Dear friends, I need help I live in Croatia and I'm a voluntary fireman we have a big problem with us about it and that is: when we receive reports to the station, our volunteer firemen hard obavjijeste about it. We only have the old method of notification and that the siren. The problem arises because maybe someone will hear the siren. And all it takes slow, so we call each other on the phone. before we had a device for informing sending messages on his cell phone and then call on his cell phone. I saw a lot of projects with Arduino and GSM900 on youtube for calls and messages, or anywhere that is not enclosed in a code and I never saw kodkoji can send SMS and make calls to more than one cell phone. Perhaps you understand what I need but here it is: So I need a code when on duty firefighter click the button that sent the first SMS to 30-50 cell phones and immediately thereafter automatically connects calls on all those 30-50 mobitelja. Once this is done the process is finished. SMS would look like this (Come immediately to the fire station, we have a fire)
Now if there is a possibility I would like to press the other button, this same process is repeated perhaps only for less cell phone about 20 SMS would look like this (Come immediately to the fire station, we have the technical intervention) I reduced the number of cell phones because not everyone has permission to go to the technical intervention Please help us, because we want to make our citizens feel safer and that we react quickly.
And the old-fashioned way to the city to hear the sirens, people are reminded at times of war and immediately get upset Please help us and thank you for everything and sorry for my bad english ;)