An interesting extract from a forum : "The insane sounding lengths like 10, 25, and 100m are perfectly possible, and I use the method often (with UART not I2C, but the method stands) when I need to

I forgot to join a picture :

Goodnews !!! I opened OCS web page from another computer in my home and Weather chart is OK !!!! software is Firefox on both computers... I will clear the cache tomorrow morning on the "faulty"

Now... did you ever clear the browser cache? This is specifically designed so the OCS doesn't need to send that big file every time a page is loaded, so a bad copy in the web browser cache can keep it

I2C rates? See Weather.ino near the bottom... // slow down i2c so long distances work, still plenty fast for our little data being moved around Wire.setClock(20000);

Oh yes it does have content, I see 225K size is present. It's all spaces " " and data is positioned by line OCS is writing the file and SD is working. Btw: Size = exactly 80 bytes per line x 2

That's longer than I'd ever consider using. Google it.

I have run the following sketch to test the SD card communication (copied from internet) : #include <SPI.h> #include <SD.h> File myFile; String buffer; String filename = "test"; void setup() {

I have inserted another SD card (8 Gb reformatted) with Chart.js placed in the root directory, but no change : Weather charts are empty. New : I now have a file written on the SD Card : But if I open

The length of the I2C cable is more around 30 m...

I have inserted a 16 Gb SD card. May be it is to much ? Up to now, no file is written on the SD card, which only contains Chart.js. Also what is the maximum length of cable for the i2c bus ? Can the

Check the SD card contents to see that the log files are being written. They are plain text files, you can open them in notepad on a PC. Read up on the Arduino SD card support, what works and what

A statement like this: Leads me to think you were implying the relay state could impact stability.

Good morning, Status of this morning : There are still reboots, even with the the relays HIGH (i.e. no 220 V AC current transiting the output terminals of the relay). Let me make it clearer :

If you're saying switching mains (or even the act of switching relays) is crashing the system go back to my first post in reply to this. Interference: EMI RF Back EMF.(flyback from relay coils.) High

When the relays are HIGH (220 V AC in Open Circuit at the relay ouput terminals) the system is stable : no reboot in more than 88 minutes). See screen copy : I let it in this state for the night and

What about that I2C bus... Bus and all sensors are 5V rated/compatible? Level translation for 3V3? Loading resistors? Twisted pair? How long?

I would tackle problems one at a time... Get the rain sensor working first, that should be a basic device right?

Or perhaps corrupt signaling on the I2C bus locks up the (Arduino) Wire library.

The OCS reads the "Chart.js" file and sends it to your web browser to run. I commented on the likely causes already. I just started from scratch here in that last go around, my development laptop