INVERTER WITH BATTERY LOW AND OVER LOAD INDICATOR

Inverters become a necessary device for a common man. Especially, in summer, the power shortage is more. We To overcome from the difficulties caused by power shortage by using inverters. This project is designed for 45W load. This project uses SG524 IC for SMPS control and LM339 to detect the over load, inverter on, charging on and battery low conditions. CFL loads are suggested for this project, as they consume low power and produce high intensity of lighting. These inverters play vital role especially in rural areas. A rechargeable 12V battery is used to store the energy during power availability. The back up time depends on the battery ampere – hour rating. This inverter can show the battery low condition and Over load conditions by 5mm LED indicator circuit. This project uses regulated 5V, 750mA power supply for microcontroller unit. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.

BLOCK DIAGRAM 

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Active Phase Selector for Single Phase Load from 3 Phase Supply

ABSTRACT:  Phase absence is a very common and severe problem in any industry, home or office. Many times one or two phases may not be live in three phase supply. Because of this, many times, some electrical appliances will be on in one room and OFF in another room. This creates a big disturbance to our routine work.  This project is designed to check the availability of any live phase, and the load will be connected to the particular live phase only. Even a single phase is available, and then also, the load will be in ON condition.  This project is designed with AT89S52 MCU. This controller continuously checks for live condition of all phases connected to it, and the controller connects the load to the active phase using a Relay. This relay is driven with a transistor.  If two or three phases are live, the load will be connected to phase I only. An LCD is provided to display the status of the phase condition. Contrast control preset is given for LCD contrast control.  This project uses regulated 12V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer

Block Diagram :

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HIGH SENSITIVITY INTELLIGENT BLIND STICK

        Now-a-days many accidents occur due to intense traffic. It is very difficult for blind people for path finding without others help. This project helps to facilitate blind people in path clearing assistance and obstacle detection.  In this project we are using an IR transmitter and Receiver circuit based path clearing assist cap. Path clearing assist cap is used to detect any obstacles. If any obstacle is found, the IR light will be reflected back and sensed by IR receiver and sends a signal to the buzzer driver circuit, which produces buzzer sound near hand.  This projects works very well even in night and day timings, irrespective of the lighting intensity. This project is reliable and effective. This project uses regulated 5V, 750mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer. This project can be powered by a simple 9V battery also for portability.

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Auto mute for car audio deck

(Automatically Mute Your Car Audio System when you receive a call)

 Muting car’s audio deck, while talking on cell phone is an important yet difficult task. This project is designed to solve the problem. A sensitive IR transmitter and receiver pair is designed and fixed to a cell phone holder. Always the cell phone should be placed in the holder.  The transmitter unit continuously transmits IR rays. These IR rays are interrupted by the cell phone. Whenever the cell phone is lifted from the holder, the IR rays fall on the receiver and it sends a signal to switching circuit. A relay is driven by a relay driver circuit and the relay opens the deck speaker wires and the audio will be muted.  After the completion of the conservation, the cell phone should be kept back in the holder. Again the IR rays will be interrupted and the relay will be de-energized. Music will be played again normally.  This project uses regulated 12V, 750mA power supply. 7812 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/18V step down transformer. 

Block Diagram    :

 

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