Hi folkes,
I wish to switch on and off a circuit via SMS (text messaging). I'd also be interested in sending messages directing when and for how long the circuit should be switch on for. To do this, am I right in saying that I need a GSM module and a microcontroller? What model of GSM module would you recommend?
Lets say I wished to complicate things further by adding a LCD display, in order to show the status of the circuit (whether on or off, if it is scheduled to come on etc), what kind of contoller would be suitable in this case?
I was also thinking that it might be necessary to include a key pad. This would allow the user to enter the mobile number that the circuit should respond to (stop others interfering with the circuit). Or the keypad could be used for entering a pin number for the device, and this pin would be requested in order for the user to be granted access to switching on and off the system via their phone.
So to sum up, I think I'm right in saying that I need a GSM module, a microcontroller, a keypad (12 keys should be more than enough) and a LCD display (20 x 4 LCD module perhaps?). Can you recommend me models for these 4 devices as I'm not at all familiar with this area and there is so many devices out there.
Any other advice?
Thanks very much for your help,
Barry.