Hello ! I had already created a topic on this subject a few weeks ago, but I just realized that the tutorial link I sent had nothing to do with the topic. I am so sorry, so here is the fixed version. I would like to test the GSM SIM900 module as part of my internship project. Here is the tutorial…

GSM module SIM 900 Problem to send SMS (FIXED VERSION)

johnwasser August 26, 2021, 12:20pm 10

It looks like the data returning from the SIM900 is complete garbage. Are you sure the SIM900 is set to 9600 baud?

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