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Std edition Battery Indicator Common Cathode Bi-Color LED
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License: Public Domain
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.
design drawing
schematic diagram
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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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