the identification/attendance of the person. Once, the person places the card in front of the RFID card reader, it reads the data and verifies it with that data present in the microcontroller. Here we use microcontroller from 8051 family. And if the data matches then it displays a message as valid entry and allows accessing the device or else displays invalid and denies the access/attendance. For display a 16X2 LCD is used. The status also can be retrieved from this system by pressing the status button interfaced to microcontroller. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 2 Apr 2012
  • 471
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Model no: 168 This project describes the design and implementations from a single phase ac to high voltage DC power supply till 10kV output. The implementation of the hardware work to build a high voltage DC power supply is meant for use in the laboratory. The designed DC power supply can be used in industrial applications also. The design of the circuit involves voltage doubler, whose principle is to double the output voltage. The output from the voltage doubler is given to a series of cascaded circuit that generates up to 10KV but for the student project it is advisable to go up to 2KV for safety reasons. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 2 Apr 2012
  • 651
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Model no: 167 These Solid State Switches are phase controlled in a similar manner to a light dimmer, in that they are turned on for a part of each cycle. The average voltage is controlled by varying the conduction angle of the switches. Increasing the conduction angle will increase the average output voltage. Controlling the average output voltage by means of solid state switches has a number of advantages. One of the major advantages being the vast improvement in efficiency relative to the primary resistance starter, due to its low on state voltage of the solid state switches. Typically, the power dissipation in the starter, during start, will be less than 1% of the power dissipated in a primary resistance starter during start. Another major advantage of the solid state starter is that the average voltage can be easily altered to suit the required starting conditions. By variation of the conduction angle, the output voltage can be reduced, and this can be achieved automatically by the control electronics. After the motor reaches desired speed the semi conductor switches are bypassed to feed full voltage to the motor. A single phase induction motor is connected in series with two anti-parallel SCR’S and supply. The gates of the respective SCR’S are fed from two Opto-isolator LED’S are connected in series which are driven by a transistor BC558 IN series with another external LED. One quard operational amplifier LM339/ LP339 is used as comparators for developing zero voltage reference at its pin1, that passes through a driving transistor BC547. To charge and discharge 2.2uf capacitor through resistor10k thus at the collector of transistor BC547 a saw tooth voltage is developed which is fed to pin4 of LM339, being the inverting input. A level voltage derived from the soft start of LM324 output through a diode IN4148 is given to the non-inverting input pin5 of LM39. The level voltage at the time of switch ON remains rely high as a result the output pin2 of LM339 remains high to reverse bias the transistor BC558 thus depriving the input to the Opto-isolator’s through the series Red LED. This level voltage gradually falls which while compared with saw-tooth voltage develops a varying duly cycle with in 10msec time duration synchronised with the mains supply frequency. Therefore the varying duly cycle from 10% to 100% happening over couple of seconds results in slow power build up by the motor as the SCR’S are triggered slowly from 180 to 0 degrees. The soft start circuit that uses LM324 and a transistor BC558 works at the time of switch ON by a charging a capacitor 2.2mf through 10k resistor. Thereafter this capacitor discharges through 100k and 470k, the midpoint of which are given to a non-inverting pin of LM324. Thus as a capacitor gets fully charged during switch ON and gets gradually discharge. Pin 1 of LM324 output slowly falling from high to low thus as explained above. The motor gets slowly from minimum power to maximum power to enable a soft start condition for a motor. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 31 Mar 2012
  • 1 373
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Model no:161A The main objective of the project is to develop a circuit breaker which can be controlled remotely using cell phone. A unique password must be entered through the keypad of cell phone to activate/deactivate the circuit breaker. Each key of the password is identified with a frequency which is decoded to digital code through DTMF (digital tone multi frequency) decoder and that code is fed to a microcontroller which is programmed to recognize the code for operating the circuit breaker duly interfaced through driver IC for the load. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 31 Mar 2012
  • 678
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Model no: 159 The main objective of this project is to develop a project to control the appliance through SMS. Using any mobile a message is sent to another sim loaded GSM modem on board that receives the sms and feeds it to a level shifter IC MAX232 that feeds the data to a programmable microcontroller of 8051 family and the output logical data to relay driver IC that finally controls the home appliances or any load through its “NO” contacts and then sending a confirmation from the GSM modem upon the status of the load based on the data received from the microcontroller. All conditions are seen on a 16X2 display. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller, GSM modem and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 30 Mar 2012
  • 400
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model no: 156 The main objective of the project is to control the speed of a DC motor through PC. Keyboard commands from the PC generate PWM output features. The functionality of this circuit is that once the PC sends the command signal to the microcontroller through MAX232 that is used to convert the voltage level of PC to that of microcontroller. Later, the microcontroller analyses these signals and activates the motor driver to drive the motor as desired. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 30 Mar 2012
  • 193
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Model no: 154A The main motto of the project is to use the wireless technology effectively for the defense/military environments by using the GSM Modem used in sending SMS in case of burglary with intimation to police. The main scope of this project is to automatic locking system when burglary happened this can be done when ever a person trying to burglary at that time sends an interrupt to a programmable microcontroller of 8051 family, When someone tries to steal the things then microcontroller gets an interrupt and orders GSM Modem to send the sms,to the police station The control instruction is given to the microcontroller through interface, the output from which activates a relay driver to trip the relay locks the door of the house so that the burglar can’t escape. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 30 Mar 2012
  • 403
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Model no: 155 Based on the principle of PWM controlled BLDC / PMDC motor on closed loop feedback giving RPM reference of the motor by a shaft mounted IR sensor is fed to the control the circuit. A display unit displays the full speed and one can enter the desired percentage with help of Keypad to reduce the speed. The pulse width would be automatically adjusted to maintain the DC power to the motor such that the entered speed percentage matches the RPM. The above operation is carried out by using one opto isolator and a MOSFET for driving the BLDC motor IR sensing is used for getting the speed reference to the microcontroller as error signal somewhat equivalent to a fuzzy / PI logic control. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 30 Mar 2012
