“Control your gate (or whatever you want) for free using a simple phone call.
Story
This project shows how to use an Arduino to receive a call and compare the calling number with numbers saved in the microSD card, without answering! This solution works also with a plain SIM with no data plan.
It’s also possibile to save new authorized numbers via SMS.
What you need
The project is based on an Arduino MKR GSM 1400, an antenna, a LiPo battery pack, an Arduino MKR MEM shield, a microSD card, an Arduino MKR Connector Carrier, a Grove Relay Module, one SIM card, and of course, a phone!
The Arduino MKR GSM 1400 executes the sketch and supports the GSM connection that allows the call and SMS receiving features required by our project;
Antenna and battery pack are respectively used to allow the connection to the cellular network with a good signal and to power the device when other power supplies are not available;
The Arduino MKR MEM shield and microSD card (formatted as FAT16 or FAT32) are used to store a file with all the authorized phone numbers;
Arduino MKR Connector Carrier is used to easily connect other electronics module as the Grove Relay Module;
The SIM card is required to access the GSM network;
PIN, is required to use the sim card.”