Help with waveshare gsm/gprs/gps shield (B)

[zoey989]

Hello I'm trying to work with the waveshare gsm/gprs/gps shield (B), SIM808, and trying to send a message/turn power on with no success. I've also tried GPS, but both codes for sending message and GPS coordinates don't work.
In the message part, I tried turning on the shield by an analog pin (in the schematic it says it's equivalent to the PWRKEY), but it didn't work. With that said, even when I do turn it on manually, it stays on for a very few time and it turns off after blinking for a bit.

The code I used is similar to one I found in another forum:

#include <SoftwareSerial.h>



SoftwareSerial SIM808(2, 3);


void setup()
{
  pinMode(A5,OUTPUT);
  digitalWrite(A5,LOW);

  SIM808.begin(115200);
  SIM808power();
  delay(20000);  // 
}

void SIM808pwr()
{
  digitalWrite(A5, HIGH);
  delay(1000);
  digitalWrite(A5, LOW);
  delay(5000);
}

void sendSMS()
{
  SIM808.print("AT+CMGF=1\r");                                         
  delay(1000);
  SIM808.println("AT + CMGS = \"+YYYxxxxxxxxx\"");                    
  delay(1000);
  SIM808.println("message sent");        
  delay(1000);
  SIM808.println((char)26);                       
  delay(1000); 
  SIM808.println();
  delay(5000);                                    
}

void loop()
{
  sendSMS();
  do {
  } 
  while (1);
}

[Railroader]

Post the exact code You use. "Similar code" is useless.
Schematics is likely interesting.

[zoey989]

This is the code I use, what I meant by similar is that the code isn't mine and I only modified it a little, but that's the code I'm using. Schematics is here https://www.waveshare.com/w/upload/1/10/GSM-GPRS-GPS-Shield-B-Schematic.pdf