sterretje:
Yep, but OP does not use the shield
Hmmm ok, I didn't mine that nugget in this thread, but I'll take your word for it!
In rey #6 OP mentioned a custom pcb. I might have interpreted that incorrectly though.
Yes I'm building custom PCB myself,and I'm not sure where to connect SIM900 TX and RX
Maybe I should make my PCB match to Arduino's SIM900 shield,and use Arduino's library
Nikola19992:
Maybe I should make my PCB match to Arduino's SIM900 shield,and use Arduino's library
I repeat, all of the libraries allow you to choose the port in the case of hardware serial, and the pins in the case of software serial.
IF memory serves me well, I doubt that that's the case for the specific library that OP is referring to.
Not behind a PC at this moment to verify it.
sterretje:
IF memory serves me well, I doubt that that's the case for the specific library that OP is referring to.Not behind a PC at this moment to verify it.
See reply #11.
We're talking different libraries, I think.
The below is from SendSMS.ino that comes with the IDE (version 1.6.6 and version 1.6.7).
// Include the GSM library
#include <GSM.h>
#define PINNUMBER ""
// initialize the library instance
GSM gsmAccess;
GSM_SMS sms;
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.println("SMS Messages Sender");
// connection state
boolean notConnected = true;
// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while (notConnected) {
if (gsmAccess.begin(PINNUMBER) == GSM_READY) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}
Serial.println("GSM initialized");
}
...
...
The used library is in the Arduino installation directory.
Digging a little through the library and as far as I can see, the GSM class is actually GSM3ShieldV1AccessProvider and that class does not have a constructor or a method to set the pin numbers for RX and TX. But I might have missed it somewhere.