Change UART pin

Question

I am developing GPRS HTTP send request code using a GSM/GPRS module. I found the following code via google:

/*************************************************************************
* SIM800 GPRS/HTTP Library
* Distributed under GPL v2.0
* Written by Stanley Huang <[email protected]>
* For more information, please visit http://arduinodev.com
*************************************************************************/
#include <Arduino.h>
// change this to the pin connect with SIM800 reset pin
#define SIM800_RESET_PIN 7
// change this to the serial UART which SIM800 is attached to
#define SIM_SERIAL Serial
// define DEBUG to one serial UART to enable debug information output
//#define DEBUG Serial
typedef enum {
 HTTP_DISABLED = 0,
 HTTP_READY,
 HTTP_CONNECTING,
 HTTP_READING,
 HTTP_ERROR,
} HTTP_STATES;
typedef struct {
 float lat;
 float lon;
 uint8_t year; /* year past 2000, e.g. 15 for 2015 */
 uint8_t month;
 uint8_t day;
 uint8_t hour;
 uint8_t minute;
 uint8_t second;
} GSM_LOCATION;
class CGPRS_SIM800 {
public:
 CGPRS_SIM800():httpState(HTTP_DISABLED) {}
 // initialize the module
 bool init();
 // setup network
 byte setup(const char* apn);
 // get network operator name
 bool getOperatorName();
 // check for incoming SMS
 bool checkSMS();
 // get signal quality level (in dB)
 int getSignalQuality();
 // get GSM location and network time
 bool getLocation(GSM_LOCATION* loc);
 // initialize HTTP connection
 bool httpInit();
 // terminate HTTP connection
 void httpUninit();
 // connect to HTTP server
 bool httpConnect(const char* url, const char* args = 0);
 // check if HTTP connection is established
 // return 0 for in progress, 1 for success, 2 for error
 byte httpIsConnected();
 // read data from HTTP connection
 void httpRead();
 // check if HTTP connection is established
 // return 0 for in progress, -1 for error, bytes of http payload on success
 int httpIsRead();
 // send AT command and check for expected response
 byte sendCommand(const char* cmd, unsigned int timeout = 2000, const char* expected = 0);
 // send AT command and check for two possible responses
 byte sendCommand(const char* cmd, const char* expected1, const char* expected2, unsigned int timeout = 2000);
 // toggle low-power mode
 bool sleep(bool enabled)
 {
 return sendCommand(enabled ? "AT+CFUN=0" : "AT+CFUN=1");
 }
 // check if there is available serial data
 bool available()
 {
 return SIM_SERIAL.available(); 
 }
 char buffer[256];
 byte httpState;
private:
 byte checkbuffer(const char* expected1, const char* expected2 = 0, unsigned int timeout = 2000);
 void purgeSerial();
 byte m_bytesRecv;
 uint32_t m_checkTimer;
};

The problem is I have no idea how to change or define Rx and Tx Pin. If I define SIM_SERIAL serial1 it's showing me error. I want to change it to pins 10 and 11.

Here is other code whenever I try to compile it shows me error on "serial1" online. above code is sim800.h file

