Does your digi have a serial port? Can you send and receive data in and out?
Maybe this might work...
http://www.linuxtoys.org/dvm/dvm.html
or this...
http://www.viddata.com/dvm_hardware.htm
or this...
http://www.rs232pro.com/rs232/rs232_dvm_kit.htm
Mike WA6ILQ
At 02:42 PM 01/30/10, you
If you made a simple voltage divider that would give you around 12VDc
from the 148VDC power plant you could use a circuit like this to watch
the voltage change:
http://dev.emcelettronica.com/howto-monitor-lead-acid-batteries-charge
The LM3914 would give you high/low outputs at the LED lights
Chuck Kimball n0...@... wrote:
Speaking of monitoring
Anyone have an easy way of converting a Positive
Ground 48 to 72 volt system to a Negative Ground
0-5V for monitoring?
Do you want the voltage to vary with change in the 48 to
72 volt dc supply?
s.
Yes, trying to monitor the local -48 Power system, and solar charging
system with my APRS digi +12VDC that accepts 0-5VDC input.
Chuck
skipp025 wrote:
Chuck Kimball n0...@... wrote:
Speaking of monitoring
Anyone have an easy way of converting a Positive
Ground 48 to 72 volt system to a
At 02:42 PM 1/30/2010, Chuck Kimball wrote:
Yes, trying to monitor the local -48 Power system, and solar
charging system with my APRS digi +12VDC that accepts 0-5VDC input.
You need a DC-DC converter. This should help you get started
http://www.maxim-ic.com/app-notes/index.mvp/id/2031
Chuck Kimball wrote:
Yes, trying to monitor the local -48 Power system, and solar charging
system with my APRS digi +12VDC that accepts 0-5VDC input.
Chuck
Probably the simplest would be to use an opamp as a X 0.1 inverting
amplifier:
10K
How about a Optoisolator? Like a 4N25, I'd use a 47K resistor on the
LED side and play with the resistor value on either side to get the
readings right, but its what they do in switch mode supplies to make
the DC side talk to the AC control circuits.
Chuck Kimball n0...@... wrote:
Yes, trying to monitor the local -48 Power system, and
solar charging system with my APRS digi +12VDC that accepts
0-5VDC input.
Chuck
The next part is how much resolution and accuracy do you want?
There are a number of ways to fudge fixed step reporting
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