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How to Use SIM800L to Send SMS and Control Relay by SMS

Description:
This tutorial is showing how to use SIM800L to send sms and receive sms to control relay. SIM800L module is small in size and can be used to interface with Arduino to send sms, receive sms, call, receive call and else. In this tutorial, we only focus on send sms and control relay by receiving sms.
Specfication:
GPRS multi-slot class12 connectivity: max. 85.6kbps(down-load/up-load)
GPRS mobile station class B
Controlled by AT Command (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands)
Supports Real Time Clock
Supply voltage range 3.4V ~ 4.4V
Supports A-GPSSupports 3.0V to 5.0V logic level
Low power consumption, 1mA in sleep mode
Compact size 23mm x 35mm x 5.6mm

List Of Material:

Arduino UNO
Arduino SIM800L GPRS GSM Module
DC-DC Adjustable Step Down Converter Power Module
Female - Male Jumper Wire
Arduino Push Button (Green) B3F
Single Channel 5V Relay Module
Pin Header Module (Series Connector)”

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