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Topic: SIM900 stopped working (Read 980 times) previous topic - next topic


Hi, I was using the SIM900 shield to send an SMS, everything worked perfect. When I tried it again at 15 minutes it did not work anymore.

Code: [Select]

#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8);

void setup() {

void loop() {

void sendSMS() {
  SIM900.println("Mensaje enviado desde Arduino con GSM/GPRS Shield SIM900");
  Serial.println("Mensaje enviado con exito!");


Two suggestions:

1) Check your connections, make sure none have come loose.
2) Try running SoftwareSerial at 9600.
Beginners guide to using the Seeedstudio SIM900 GPRS/GSM Shield

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