Final Year IEEE Projects for BE, B.Tech, ME, M.Tech,M.Sc, MCA & Diploma Students latest Java, .Net, Matlab, NS2, Android, Embedded,Mechanical, Robtics, VLSI, Power Electronics, IEEE projects are given absolutely complete working product and document providing with real time Software & Embedded training......
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Real time car battery monitoring and low voltage alert system
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REAL TIME CAR BATTERY MONITERING AND LOW
VOLTAGE ALERT SYSTEM
ABSTRACT
This project is designed to know the voltage level of a battery from the number of LED’s that
are glowing. It uses ten LEDs in all. So if three LEDs glow, it indicates battery capacity of 30
per cent. Unlike in mobile phones where the battery-level indicator function is integrated with
other functions. This project uses ten comparators, which are internally assembled in the
voltage divider network based on the current-division rule. So it divides the battery level into
ten parts. The circuit derives the power supply for its operation from the battery of the device
itself. It uses ten LEDs wired in a 10-dot mode. The use of different color LEDs makes it
easier to recognize the voltage level on the basis of the calibration made.
Red LEDs indicate battery capacity of less than 40 per cent. Orange LEDs indicate battery
capacity of 40 to less than 70 percent and green LEDs indicate battery capacity of 70 to fewer
than 100 percent. The brightness of the LEDs can be adjusted by varying the value of preset.
Diode is used to prevent the circuit from reverse-polarity battery connection. The tenth LED
glows only when the battery capacity is full, i.e., the battery is fully charged. When the
battery is fully charged, relay-driver transistor T1 conducts to energies relay RL1. This stops
the charging through normally-open (N/O) contacts of relay.
For calibration, connect 15V variable, regulated power supply and initially set it at 3V.
Slowly adjust VR1 until LED1 glows. This project uses regulated 12V, 750mA power supply
for charging the battery. 7812 three terminal voltage regulator is used for voltage regulation.
Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/18V step
down transformer.
