![]() ![]() ![]() $$ \frac \$ of 3.3V.Ĭonsider using two comparators so you can have two thresholds if you use single package with two comparators this hardly takes up more space. If I understood you correctly, you want the LED to turn on for battery voltages lower than 3.3V (V_th) that means you calculate The LoBat Low Battery Indicator for Active Insturments Notifies the player of low voltage before tone suffers Super low current draw will not reduce battery. You can determine the value of the voltage divider by considering that the voltage at the negative input needs to be the same as the threshold voltage (at the positive input). On top of viewing the level in navigator the driver supports low level events along with automated push and email notifications. There are also different types of comparator outputs, perhaps you need to drive the LED differently. Make sure to calculate the values for your specific design. Simulate this circuit – Schematic created using CircuitLab ![]() If not, you need to build a small circuit that produces a voltage independent of the battery voltage: The easiest solution is to utilize a zener diode in reverse bias (and a current limiting resistor.) The image is meant to invoke the low fuel warning. If that is the case, you can use this as the threshold voltage and simply scale down the battery voltage accordingly. This warning light comes on when the available power in an electric vehicles (EVs) primary battery runs low. battery indicators Share this: Tweet Share More This is a very simple 9V low battery indicator circuit which has 2 LEDs, one green which will light up when the battery voltage is higher than 6. A regulator is a good, simple idea especially if you already have a regulated voltage (buck converter or similar) present. ![]()
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