Trying to set off on a project to create a wireless enabled Call for Help System like the type used by many OAPs. Unfortunately I'm a complete novice and have no idea where to start, although a friend did recommend Arduino, and this forum for guidance.
The system needs to comprise of a wearable remote that when triggered sends a single to a nearby control unit (in the wearers home) which then activates accesses the home's Wi-Fi connectivity to send a pre-set text message/email/phone call to a number of preprogramed numbers for family, friends neighbours etc.
Any advice on how to proceed or even ideas on where to start would be most appreciated.
Depending on who has to be able to use the sender (eldery person? -> button size) and what range/obstacles the signal has to deal with, you could use a cheap universal car remote kit from eBay for the first part.
possibly RF or Bluetooth. Range of remote to control unit no more than 100ft.
Typically bluetooth hardware has a range of 10 meters, so bluetooth is out.
There are many options in the RF category - cheap 433 MHz modules, nRF modules, XBee modules, etc.
The modules come with different prices, ranges, antenna types, and capabilities. An XBee can read a digital device, like a switch, and send data when the signal changes, so you wouldn't need an Arduino at the sending end. It handles retries, multiple sending modules linked to one coordinator (receiver) module, etc. The trade-off is that the XBees are not cheap.
The real work is done on the receiver end, and that work is not trivial.
Is this a school assignment? This project seems to be very popular as an assignment, because the project is not trivial.