Arduino Mega2560 with W5100 shield with GSM 2G gateway

Theengs OpenMQTTGateway GSM 2G gateway
1

A6 GSM is connected with an Arduino Mega2560 with the W5100 shield on top.
GRN - GRN
U_RXD - PIN7
U_TXD - PIN6

I’ve swapped 7&6
Tried different power settings, currently it’s on a 2A wall USB charger.
The A6 module works! I can ring it, outputs serial when connected to USB on 115200 baud.
I chanced the baudrate in config_2G.h from 9600 to 115200.
Perhaps the W5100 uses pin6&7?
I chanced the pins to 14 & 15
I chanced the pins to 16 & 17
I chanced the pins to 7 & 6
I chanced the pins to 6 & 7
I chanced the pins to 17 & 16
I chanced the pins to 15 & 14
I got stock here:

--- Miniterm on /dev/ttyUSB0  115200,8,N,1 ---
--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
Spl eth cfg
ip: 
192.168.1.99
Eth ok
1883
Connecting to MQTT by IP adress
192.168.1.100
Bosch BME280 Initialized - Result of .begin(): 0x0
No TSL2561 detected
TSL2561 Initialized. Printing detials now.
------------------------------------
Sensor:       TSL2561
Driver Ver:   1
Unique ID:    12345
Max Value:    17000.00 lux
Min Value:    1.00 lux
Resolution:   1.00 lux
------------------------------------

ACTUATOR_ONOFF_PIN
13
Set to OFF
ZactuatorONOFF setup done 
_2G_TX_PIN 
6
_2G_RX_PIN 
7
Init 2G module: 
5
waiting for network connection
2

Hello,

Are you using a level shifter between the atmega and the a6. If I remember correctly the A6 module needs 3.3v on its signal pins.
The atmega provides 5v.

Added to that take into account that this configuration has never been tested.

3

Thanks, I’ll try
I’ve already tried to lower the 5v signal with a 2k2 and 3k3 resistor.
Perhaps I’ve damaged the GSM board. :thinking:
Waiting for:
4 channel bidirectional 3.3V-5V Level Shifter