V 1f input voltage is higher than the calibrated voltage, for full scale input error will be shown. V In case of voltage matching, correct level wouldn’t be indicated V Minimized version of this circuit can be also used for automobiles to indicate the battery level and low cost. This circuit connected to inverter can help the users to know when to charge and when to leave the inverter idle V This circuit can be used in household applications like INVERTER. V Enhanced version of this circuitry is the present mobile phone battery level indication system And if 10 LED’s glow then it is 100 percent. V It is used to check the battery level with the help of LED’s for example if three LED’s, indicates battery capacity of 30 percent. V Indicator indicates how much power the battery will be able to supply to electronic apparatus. V A battery level indicator is with electronic appliances to arrange as to display, on an indicator, a real time voltage detected by voltage indicator. Thus our battery level indicator can be used for decoration purpose also. Since AC voltage having continuously varying amplitudes the leds will turn ON and OFF continuously making a good looking pattern. Since only DC input voltage levels are indicated, components which work in AC supply can be used to detect AC levels. The current through the leds is controlled by the internal adjustment.Ģ The battery level indicator consists of very less component and thus occupies very little space of the surrounding. Any dc signal lying in the range of the power supply is judged and the level is indicated by the leds. Reference voltage is pre decided which is 1.25mV. Power supply is ranging around 12 to 18V. Leds will glow according to the input given and the reference Input present. A reference input for comparison purpose. We will have a led block and an input block. In the below given block diagram we have 4 blocks. Cascading the driver ICs we can increase the range of battery input in terms of voltage. Thus by using various colouredleds representation of battery life will be made easy to understand. We can have colouredlods to indicate state of the batteries like first three leds will indicate low battery. Since the driver IC has two modes of operation which is bar graph mode and dot mode, it enables us to have indication of the battery life either in bar form or in dot form. A variable resistor is also deployed in the circuit to have variable input voltage at pin 5 of the driver IC. Brightness of leds are controlled by reference adjustable pin and reference out pin. It uses a LM3914 driver IC use to drive 10 leds by passing through it sufficient amount of current. We can easily recognize the battery level with the help of LED’s. A better way to handle batteries to conserve capacity has also been highlighted.īattery level indicator is a circuit that is used to check the battery life. The results gathered during testing point to possible reduced battery wastage. The system is expected to help in planning with batteries to avoid halt of devices during operation. The project goal was achieved and results were presented through numeric figures, charts and indicators. The project uses a LM3914 driver IC use to drive 10 leds by passing through it sufficient amount of current. Software design then followed, after which testing was performed. System implementation involved designing and building a battery charger circuit and a discharge circuit. However, since the principle behind the rechargeable battery technology is similar, the system can be used to test other types of batteries. The Nickel Metal Hydride battery was selected in this project due to its preference among consumers. This project aimed at building a system that would indicate the capacity level of a Nickel Metal Hydride battery upon charging and discharging. Just like primary cells, rechargeable batteries work in the same way, only their chemical reactions are reversible. Technology on batteries has advanced over the years as a result of the need to power portable devices that have risen in numbers in the last decade.
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