GSM Sim900 module + Arduino control relay
All detail see link : https://a-arduino.com/category/gsm/
Library GSM900 : https://goo.gl/LpfDRD
How to use gsm sim900a control relay
Hardware
1.Arduino UNO
2.GSM Sim900a + Sim card
3.Relay module
4.Cell phone
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GSM
