Posted: Mon Apr 07, 2014 9:00 pm Post subject: Just starting out. Newbie questions
Hi,
I am just starting a project where I want to transmit analog voltage signals across the internet and I am a little overwhelmed. I have a design up and running using RF MODEMS that is working fine, so I think I have a good understanding on most of what I need to do. I just need to move from MODEMs to the internet.
Can anyone give me a nudge in the right direction? What hardware should I look into?
You will need to build a server you can have a look at my ENC28J60 webserver in the blog section for some code and ideas but I reccomend using an Arduino board and Wiznet W5100 sheild as this does the TCPIP work for you . With some changes my webserver code will work on the W5100 infact I am at present moving it to the W5100. Some things you need to read up on are port forwarding in your modem/router , using Virtual Private Networking VPN to sheild the device from hacking attempts on the internet if you do not use VPN then you should write some code to deal with this. Using a web server set up allows you to get to the data from multiple devices using diffrent methods by using served web pages and or requests to the server for data. the choice of Micro is important as you will find you will need a large amount of ram for buffers so you need to start at 128K or larger devices as they have 8K of ram Note the M1284 is one of the best with 16K of ram and 20Mhz clock but no Arduino sheld exits for it but I am about to make myself one in the next week or two and will make the Kicad files avaliable for all to use. The other device to look at is the Wiznet WEB200 board this has a Mega 128 with 32K of external ram , 256K of external flash for data storage and a Wiznet TCPIP chip all on a small board I will also be working with this once I have the code working on the Arduino sheild.
you need to wonder if you want :
- wired or wireless internet
- in case of wireless, if you have wifi access or that you need a GSM unit with tcp/ip. _________________ Mark
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