How to make a system that uses a mobile sim and that acts on a relay by ringing the sim

Question

I want to create a system that has an internet connection via a mobile sim and allows owners of enabled telephone numbers to switch a relay by ringing the device sim.

The system must be able to register its IP address on dyndns in order to be accessible via url.

The system will be used to allow the opening of a gate only to owners of authorized telephone numbers, who through a call to the system will activate the relay which will pilot the arm for opening.

More precisely, the device must allow me remotely, via internet connection:

1) upload a list of telephone numbers to an archive;

2) enable / disable telephone numbers indicating whether they are always enabled or a date and time of enabling and disabling

3) have a log, downloadable remotely, of the various accesses with date and time

4) The relay must remain closed for a predefined time and then open automatically

What hardware is needed?

score 1 · Answer 1 · answered Jan 06 '20 at 19:36

I want to create a system that has an internet connection via a mobile sim and allows owners of enabled telephone numbers to switch a relay by ringing the device sim.

In this instance, you need a SIM card module. The system just tries to upload some log files which is not too large hence you can buy a GSM module and make a 2G connection to your RPi.
Maybe in your area, using the 2G cellular network has expired and you thought that you must make a connection to DynDNS server so the 100kbps is not enough.

sixfab Raspberry Pi 3G-4G/LTE Base Shield V2 can be a good option.

To see better module by the speed you want, check this link out.