ChiefRunningPhist
Well-Known Member
Thanks, and that sounds like an efficient project! I've since realized I can condense much of the data set and have started to design with JS. We'll see how it goes lolYou can add an sd card really easily with only a few resistors dividers to change the 5v to 3v and a zener diode to provide a 3.3v supply. 4MB should be fine if you just store the data you need and generate the table on the fly (see below). It also might be easier to just store the data you need rather than the whole chart; in my app a weeks worth of temp and humidity measurements from one sensor with one point for every five minutes takes up less than 4kB.
HTML is static content, to display dynamic content you would probably need java, javascript, or maybe php. If you really want to store the whole chart then you could run a php server and use prebuilt libraries to just display the chart. Your code would only really consist of adding data to the file. Alternatively you could just provide the data and let the user display it (through a static web page with javascript - I think javascript would be enough for your purposes).
I have used appinventor in the past to create low/no effort android apps, but a web page is more flexible.
It's just backup. If there's a brownout or some sort of program crash then the fans keep running and the lights stay on/off as required. (edit: see TimeZone's comment about the pi hanging sometimes) Basically I just want to move two clicky timers, three switches, two potentiometers, three thermometers (12 aaa batteries a year!) and one fan controller all to one box. Having it be able to adjust settings for me is icing on the cake.
Referencing this video on the procedure.
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