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Std EditionBattery Indicator Common Cathode Bi-Color LED

License: Public Domain

Published Time:2018-01-03 02:16:31
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Description

This is a battery capacity indicator for 3.7V lithium ion batteries, using a bi-color LED (red-green) common cathode.

When the battery is from 100% to 50%, the LED stays green. When the capacity is from 50% to 20%, both LEDs turn on so it shows as yellow. When battery drops below 20% the green LED turns off leaving the red LED turned on.

It uses a schmitt trigger for both LEDs to prevent bouncing on the threshold. I accomplish this with a dual op-amp.

I design this to work with 5V, not only to power everything, but also to have a reference voltage to measure the battery voltage.

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Common Cathode

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Common Cathode

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ID Name Designator Footprint Quantity
1 6k2 R1 AXIAL-0.3 1
2 2k2 R2 AXIAL-0.3 1
3 NE5532P U1 DIP8 1
4 +5V +5V 1X01-CLEANBIG 1
5 GND GND 1X01-CLEANBIG 1
6 +BAT +BAT 1X01-CLEANBIG 1
7 51k R3 AXIAL-0.3 1
8 2k R4,R10 AXIAL-0.3 2
9 6k8 R5 AXIAL-0.3 1
10 2k7 R6 AXIAL-0.3 1
11 S8050 Q1 TO-92(TO-92-3) 1
12 100k R7 AXIAL-0.3 1
13 100 R8 AXIAL-0.3 1
14 5k1 R9 AXIAL-0.3 1
15 BI_LED D1 LED2X3.0MM 1

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