arduino uno + arduino gsm shield external interrupts

Official Hardware Retired GSM Shield
1

Hello

i am working on a project that will remotely send via sms readings from a sensor once a day.It will be powered by a 12v battery.
Because of the need for low power consumption i use a real time clock to wake up the uno from sleeping mode once a day.
unfortunately when i bought the arduino gsm shield i realised that uses the pins digital 2,3 for rx and tx which are the only pins for external interrupt on uno.Is there any other way to external interrupt the uno with the real time clock?

Thanks

2

You can configure some pin to interrupt with INTx interruptions.

This is a example: avr-tutorials.com - avr tutorials Resources and Information.

See ATMega328 manual for more information.

3

toadstul:
i am working on a project that will remotely send via sms readings from a sensor once a day.It will be powered by a 12v battery.

Hello, I just started working on something similar on a school project. I want to remotely monitor 24V battery bank and send data via sms to a server and then pull that information to a smartphone. I have no experience with Arduino yet, just started reading.

Do you mind posting some details regarding the HW you're using (mainly the sensors) and maybe some code?
That would be really appreciated!

Thanks

4

Hi.I was in the same position.One option is to change a pin to interrupts in GSM shield:

#include <PinChangeInt.h>
#define DATA 8

void setup() {
  pinMode(DATA, INPUT);
  PCintPort::attachInterrupt(DATA, &cambio, CHANGE);
}

void cambio() {
if (digitalRead(DATA)==HIGH){  //this is a rising edge
    ........ code .......
      }    
else { //this is a falling edge
    ...... code.....
    }
}

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