Results for: do-it-yourself-concept Search Results
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2:38
High Intensity Discharge lamps (HID) used for urban street light are based on principle of gas discharge, thus the intensity is not controllable by any voltage reduction method as the discharge path is broken. In this project White Light Emitting Diode (LED) replaces the HID lamps where intensity control is possible by Pulse Width Modulation (PWM). The intensity control helps in saving energy at late nights during which the traffic density is low. A programmable microcontroller from 8051 family is engaged to provide different intensities at the different times of late night for energy saving. The intensity gradually decreases from full intensity and then finally OFF. 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 *******efxkits****; *******www.facebook****/edgefx
2 Mar 2012
752
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1:15
This project is engaged to provide flashing lamp simulating a beacon light generally used in shipyards. It is also used in middle of the sea with hidden rocks for warning system. A programmable microcontroller from 8051 family is engaged to provide different intensities at the different times. A low voltage lamp of 12V is driven by a power MOSFET in PWM mode drive which is derived from a microcontroller. The duty cycle of the PWM increases progressively and decreases in certain time interval. Thus the intensity gradually decreases from full intensity to OFF and this process repeats. 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 *******efxkits****; *******www.facebook****/edgefx
2 Mar 2012
883
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0:56
Model no:1B This project is engaged for industrial drafting fan for applications like textile mills, chocolate factory, and wire drawing units. A programmable microcontroller from 8051 family is engaged to provide different speed at different times. A low voltage BLDC motor is driven by a power MOSFET in PWM mode drive which is derived from a microcontroller. The duty cycle of the PWM increases progressively in steps. 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 *******efxkits****; *******www.facebook****/edgefx
2 Mar 2012
667
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1:35
Model no: 2 The aim of this project is control the speed of DC motor. The speed of DC motor is directly proportional to the DC voltage applied across its terminals. Hence, if we control the voltage applied across its terminal, we actually can control its speed. Here we use microcontroller from 8051 family. Two buttons are used as inputs to control the speed of motor. PWM is generated at the output by using program burned into the microcontroller. The program can be written in Assembly language or in Embedded C. PWM (Pulse Width Modulation) wave can be used to control the speed of the motor. Here the average voltage given or the average current flowing through the motor will change depending on the ON and OFF time of the pulses controlling the speed of the motor i.e. The duty cycle of the wave controls its speed. On changing the duty cycle (ON time), we can change the speed. The motor is interfaced to the microcontroller by an IC called motor driver IC i.e., L293D. By interchanging output ports, it will effectively change direction of the motor. 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 Mar 2012
620
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0:59
Model no: 2A The aim of this project is control the intensity of lamp. The intensity of lamp is directly proportional to the DC voltage applied across its terminals. Hence, if we control the voltage applied across its terminal, we actually can vary the intensity. Here we use microcontroller from 8051 family. Two buttons are used as inputs to vary the intensity. PWM is generated at the output by using program burned into the microcontroller. The program can be written in Assembly language or in Embedded C. PWM (Pulse Width Modulation) wave can be used to vary the intensity. Here the average voltage given or the average current flowing through the lamp will change depending on the ON and OFF time of the pulses controlling the intensity of the lamp i.e. The duty cycle of the wave controls its intensity. 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 voltage regulator 7805 which is required for the operation of microcontroller and other components. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
2 Mar 2012
644
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1:46
model no: 3A The outline of the project is selection of supply from mains, generator, and inverter and solar automatically by using microcontroller concept. As it is not feasible to provide all 4 different sources of supply, one source with alternate switches are provided to get the same function. In this project we are having 4 switches which we consider as 4 different source of supply. When we press any of the switches it shows the absence of that particular source which is connected to microcontroller as input signals. Here we are using 8051 family microcontroller. The output of microcontroller is given to the ULN2003 this acts as a relay driver. This can drive up to 7 relays. The relays which are used hear are 12V relay. The output can be observed using a fan which is getting uninterrupted power supply from other means if main supply is cut off. 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 Mar 2012
425
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1:18
Model no: 6A The project is based on the principle of firing angle delay of thyristors using back to back SCR’s in series with the load with control being fed from a microcontroller via opto isolators. The firing angle would be adjusted to maintain the load power by rising and decreasing slowly the intensity of the lamp load, resembling the situation of a flasher for aviation obstruction light used in tall buildings. The above operation can also be carried out by using a TRIAC in series with the load. The project is having comparator which is used for ZVR output. The ZVR is given as reference interrupt to microcontroller. The microcontroller is of 8051 family which is of 8bit. In this we are using switch which is used for increasing the firing angle. The optisolator used in the project is used as switching element using this we will trigger the back to back SCR. On the base of SCR triggering the intensity of the AC lamp can be controlled. 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 Mar 2012
