GSM module circuit with ESP32 board

[Sacp328]

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]

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

[Sacp328]

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]

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.