Also if you can go with serial, there are loads of cheap digital
voltmeters with serial interfaces. A while back I got a bunch of Metex
ME-11 meters for our workshop, which have a DB9 connector. They come
with windows/DOS software but I suspect the interface is reasonably
universal (or at least
+1
for ~US$40-50 you should be able to get a usb adapter and a couple of
sensor IC's to play with.
Never measured the voltage of something but the hobby boards
temp/solar/humidity uses it for the humidity part (differential voltage
I believe). man owsbm. The DS2438 it supports should be
With a proto board and some skills, you could build a serial system with
a total cost around US$30, small enough to not even need a rail support.
You could also try to hang on the I2C iface of your mainboard and add
you own devices, but if you're not so much into electronics... Go the
Arduino
On Thu, 28 Jan 2010 22:28:45 -0800 Raymond Lillard rlill...@sonic.net
wrote:
Ralph Becker-Szendy wrote:
For one of my OpenBSD machines, I need to be able to measure a few
analog voltages, and act on them in a control process. The
requirements are quite simple compared to typical data
OpenBSD has a driver for the Dallas OneWire protocol.
man(4) onewire
Dallas make adapters for USB and RS232, such as the DS9490R - google
can find you a supplier,
for example:
http://www.hobby-boards.com/catalog/product_info.php?products_id=1503
There are all manner of 1wire chips avalable -
Ralph Becker-Szendy wrote:
For one of my OpenBSD machines, I need to be able to measure a few
analog voltages, and act on them in a control process. The requirements
are quite simple compared to typical data acquisition: I absolutely
need two voltage inputs, either 0-20V or 0-100mV; doesn't
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