GSM module circuit with ESP32 board

Sacp328
Posts: 2
Joined: Mon Feb 11, 2019 5:30 pm

GSM module circuit with ESP32 board

Postby Sacp328 » Mon Feb 11, 2019 5:49 pm

I am using quectal m95 gsm module with esp32 board to create a point to point cellular connection, Can i connect thier TX and RX pins directly or i need to do some volatge level conversions???

permal
Posts: 365
Joined: Sun May 14, 2017 5:36 pm

Re: GSM module circuit with ESP32 board

Postby permal » Tue Feb 12, 2019 7:27 am

Check the datasheets for voltage levels. ESP32 uses 3.3V so if your devices uses the same you should be good to go.

Sacp328
Posts: 2
Joined: Mon Feb 11, 2019 5:30 pm

Re: GSM module circuit with ESP32 board

Postby Sacp328 » Tue Feb 12, 2019 8:37 am

permal wrote:
Tue Feb 12, 2019 7:27 am
Check the datasheets for voltage levels. ESP32 uses 3.3V so if your devices uses the same you should be good to go.

my gsm module uses something around 3.9 to 4 V, what should i do.

permal
Posts: 365
Joined: Sun May 14, 2017 5:36 pm

Re: GSM module circuit with ESP32 board

Postby permal » Tue Feb 12, 2019 11:10 am

4V logic? Sounds like an odd value. Are you sure about that?

In any case, use a levelshifter, such as the TXB0102DCUR.

You could also use a simple voltage divider based on two resistors for each channel.

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