On 5/9/22 05:38, andy pugh wrote:
In the application you describe I would rather expect the USB to act
as a battery replacement. Though USB is 5V and the reader heads use a
1.5V battery, so this might be a dangerous assumption.
<finds caliper with missing battery cover>
The scales can be powered through the data cable. This would be
useful in many fixed installations.
However, they do not like 5V. I experimented and things went wrong (no
smoke, but all LCD elements turned on) at 2.1V.
So, don't plug the USB into a USB socket without doing some careful
tests with a current-limited variable power supply first.
This probably isn't relevant to this query, but there are 3D-printable
connector designs: https://www.thingiverse.com/thing:2477494 as an
example.
In a bit of a coincidence, CTC just spammed me with an email informing
me that they have 50% off digital scales, code DS2022
https://www.ctctools.biz/digital-scales-dro/
No worries. The DRO puts out 1.5VDC through the Vpos and Vneg lines.
I'm not plugging the scale into a PC or anything like that. The scale
is plugged into the DRO-350. All I'm trying to do is cobble a cable to
go from the DRO to new scale which has the mini USB connector on it
rather than the old four strip connector in it. I'm figuring the mini
USB will probably be a much better connection than the old one could
ever be.
Mark
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