here it is : a no special hardware solution,
any microcontroller with a serial port can be used, all you need is an online windows PC
running this little program:
if you want to see my little aquarium monitor page, made using this stuff have a look here
oh did I mention, this pc program commail can also send EMAILS !!
very usefull for urgent alarm notifications,
as far is a found out ThingSpeak do not support emails, only twitter, I do not know what that is.
January 29, 2014
It is true that Thingspeak cannot send emails however you can now use ThingHTTP to send emails (or other notifications) via the IFTTT maker channel (https://ifttt.com/maker). Its an option if you dont want to run your PC all day and all night.
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