689
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1:22
Model no: 7 Incandescent lamps exhibit very low resistance in cold condition. Thus at the time of switching from cold state it draws very high current. Thus many lamps fail at the time of switch ON. Engaging two SCR’s in anti parallel or a TRIAC the switching ON time can be precisely controlled by firing after detecting the zero cross point of the waveform of supply voltage. This should result in current waveform rising from zero at the time of switching ON there by increasing the life of lamp. The project is having comparator which is used for ZVS output. The ZVS(ZERO VOLTAGE START ) is given as reference interrupt to microcontroller. The microcontroller is of 8051 family which is of 8bit. In this we are using push button as switch which is used as reference interrupt to microcontroller and using that interrupt we give signal to optoisolator . The optoisolator used in the project is used as switching element using this we will trigger the back to back SCR. On the base of SCR triggering the AC lamp can be controlled to ON at low voltage. 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 Mar 2012
560
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1:17
Model no : 11 The outline of the project is to shut down the power supply when it is overloaded. Conventional circuit breaker is based on thermal bimetal lever trip mechanism, which is very slow and the trip time is dependant upon the percentage of overload. So, Electronic circuit breaker is designed which is based on the voltage drop across a series element typically a low value resistor or a CT (current Transformer). The voltage sensed is compared against the preset voltage proportional to the current by a level comparator to generate an output for the Relay or contactor to trip the load. The unit is extremely fast and overcomes the drawback of the thermal type. It uses an 8-bit microcontroller from 8051 family into which program is burned for the operation of this project. 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 Mar 2012
885
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1:09
Model no: 12A This project is designed to operate a garage door remotely by laser beam. The circuit comprises of a laser beam sensor built using op-amp IC LM358. Op-amp’s are configured here as a comparator. The Microcontroller used is 8-bit, 40 pin from 8051 family. It is used to control the whole system by monitoring the sensors and when the laser sensor receives the signals then the microcontroller will send command to relay driver IC the contacts of which are used to switch on the motor used for opening the garage door and it will switch off the motor after predetermined time. The status of the door whether it is open or closed is displayed on the 16X2 LCD interfaced with the 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
3 Mar 2012
584
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1:03
Model no : 13 Star/Delta starters are probably the most common reduced voltage starters in the 50Hz industrial motor world (Known as Wye / Delta starters in the 60Hz USA world). They are used in an attempt to reduce the start current applied to the motor during start as a means of reducing the disturbances and interference on the electrical supply. The Star/Delta starter is generally manufactured from three contactors; an electromechanical timer and a thermal overload for operating a 3 phase motor at 440 volt at ac mains supply 50 Hz. The interlocking arrangement of all the contactor coils is traditionally wired in 440 volt ac. However in our project we have taken up the same to operate a 3 phase motor at 440 volt ac mains supply 50 Hz with a set of 12 volt DC relays, an electronically adjustable timer and a set of miniature circuit breakers. The interlocking arrangement of the relay coils and the electronic timer are all wired in low voltage dc of 12 volt fed from an inbuilt dc power supply for safe handling of the starter during the study, still retaining its is application for a 3 phase motor starting with single phasing prevention .as the project would be expensive in using a 3 phase induction motor the project shall be tested with a set of lamps for each phase . during star operation the lamps would glow dim indicating the supply voltage across the coils are 440/sqrt(3) and while in delta condition after the timer operates the lamps would glow with full intensity indicating full supply voltage of 440volts. The timer comprises of a 555 in mono-stable mode the output of which is fed to a relay for changing the mains supply from 3 phase star to delta. The project also has the provision of single phasing protection since 3 phase motors get burnt if any one phase goes missing during running. The output to the lamps shall be completely cutoff in the event of any phase failure. For more info visit *******www.efxkits****; *******www.facebook****/edgefx
3 Mar 2012
1628
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1:23
The main motto of the project is to drive an Induction Motor for the required application in forward direction and reverse direction with Wireless technology. In this project thesis, we are pressing a button from a TV remote which acts a transmitter and send signal to and it is received by a component called IR receiver, the output is fed to a programmable microcontroller from 8051 family, is engaged to actuate the Induction Motor to rotate in forward and reverse direction with help of relays which is driven by an IC ULN2003 (relay driver). 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
3 Mar 2012
906
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