[youtube]0JEo1_XCJJ4[/youtube] This small circuit is of great value to check you car battery status. [i](enclosure not included!)[/i]
Features:

1. easy to build in
2. only 2 wires to connect (connect after ignition)
3. uses multi colour 3mm LED
   1. green: battery OK
   2. Slow pulsing (green): battery OK or charging
   3. red: battery voltage is low
   4. red blinking: battery is being overcharged
4. includes: board to wire connector

Specifications:

1. dimensions: 30x20mm / 1.18 x 0.78" (board)
2. Voltage thresholds are (+/- 2%):
   1. RED: 5-10.9V battery low
   2. GREEN: 11 - 13.2V battery OK
   3. GREEN GLOW: 13.3 - 17.7V battery charging
   4. RED BLINK: 15.8 + battery NG or overcharging

datasheet_mk189-uk.pdf

manual_wsaa189.pdf

module_diy_kit_guide.pdf