(Last Updated On: July 17, 2019) Table of Contents Description:The components and tools used in this project can be purchased from Amazon; the components purchase links are given in the description. GSM SIM900A module pinout:Arduino GSM Project – Circuit Diagram:Interfacing:Programming:Watch Video Tutorial:Other GSM-based Projects: Description: Arduino GSM Project: Security Alert message to multiple numbers- In … Continue reading Arduino GSM Project: Security Alert message to multiple numbers