05-11-2023, 07:05 PM
Okay, thank you for the response. I have tried changing the "HardwareSerial.cpp" to RX2 13 and TX2 34 like you suggested. I couldn't get a communication going with your debug code. Also I looked at your pinout definition in LINK_ KC838-A2_pinout and it showed the following:
Looking at the schematics LINK_KC868_A2_schematic the GSM_RX is connected to I34 and the GSM_TX is connected to IO13. I think here lies the problem: I34 is an input only, and the GSM_RX is an input as well.
What I did to make the communication work:
In "HardwareSerial.cpp" : RX2 34 and TX2 13
I had to rewire the gsm module physically. In Header 5 (P4) I switched GSM_RX and GSM_TX
Then it worked. With your configuration it did not work for me. I think it is because pin 34 can't work as a TX pin, as it is an input pin only.
That took a while... Tell me what you think
Quote:Relay1:15
Relay2:2
DS18B20/DHT11/DHT21/LED strip -1: 33
DS18B20/DHT11/DHT21/LED strip -2: 14
Ethernet (LAN8720) I/O define:
#define ETH_ADDR 0
#define ETH_POWER_PIN -1
#define ETH_MDC_PIN 23
#define ETH_MDIO_PIN 18
#define ETH_TYPE ETH_PHY_LAN8720
#define ETH_CLK_MODE ETH_CLOCK_GPIO17_OUT
RS485:
RXD:35
TXD:32
GSM:
RXD:34
TXD:13
DI1:36
DI2:39
IIC BUS:
SDA:4
SCL:16
Looking at the schematics LINK_KC868_A2_schematic the GSM_RX is connected to I34 and the GSM_TX is connected to IO13. I think here lies the problem: I34 is an input only, and the GSM_RX is an input as well.
What I did to make the communication work:
In "HardwareSerial.cpp" : RX2 34 and TX2 13
I had to rewire the gsm module physically. In Header 5 (P4) I switched GSM_RX and GSM_TX
Code:
AT
OK
ATI
SIM800 R14.18
OKThen it worked. With your configuration it did not work for me. I think it is because pin 34 can't work as a TX pin, as it is an input pin only.
That took a while... Tell me what you think