Hi @teastain2 thank you for your reply,
Nope I haven't, I only followed the meshtastic site instructions, connected the t-echo via usb then drag and dropped the file.
Thank you for the schematic, I haven't found it anywhere.
For the calculations in NRF52840, I have no idea where to start because I don't know how to approch with meshtastic software inside.
Thanks in advance
-Diego

Hi everyone, I have an answer, T-Echo has a little connector with scheme behind t-echo, the connector has 10 pin:
-GND. -VDD_Power
-P0.06 -VDD_Power
-P0.08 -SDA
-P1.07 -SCL
-P1.06 -P0.15

Ok I know that I can use sda and scl for i2c, but I haven't found nothing about other pins, are they digital, can I use they for communicate using UART?
Because I use meshtastic and want to set them in serial module and use them for communicate with an arduino which make me some calculations and send it to t-echo
thanks in advance