LED Voltmeter (for portable QRP ops)

As the summer is already here (HI), I plan to spend some time on YOFF and SOTA-YO so I prepare my portable backpack.
A portable and compact voltmeter is often nedeed but the usual multimeters are bulky, impractical and heavy (for portable use).
Therefore, I made a little voltmeter, which shows the SLA battery voltage via a blinking LED.
I made it around a PIC 16F876A microcontroller using the embedded ADC.
All can be made on a perfoboard as a Do It Yourself (DiY) Project for a raini afternoon.

Here is the schematic diagram (CLICK to enlarge):

The LED shows the following voltages;

Ind.	Volt	Collour
LED 1	< 11 V	Bright RED
LED 2	11 V - 12 V	RED
LED 3	12 V - 12,4 V	YELLOW
LED 4	12,4 V - 12,6 V	GREEN
LED 5	12,6 V - 13 V	GREEN
LED 6	13 V - 13,3 V	GREEN
LED 7	13,3 V - 13,8 V	YELLOW
LED 8	>13,8 V	Bright RED

Al the nedeed files are .rar archived and available for download HERE.

Here is a little movie with the voltmeter:



If you found this usefull, please drop a line!

73 de YO3HJV

PS
A explanatory article was published into the QRP Quarterly (Spring 2012) 
-Page 1
-Page 2 

Here is another link to download QRP Quarterly with SLA PIC Voltmeter.