S
Si Ballenger
- Jan 1, 1970
- 0
Is there a "simple" way to read a digital multimeter readout via
the parallel port? I'm wondering if the below harbor freight
multimeter (below link) can be hacked to get the reading from the
LCD display. Being as cheap as they are (I've got a couple and
they actually work), I'd like to see if they could be turned into
a data supplying gizmo to a pc. I notice that each character in
the LCD looks like it would be seven seperate on/off circuits,
and each probably could be read seperately with the appropriate
interface. Is there a simple amp type chip that could take the
on/off voltage/signal supplied to the LCD and output to control
an npn transistor on/off (I suspect the current to the LCD is
very small)? The parallel port is probably pretty heavy duty ma
wise compared to the chip in the multimeter. I've made me a
little gizmo using diodes, resistors, transistors, and qbasic
that reads external contact status using the parallel port
(bottom link), and would like to expand this to be able to get
actual data from the multimeter. Thanks fo any info!
http://tinyurl.com/g1lf
http://zoomkat.d2g.com:88/cgi/status.bat
the parallel port? I'm wondering if the below harbor freight
multimeter (below link) can be hacked to get the reading from the
LCD display. Being as cheap as they are (I've got a couple and
they actually work), I'd like to see if they could be turned into
a data supplying gizmo to a pc. I notice that each character in
the LCD looks like it would be seven seperate on/off circuits,
and each probably could be read seperately with the appropriate
interface. Is there a simple amp type chip that could take the
on/off voltage/signal supplied to the LCD and output to control
an npn transistor on/off (I suspect the current to the LCD is
very small)? The parallel port is probably pretty heavy duty ma
wise compared to the chip in the multimeter. I've made me a
little gizmo using diodes, resistors, transistors, and qbasic
that reads external contact status using the parallel port
(bottom link), and would like to expand this to be able to get
actual data from the multimeter. Thanks fo any info!
http://tinyurl.com/g1lf
http://zoomkat.d2g.com:88/cgi/status.bat