I have a program where specific SMS sent to a GSM module turns one LED on. Then i have another condition if that LED is on and if ultrasonic sensor detects object closer than 20cm to it, it should call specific phone number. It all works properly until i take of GPRS GSM shield off the supply and pl…

GSM GPRS sim900 shield doesn't work properly afte turning it on

kgray9 September 2, 2021, 11:48am 8

Does that only happen when you send a SMS to it? It seems as if those are false readings that are not initiated by sending a SMS to it.

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