  • 480
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Model no : 152 The main objective of the project is to extinguish fire using robot which is remotely controlled through wireless using RF technology. The robot can move through any path whose motion is controlled by a RF transmitter using push buttons interfaced to a microcontroller. When the robot faces a fire then it is made to extinguish the fire with the help of pump motor connected to a water tank mounted on its body. RF transmitter module works as a remote to control the motion of the robot either to move it forward or backward and the motion of the water pipe up and down of the robot through which it throws water to extinguish the fire. On the robot RF receiver module is placed that receives commands from the transmitter based on encoder and decoder interfaced a microcontroller that delivers output accordingly for the motors via motor driver IC. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 26 Mar 2012
  • 564
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Model no : 150 More and more microcontrollers are embedded in a large area of products from industrial to domestic domains. A good example is the automobile, a modern one containing tens of microcontrollers. As their number increased the communication between them became necessary. The serial solution was preferred and a lot of serial buses and protocols were developed optimizing different parameters of the communication. Several examples are: RS232, LIN, SPI, CAN and so on. Monitoring serial communications is necessary in R&D phase, e.g. for creating virtual transfer partners, and in testing and debugging phases. The paper describes a message based monitoring tool using the RS232 Rx Tx features of the MC to communicate between 3 MCs for keeping track of the traffic movements of the previous junction with synchronization and changing the red signal to green so that a passing vehicle mostly gets green signal that results in least traffic jam. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 26 Mar 2012
  • 444
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The main objective of this project is to develop a project to control the railway gate through sms. This project works with GSM modem which is used to send a message when ever a railway gate is open or closed message is sent to the station master which is done by interfacing between a programmable microcontroller of family 8051 and GSM modem is done by a voltage level shifter called IC MAX232 which used a serial communication. the microcontroller sends a interrupt to make active for the motor to gate open /close with help of Motor driver called L293D that controls the motion or rotation of motor mounted at railway level crossing gate with display. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 24 Mar 2012
  • 874
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Model no: 109 The main aim of the project is to maintain information which is auto secrecy for the other persons in the field of telecommunications. This project is developed to fire out the hacking of information in communication system. In order to meet this requirement we are using 4 telephones connected parallel through a single telephone line. When any one of the telephone is lifted,the relay with stands with connection and current passes and makes the IC OptoCoupler MCT23,and o/p is fed to a programmable microcontroller of 8051 family ,and send a signal to display which telephone line is lifted is displayed in a 7 Segment display, while other telephones will be tripped off by making relays offs with help of a Relay Driver IC(ULN2003). This Project can be used in houses and offices where more than one telephone is connected in parallel through a single telephone line. This can be achieved in both incoming and out going calls. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 22 Mar 2012
  • 399
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Model no: 76 The main aim of the project is to acquire the real time data acquisition with a impact of supervisory control for large scale Remote Industrial Environment. For this real-time scenario we are taking a temperature logging System for an remote plant operation. Here 8 analog temperature sensors in multiplexing mode are connected to a programmable microcontroller of 8051 family through a IC ADC 0808. Then the values of all the sensors are sent serially by MC through Max 32 IC to the Computer. Software “DAQ System” loaded on the Computer takes these values and shows them on its front panel, and also logs them to the data base "daq.mdb". One can set by interactive way some parameters like set point, low limit, and high limit on the computer screen. When temperature of some sensors increases beyond set point, the microcontroller sends commands to relay driver IC ULN2003. The heaters (lamps in the test board) connected through relay contacts are (specific for that sensor) turned OFF (or ON in opposite case). High limit and low limits are for generating an alarm in the event of system failure. When temperature goes above high limit or low limit the alarm is going to blow a sound. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 22 Mar 2012
  • 532
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Model no: 59 Power factor is defined as the ratio of real power to apparent power, where real power is the time integral of the instantaneous power measured over a full period and the apparent power is simply the product of the RMS voltage and RMS current measured over the entire period. The time lag between the zero voltage pulse and zero current pulse duly generated by suitable operational amplifier circuits in comparator mode are fed to two interrupt pins of the microcontroller where the program takes over to actuate appropriate number of relays at its output for bringing shunt capacitors into the load circuit to get the power factor till it reaches 0.95. The microcontroller used in the project is of 8051 family which is of 8 bit. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.
  • 21 Mar 2012
  • 388
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Model no: 48 The project takes care of reminder need of people who forget to take medicines in time. Keypad entry stores the relevant information with several timings based on a RTC (Real Time Clock) IC. At the programmed time the message for the medicine is displayed over a 16 digit LCD display together with a buzzer sound to alert the person for taking the appropriate medicine. The microcontroller used in the project is of 8051 family which is of 8 bit. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 21 Mar 2012
  • 641
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Model no: 40 The main scope of project is to send message from any tampered energy meter to be received by the control room by RF communication. The receiving signals are then fed to a microcontroller, programmed to recognize those tampered meters to provide a display at the control room with buzzer sound each time it is tampered. The project consist of the IR transmitter which is used to transmit the IR signals here we are using the photodiode IR receiver. In project shows that if any tampering is going on with energy meters it gives the signal to microcontroller through photodiode. Microcontroller gives the output that signal is given to the encoder and this transmitted through the RF module. At the receiver side it consists of decoder and the decoded signal is given to the microcontroller and that used to display the message. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
  • 21 Mar 2012
  • 511
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