/*Avr atmega328p on minimal board (Cisesco Xino) Fuses set using avr studio 4 to save power before Arduino code loaded.
Brown-out detect off | Use internal 8MHz crystal etc. See http://www.gammon.com.au/forum/?id=11497
GSM shield: Spark-fun Cellular Shield with SM5100B. See http://www.coolcomponents.co.uk/catalog/cellular-shield-with-sm5100b-p-490.html
GSM shield Tutorial here: http://tronixstuff.wordpress.com/2011/01/19/tutorial-arduino-and-gsm-cellular-part-one/
GSM shield is powered by a separate 5v supply due to high current needed when transmitting.
Arduino goes to sleep after initial setup. Interrupt attached to PIN2 (Arduino interrupt 0).
grnd pin with 22K resistor. When pin goes HIGH sleep is interrupted and a GSM alarm is activated. LED lights up and txt message sent.
NB I used PINS 7 and 8 on the arduino, for the serial cell to communicate with the GSM shield, but wire them to the GSM shield PINS 2 and 3.
This is so the interrupts don't conflict with the serial cell. So the shield is not piggy-backed on the Arduino but is plugged into breadboard.
*/
#include <avr/sleep.h>
#define PIN 2 // external interrupt pin
byte awakeFlag = 0;
const byte LED = 11;
const byte GSMpwr = 10;
int count = 0;
#include <NewSoftSerial.h>
NewSoftSerial cell(7,8); // We need to create a serial port to talk to the GSM module. Use pins other than 2 or 3 as we need these for interrupts
//7 and 8 worked ok
char mobilenumber[] = "**********"; // recipient's mobile number
void setup() {
pinMode (GSMpwr, OUTPUT);
digitalWrite(GSMpwr, LOW); //alarm GSM pwr ON
pinMode (LED, OUTPUT); // so we can update the LED
digitalWrite (LED, HIGH); //test ON /OFF
delay(200);
digitalWrite (LED, LOW);
pinMode(PIN, INPUT); //set the iterrupt pin to input
digitalWrite(PIN, LOW); //set it low
attachInterrupt(0, awake, CHANGE); // attach an Interrupt to our pin and grnd it with 22K resistor
//=============SLEEP to save power========================================================================
set_sleep_mode (SLEEP_MODE_PWR_DOWN);
sleep_enable();
sleep_cpu ();
}
void loop() {
if (awakeFlag > 0)
{
alarm(); //trigger alarm
}
}//end of void loop()
void alarm()
{
digitalWrite(LED, HIGH); //alarm LED ON
//**** power up GSM here BC546B tranistor switches GSM power on
//NOTE must get a higher power one for final circuit**************************************************************
digitalWrite(GSMpwr, HIGH); //alarm GSM pwr ON GSMpwr [pin10] is connected to base of transistor via a 220ohm resistor,
// +5v to GSM Vin and collector to GSM Vout, emmiter to GRND
cell.begin(9600);
delay(35000); // give the GSM module time to initialise, locate network etc.
cell.println("AT+CMGF=1"); // set SMS mode to text
cell.print("AT+CMGS="); // now send message...
cell.print(34,BYTE); // ASCII equivalent of "
cell.print(mobilenumber);
cell.println(34,BYTE); // ASCII equivalent of "
delay(500); // give the module some thinking time
cell.print("Shed Alarm"); // our message to send
cell.println(26,BYTE); // ASCII equivalent of Ctrl-Z
delay(15000); // the SMS module needs time to return to OK status
{
delay(1);
}
while (1 > 0);
} //end of void alarm()
void awake()
{
sleep_disable();
awakeFlag = 1;
}
I've attached a circuit to show the connections Q1 is a BC546B tranistor - must get a higher power one for final circuit .
The bulb in the circuit symbol represents the GSM module.
I didn't have a GSM module in my circuit simulator.
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| Arduino Forum :: Members :: trendski
see this link
I could carefully solder the pin off and hook it up to one of the shield pins. Very wary though it case I'm totally off track.