i have recently started a new and my first project using an arduino uno. What this project entails is a infrared sensor determining if an object is present/or not in a black box and if it is there, send a warning to my mobile via sms using a GSM modem such as the wavecom. i know that i need a rs232 converter and from my reading i believe the MAX232 is sufficient, for connecting the wavecom to the arduino. I also want the ability to set certain user interface parameters in the arduino program via sms from my mobile through the wavecom back to the arduino uno.
I have some questions:
Is this project viable?
What variant of the MAX232 is appropriate? whats the differences?
Is it possible to determine if the wavecom is malfunctioning and outputting an error message/red led on the arduino?
I am having some trouble implementing the system and starting off. any pointers or code examples from people with experience with similar projects would be awesome.
i have seen those options but i am on a tight budget. I was going to purchase a hong kong ebay wavecom for $30 and the maxim chip is only a couple dollars. However the shield option is a backup.
Can the shield be purchased as a build it on your own kit? a certain amount of the project needs to be pieced together/built by us.
I can send AT+SDATATSEND=1,14 and press enter in Terminal v1.9b but all it returns is ">" and I don't know what to do next. I'm assuming its prompting me to input what I want to send, but I do not know how to confirm that input.
please help me
The > is probably the command prompt of the modem inside. Now you can send all kind of AT commands to the phone. You did not tell us what type it is.
if you send "AT\n" you should get "OK".
you could try to phone someone : "ATDT 555123456\n"
DT stands for Dial Tone - the number should be valid of course, eg your house number.
You will have to dive in the manuals of your phone or search the internet for the set of available commands for your phone.
These commands are called AT commands, or sometimes Hayes commands (as Hayes was the first to standardize modemcommands long long ago)