I try to use Arduino Mega for data mining from for example some thermometers over 24h periods. After each passed period I'll start my PC (Windows 7) where a processing scetch is startet to read the gathered data from my Arduino via serial interface (com3). But in the moment the serial communication starts, all my data on Arduino are erased! In the attached sketches a simple watch replaces my thermometers. Has anyone some ideas?
normally arduino reset itself when a serial connection is established on arduino mega PCB is there a pad named "RESET-EN" you need to cut whit a knife the copper between the pads for remove the autoreset. ATTENTION that you loose the autoreset function for program the micro, so the better things is to solder a jumper on the pads and remove it after the upload of the program
How about using a SD card to store the data?