New GSM module test

Reply to New GSM module test on Sun, 08 Dec 2019 09:22:48 GMT

zw29 — Sun, 08 Dec 2019 09:22:48 GMT

It will help a lot if M5STACK can publish more sample code in sms/mqtt communication.

Reply to New GSM module test on Sun, 08 Dec 2019 09:20:08 GMT

zw29 — Sun, 08 Dec 2019 09:20:08 GMT

I modified the Button example and can get "OK" in the result. But I need to press the "A" button twice to get the result. Not sure if this is correct.

#include

void setup() {
// init lcd, serial, but don't init sd card
M5.begin(true, false, true);
M5.Power.begin();

M5.Lcd.clear(BLACK);
M5.Lcd.setTextColor(YELLOW);
M5.Lcd.setTextSize(2);
M5.Lcd.setCursor(65, 10);
M5.Lcd.println("GSM TEST");

Serial2.begin(115200, SERIAL_8N1, 16, 17);

// to power on the gsm module
pinMode(2, OUTPUT);
digitalWrite(2, 0);
delay(3000);
digitalWrite(2, 1);
delay(1000*60);
M5.Lcd.println("Init done!");
}

// Add the main program code into the continuous loop() function
void loop() {
if (M5.BtnA.wasReleased()) {
get_time();
} else if (M5.BtnB.wasReleased()) {
M5.Lcd.clear(BLACK);
M5.Lcd.setCursor(0, 0);
}
// update button state
M5.update();
}

void IotWriteCommand(char cmd[],char date[])
{
char buf[256] = {0};
if(cmd == NULL)
sprintf(buf,"AT\r\n");
else if(date == NULL)
sprintf(buf,"AT+%s\r\n",cmd);
else
sprintf(buf,"AT+%s=%s\r\n",cmd,date);

Serial2.write(buf);
}

//AT+CSQ=?
void get_time(void){
IotWriteCommand("CSQ",NULL);
while(Serial2.available()){
uint8_t ch = Serial2.read();
M5.Lcd.write(ch);
}
}

Reply to New GSM module test on Sun, 08 Dec 2019 09:17:25 GMT

zw29 — Sun, 08 Dec 2019 09:17:25 GMT

@lukasmaximus Thank you for your suggestion. And sorry for the very late reply. The above code does not work for me. it is a blank screen.

Reply to New GSM module test on Mon, 18 Nov 2019 10:27:48 GMT

lukasmaximus — Mon, 18 Nov 2019 10:27:48 GMT

Hi @zw29 did you look at the Arduino code?

#include 

void IotWriteCommand(char cmd[],char date[]){
  char buf[256] = {0};
  if(cmd == NULL)
  sprintf(buf,"AT\r\n");
  else if(date == NULL)
  sprintf(buf,"AT+%s\r\n",cmd);
  else
  sprintf(buf,"AT+%s=%s\r\n",cmd,date);

  Serial2.write(buf);
}
//AT+CSQ=?
void get_time(void){
  IotWriteCommand("CSQ=?",NULL);
  while(Serial2.available()){
    uint8_t ch = Serial2.read();
    Serial.write(ch);
    M5.Lcd.write(ch);
  }
}

void setup() {
  M5.begin();
  Serial.begin(115200);
  Serial2.begin(115200, SERIAL_8N1, 16, 17);
  pinMode(2, OUTPUT);
  digitalWrite(2, 0);
  delay(3000);
  digitalWrite(2, 1);
}

void loop() {
 if(M5.BtnA.wasReleased()){
    M5.Lcd.fillScreen(TFT_BLACK); 
    M5.Lcd.setCursor(60,80,2);
    get_time();
  }
}

The code really doesn't seem to do much other than fill the screen with black and supposedly print the time to the screen, Was there any output on the serial terminal?

It looks as though it is simply a template and you need to add in your own AT commands. I do not have a GSM module to test unfortunately，What is your intended use for the project?