Using SIM800L GSM Module with Arduino | 5 Minute Tutorial

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Hi ... Great video !
Can the bell output be fed directly into arduino digital port to detect hi/low .. I want to trigger a relay and operate a factory analog bell ..
Thank you
Paul

paulelliott
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This video, and many other tutorial videos, show the RxD pin connected
directly to the Tx pin of a 5V Arduino ? The RxD pin on the SIM800L has
a MAXIMUM voltage level of 2.8V. It needs a potential divider network
to reduce the 5V signal from the Arduino to the 2.8V input on the
SIM800L module. I have no doubt it works without, but it is stressing
the SIM800L beyond acceptable limits, and I wonder how long it will
last.

davebate
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Is there a way we can contact you? For inquiries?

Qastech