i have an arduino with an ethernet shield and a temperature sensor (DS18B20). On the arduino is a Modbus TCP Server running. The Modbus Server is available over a dynamic dns domain. A Webserver is pulling the sensor data every 15 minutes and writes the values in a mysql database. My website is displaying the values:
I don't know much about Ethernet or webservers so do you mean you post the data on a website every 15 minutes and anyone can look at it or is it a Login controlled website to view the data ?
in case you haven't been paying attention there is an epidemic demand for remote temperature monitoring of plant growing operations disguised as "My grandma's vegetable garden" but it is obvious it is much more than that. The people who need them have money to burn so if you want to make some money you should concentrate on marketing a Login access webserver temp logger product and sell it with "n" sensors as a plug & play package. Grandma will thank you..... XD