Okay, your mileage may vary :), however I would approach it with:
- find out what interface the load cell requires (i.e. what does it supply - is it an analogue signal or a a digital stream or Serial ....?) this will determine how you connect the load cell to the project.
- You will need to probably use the map function to scale accordingly (remember to include some kind of calibration function to set it up right)
- Then you can send an email via the GSM shield (have a look at this example and substitute the GSM library classes instead of the ethernet)
- So if you can send an email - you can reverse it to revieve and email and parse the text for a key word and the do something....
SO I would start with a MEGA Arduino (the Uno has too little memory to be really useful, a GSM shield and probably a prototype shield so wire the load cell to and to maybe add a buzzer or LED to show someone it is working), You will need an external power supply 12V 2A at least and this should be good to go!