I need to do when the module have connected power supply, it will automatically turn on the module. Because is there a PWRKEY button, probably grounding it or give on that pin VDD_EXT will not work.
I've read whole Hardware documentation, but I found only schemes where is turning up via transistor or button, but nothing about automatically turn on. This feature have for sample SIM800L coreboard, but scheme of that board isn't available.
Electronic – SIM800 PWRKEY – Automatic start
gsmsimsim900
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Best Answer
To automate the startup of sim800/sim900 module just keep the pwrkey shorted to ground always. As the supply will be provided modem will be on.