![]() ![]() ![]() 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 coloured leds representation of battery life will be made easy to understand. ![]() We can have coloured lods 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. To avoid this condition, R5 is added to provide some hysteresis around the trip point. The cycle repeats itself and oscillation occurs. To adjust the voltage level at which you want the indication we have used a 10K ohms variable resistor. The frequency of the 555 timer is set by a combination of resistor and capacitor at its input pin. It uses a LM3914 driver IC use to drive 10 leds by passing through it sufficient amount of current. The output of U1 will then switch low, reconnecting the load to the battery and causing the battery voltage to drop below 3.0V again. Low Battery Indicator Circuit Working Explanation This circuit is built around the 555 timer IC that is wired as a comparator. This circuit utilize zener diodes as a voltage reference and 741 op amp as voltage comparator to detect if the voltage falls below a preset value. This battery indicator circuit will indicate the low battery condition by flashing the LED. We can easily recognize the battery level with the help of LED’s. A low-battery indicator circuit is shown in the schematic diagram. Battery level indicator is a circuit that is used to check the battery life. ![]()
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