Please help me!!!
I m using Arduino uno and Seeed studio GPRS shield, but I am getting out put:
GSM Shield testing.
ERROR: SIM900 doesn’t answer. Check power and serial pins in GSM.cpp
I attached with power, jumpers D7(RX) and D8(TX) in Seeed studio GPRS shield
#define GSM_TXPIN 7
#define GSM_RXPIN 8
//If not used, is better to exclude the HTTP library,
//for RAM saving.
//If your sketch reboots itself proprably you have finished,
//your memory available.
//If you want to use the Arduino functions to manage SMS, uncomment the lines below.
//To change pins for Software Serial, use the two lines in GSM.cpp.
//GSM Shield for Arduino
//this code is based on the example of Arduino Labs.
//Simple sketch to send and receive SMS.
Serial.println(“GSM Shield testing.”);
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 2400or slower.
//Enable this two lines if you want to send an SMS.
if (sms.SendSMS("+971505393365", “Arduino SMS”))
Serial.println("\nSMS sent OK");
//Read if there are messages on SIM card and print them.
if(gsm.readSMS(smsbuffer, 160, n, 20))
What mistake i did?
Please anyone reply me, tks…