I am currently working on a project which involves the regular recording of data on a memory card. Since I never did that, I had to do various tests. One of these tests involves recording a temperature, just to get my hands on it and validate the concept.
Maybe it might interest someone. I present the thing to you "as is", it is a prototype, the software must be far from being free of bugs, but it is functional.
The principle is simple: record the temperature measured once per second using a DS18B20 digital probe
The recording is done on a 32MB to 2GB SDcard (currently tested with a 1GB) formatted in FAT16 in the form of a .CSV file that can be directly opened with Excel or similar spreadsheet.
Registration takes around 2.5MB per day and is limited only by the capacity of the card used.
The editing does not manage the time or the date, it just counts the time by setting off its power, displays it in the form of HH: MM: SS and drops to 0 every 24 hours
The use is very simple.
We feed it with a 5V DC source and recording starts immediately (as long as an SDcard is present)
An LED indicates the recording in progress.
You can stop or resume recording with a button.
Do not remove the card or cut off the power while the LED is on, otherwise you will end up with a corrupt file.
The file is saved once a minute.
If it interests people, I would give more details. In the meantime I just give you the diagram and the .hex file to download from the µC PIC
https://www.econologie.info/share/partag ... ottVeU.mp3
NB: The MP3 file must be renamed to .ZIP, it is an archive containing the .HEX file
