On Wed, 4 Feb 2026 09:06:46 +0000 Chris Green <[email protected]> wrote: > I'm looking for a program to do simple chart plotting, e.g. I have > some voltage measurements taken (say) once a minute and I want to > display how the voltage varies over (say) a day. So that's 1440 > measurements. > > This can be web or desktop, all I want is a window with a line drawn > across it really, a scale would be handy and the ability to show more > than one plot (e.g. voltage and current maybe). > > Source of data will almost certainly be a database as the data will be > coming from a headless Raspberry Pi and I already have that set up > writing values to a sqlite3 database. Obviously I can change the data > format, it is pretty simple to change it to CSV or whatever. > > Searching the main Debian repositories has brought up very little, > just a couple of libraries but no actual, runnable, programs. > > Can anyone suggest anything that will do what I want? >
Doubtful, I think most people would use a spreadsheet for doing that kind of thing. The actual application will vary so much I suspect there won't be much beyond libraries, with people writing their own front ends and parameter supply. I made such a thing for display of the last week's temperature and humidity numbers, using an ImagickDraw object in PHP on my web server. It was some years ago now, and I presume I wasn't able to find anything ready-made either, nor a useful library. It's about a 7.2k PHP source file, so not completely trivial but not too difficult. -- Joe
