It is used to indicate whether the power of a single lithium battery (4.2) is insufficient when the power of the lithium battery does not need to be accurately known.
Low cost, easily available components, and ultra-small size.
Connect the module directly to the lithium battery. When the lithium battery voltage is low, the LED light will light up.
The low battery threshold voltage is adjustable, and according to the current schematic, it is about 3.3V. The specific calculation formula is: target voltage = 2.5 / R3 * (R2+R3)
Ultra-low power consumption, when the LED light is not on, the power consumption is less than 1 mA. Therefore, this module can always be connected to the lithium battery without worrying about consuming the power of the lithium battery.
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