This topic contains 25 replies, has 2 voices, and was last updated by Mojako 7 years, 4 months ago.
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How are you connecting through your laptop? Through Hyperterminal? Please make sure Arduino IDE or any other application that you’re using to connect to the device is closed. Please check the baud rate on the AT Command Tester. Also, if you’re using an Arduino shield, please read this,
I assume you loaded this sketch. Are you able to confirm that the device itself is configured for 19200 baud.
//Serial Relay – Arduino will patch a
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART#include <softwareserial .h> SoftwareSerial mySerial(2,3); void setup() { Serial.begin(19200); //Serial.println(“Begin”); mySerial.begin(19200); } void loop() { if (mySerial.available()) Serial.write(mySerial.read()); if (Serial.available()) mySerial.write(Serial.read()); }- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
- This reply was modified 7 years, 5 months ago by Admin.
You can do this to determine the SIM900 baud rate,
Upload the TestModem script from the Arduino IDE (File->Examples->GSM->Tools).
Open the ‘Serial Monitor’.In the TestModem script, try different baud rate settings (9600,14400,19200,28800,34800,57600,115200).
After you change the baud rate, you need to re-load the sketch each time. Also set the same baud rate for the ‘Serial Monitor’ setting.void setup()
{
// initialize serial communications and wait for port to open:
Serial.begin(9600); //Try 9600,14400,19200,28800,34800,57600,115200 values here
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}When the baud on the sketch matches the baud rate on the SIM900 modem, you’d see sucessful modem connection is established and the IMEI is read correctly.
Don,
Are you referring to the TestModem sketch? Since this is provided with the Arduino IDE, i’d expect the syntax to be correct.. What error are you seeing?Hi Muhammad,
Thanks for pointing out the issue with the include file. Have your tried using the TestModem script from the Arduino IDE (File->Examples->GSM->Tools)?When you ran the TestModem script, did you try different port speed settings?
FYI, you need to re-load the sketch each time you change the port speed.void setup() { // initialize serial communications and wait for port to open: Serial.begin(9600); //Try 9600,14400,19200,28800,34800,57600,115200 values here while (!Serial) { ; // wait for serial port to connect. Needed for Leonardo only }Can you please provide a AT Command Tester log as detailed in the link below,