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.
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