Radiohead and interrupts (RHRouter/RH_NRF24)

Projects Networking, Protocols, and Devices
1

Hi,

I am in the progress of building a wireless surveillance system with a base station and sensors (PIR), all nodes are battery driven. I am using the Radiohead library with nrf24l01 devices.

In order to conserve power I would like to power down the Arduinos using sleep modes and interrupts.

The start sequence would be like this:

  1. Base -> Handshake sensors
  2. Base and Sensors setup interrupts and go to sleep.
  3. PIR detects motion and triggers interrupt in Sensor (this actually works as long as I don't use the radio when the interrupt is triggered, i.e. use a LED to indicate motion)
  4. Sensor sends alarm using RHRouter
  5. Base gets interrupt on pin 2 (interrupt number 0)...
    ...
    During prototyping I use Unos.
    I have tried all day to make #4 and #5 work but with no success. In order to track down the problem I have disabled interrupts in the sensors nodes using a loop instead which polls the
    PIR-pin and sends an alarm using RF when triggered. This works as long as I use a loop in the base as well (recvfromAckTimeout).

If I could get the interrupt in the base station to work that would be good progress. I have submitted the code used in the Base but in short. My interrupt setup is :

int radioIrqPin = 2;    //the digital pin connected to the Radio IRQ
void setup()
{  
     pinMode(radioIrqPin, INPUT);  
   
    attachInterrupt(0, wakeUpNow,FALLING);
}

void sleepNow()
{

    Serial.println("Enter Sleep Mode");
    set_sleep_mode(SLEEP_MODE_PWR_DOWN);
   
    sleep_enable();
   
    attachInterrupt(0,wakeUpNow,FALLING);
   
    sleep_mode();
   
    //THE PROGRAM CONTINUES FROM HERE AFTER WAKING UP
   
    sleep_disable();
   
    detachInterrupt(0);
   
    //
    // This is to allow the Arduino to fully wake.
    //
    delay(150);
   
    //wakeUpNow() code will now be executed    
}

void wakeUpNow()
{    
    Serial.println("MOTION");
    sensor1->readRF(&manager, 1000, &(buf[0]));
}

void loop()
{
    sleepNow();
}

Have I missed something regarding interrupts?
Thanks
Nicklas

RemoteSensor.cpp (2.12 KB)

RemoteSensor.h (900 Bytes)

SensorBase_Router.ino (4.13 KB)