here is program code of send data through http

"SIM800.h"
#define APN "connect"
#define con Serial
static const char* url = "http://arduinodev.com/datetime.php";
CGPRS_SIM800 gprs;
uint32_t count = 0;
uint32_t errors = 0;
void setup()
{
 con.begin(9600);
 while (!con);
 con.println("SIM800 TEST");
 for (;;) {
 con.print("Resetting...");
 while (!gprs.init()) {
 con.write('.');
 }
 con.println("OK");
 con.print("Setting up network...");
 byte ret = gprs.setup(APN);
 if (ret == 0)
 break;
 con.print("Error code:");
 con.println(ret);
 con.println(gprs.buffer);
 }
 con.println("OK");
 delay(3000); 
 if (gprs.getOperatorName()) {
 con.print("Operator:");
 con.println(gprs.buffer);
 }
 int ret = gprs.getSignalQuality();
 if (ret) {
 con.print("Signal:");
 con.print(ret);
 con.println("dB");
 }
 for (;;) {
 if (gprs.httpInit()) break;
 con.println(gprs.buffer);
 gprs.httpUninit();
 delay(1000);
 }
 delay(3000);
}
void loop()
{
 char mydata[16];
 sprintf(mydata, "t=%lu", millis());
 con.print("Requesting ");
 con.print(url);
 con.print('?');
 con.println(mydata);
 gprs.httpConnect(url, mydata);
 count++;
 while (gprs.httpIsConnected() == 0) {
 // can do something here while waiting
 con.write('.');
 for (byte n = 0; n < 25 && !gprs.available(); n++) {
 delay(10);
 }
 }
 if (gprs.httpState == HTTP_ERROR) {
 con.println("Connect error");
 errors++;
 delay(3000);
 return; 
 }
 con.println();
 gprs.httpRead();
 int ret;
 while ((ret = gprs.httpIsRead()) == 0) {
 // can do something here while waiting
 }
 if (gprs.httpState == HTTP_ERROR) {
 con.println("Read error");
 errors++;
 delay(3000);
 return; 
 }
 // now we have received payload
 con.print("[Payload]");
 con.println(gprs.buffer);
 // show position
 GSM_LOCATION loc;
 if (gprs.getLocation(&loc)) {
 con.print("LAT:");
 con.print(loc.lat, 6);
 con.print(" LON:");
 con.print(loc.lon, 6);
 con.print(" TIME:");
 con.print(loc.hour);
 con.print(':');
 con.print(loc.minute);
 con.print(':');
 con.println(loc.second);
 }
 // show stats 
 con.print("Total Requests:");
 con.print(count);
 if (errors) {
 con.print(" Errors:");
 con.print(errors);
 }
 con.println();
}

i already know how to send data through http using AT command and software serial library here is my code

#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX
void setup() {
 // Open serial communications and wait for port to open:
 Serial.begin(9600);
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 Serial.println("Goodnight moon!");
 // set the data rate for the SoftwareSerial port
 mySerial.begin(9600);
 mySerial.write("AT\n");
 delay(1000);
 mySerial.write("AT+CSQ\n");
 delay(1000);
 mySerial.write("AT+SAPBR=3,1,\"APN\",\"internet\"\n");
 delay(2000);
 mySerial.write("\nAT+SAPBR=1,1\n");
 delay(1000);
 mySerial.write("AT+HTTPINIT\n");
 delay(1000);
}
void loop() { // run over and over
 if (mySerial.available()) {
 Serial.write(mySerial.read());
 delay(1000)
 serial.print(enter key)
 }
 if (Serial.available()) {
 delay(2000);
 mySerial.write("AT+HTTPPARA=\"URL\",\"http://www.mydomain.in/index.php?dt=testdata\"\n");
 delay(2000);
 mySerial.write("AT+HTTPACTION=0\n");
 delay(2000);
 mySerial.write("\n");
 mySerial.write(Serial.read());
 }

In this code I define Rx Tx (UART)pin. Can you please suggest me any idea how can i define RX Tx pin in sim800.h file. because serial1 give me error on compiling time

• Ignacio Vazquez-Abrams: That doesn't look like your code.
• Allex: yes i said i found code on google
• Ignacio Vazquez-Abrams: How would you possibly expect us to be able to tell you what to change it to without seeing any of your code?

Answer 1

SoftwareSerial mySerial(10, 11); // RX, TX

Well there you are.

#define SIM_SERIAL mySerial

• Allex: thank you. should i add SoftwareSerial mySerial(10, 11); // RX, TX code in sim800.h file above #define SIM_SERIAL

Answer 2

I think Serial1 has to do with the Hardware serial Port(tx1,rx1) on Arduino mega . But since you are not using Serial.print i suggest you try "Serial/Serial0" if you are using UNO. If you want (10,11) like you said then i think you should use Softwareserial
#include SoftwareSerial.h //check spelling online not sure SoftwareSerial allex(10,11);
#define SIM_SERIAL allex
try it and see if it works.

• Allex: should i change #define con Serial also..
• Allex: i set default serial port using only serial declaration but default RX and TX pin not working
• Allex: I change sim800.h code "#define SIM_SERIAL mySerial" to "#define SIM_SERIAL Serial'