1. Motion doesn't seem to work that great - meaning that it takes at least one minute after being untripped to be tripped again
2. Door/window doesn't seem to work - I think I have to add this part, but I'm a bit overwhelmed
3. Temperature starts with temperature of -127C and doesn't update at all (I held my finger on it for 2 minutes) plus I think I need something to avoid -127 temps, like :

if (lastTemperature != tempC && tempC != -127.00)

For your info I used these pins to connect my sensors :

const int PIR_PIN = 3; - PIR sensor
const int INTERRUPT = 4; - Door/Window
const int DALLAS_PIN = 5; - Temperature sensor
[...]
unsigned long readTempInterval = 1 * 60 * 1000UL; - modified read interval to 1 minute for testing purposes

Also I get this output of the serial monitor once I compile and upload the sketch to my nano after 2 minutes and multiple tries to trip PIR sensor :

sensor started, id 2
send: 2-2-0-0 s=255,c=0,t=17,pt=0,l=5,st=ok:1.4.1
send: 2-2-0-0 s=255,c=3,t=6,pt=1,l=1,st=ok:0
send: 2-2-0-0 s=255,c=3,t=11,pt=0,l=12,st=ok:Multi-Sensor
send: 2-2-0-0 s=255,c=3,t=12,pt=0,l=8,st=ok:1.0alpha
send: 2-2-0-0 s=1,c=0,t=1,pt=0,l=0,st=ok:
send: 2-2-0-0 s=2,c=0,t=6,pt=0,l=0,st=ok:
send: 2-2-0-0 s=2,c=1,t=0,pt=2,l=2,st=ok:-127
Tripped
send: 2-2-0-0 s=1,c=1,t=16,pt=2,l=2,st=ok:1
Not Tripped
send: 2-2-0-0 s=1,c=1,t=16,pt=2,l=2,st=ok:0
Tripped
send: 2-2-0-0 s=1,c=1,t=16,pt=2,l=2,st=ok:1

I would appreciate any help I can get to get this started... this project has been on hold for at least 1 year and I would like to implement it now since I have all the parts I need, including 5 cases for the motion detectors (I will need to have at least two variations for them). My focus right now is getting a working sketch, with repeating functions or not, I can place repeaters if needed that is not a problem.

#include <MySensor.h>
#include <SPI.h>
#include <DallasTemperature.h>
#include <OneWire.h>

//myPins
const int PIR_PIN = 3;
const int INTERRUPT = 1;
const int DALLAS_PIN = 4;

//myDevices
const int PIR_SENSOR = 1;
const int DALLAS_SENSOR = 2;

OneWire oneWire(DALLAS_SENSOR);
DallasTemperature DallasSensors(&oneWire);

int lastTemperature = -99;
unsigned long readTempInterval = 60 * 60 * 1000UL;  // One Hour Sleep time between reports (in milliseconds)
unsigned long sleepTime = readTempInterval; 
boolean lastTripped = 0;
boolean sendTemp = true;

MySensor gw;

MyMessage motionMsg(PIR_SENSOR, V_TRIPPED);
MyMessage tempMsg(DALLAS_SENSOR, V_TEMP);

void setup()
{
  DallasSensors.begin();
  //DallasSensors.setWaitForConversion(false);  /I could not get this to compile
  gw.begin();
  gw.sendSketchInfo("Multi-Sensor", "1.0alpha");
  pinMode(PIR_PIN, INPUT);      // sets the motion sensor digital pin as input
  gw.present(PIR_SENSOR, S_MOTION);
  gw.present(DALLAS_SENSOR, S_TEMP);
}

void loop()
{
  //gw.process(); don't need this, it is a one-way device.
  boolean tripped = digitalRead(PIR_PIN);
  if (lastTripped != tripped )
  {
    Serial.println(tripped? "Tripped" : "Not Tripped");
    gw.send(motionMsg.set(tripped)); // Send tripped value to gw
    lastTripped = tripped;
  }
  if (sendTemp)
  {
    DallasSensors.requestTemperatures();
    int tempC = (int) DallasSensors.getTempCByIndex(1);
    gw.send(tempMsg.set(tempC));
    lastTemperature = tempC;
    sendTemp = false;
  }
  unsigned long startSleepTime = millis();
  gw.sleep(INTERRUPT, CHANGE, sleepTime);
  unsigned long endSleepTime = millis();
  if (endSleepTime - startSleepTime >= sleepTime)
  {
    sleepTime = readTempInterval;
    sendTemp = true;
  }
  else
  {
    sleepTime = max(sleepTime -= (endSleepTime - startSleepTime), 1000UL);
  }
}

It will send temp to controller once an hour... you can change that for testing;

also will detect motion...

it may need debouncing.

hopefully this is step in the right direction

you don't have a working sketch?

this will sleep the device until the interrupt triggers it to awaken...

gw.sleep(INTERRUPT,CHANGE, SLEEP_TIME);

you are correct that it seems that the sleep(750) function will block your device, I don't think you want that.

I've read this thread with interest because I want to make my Motion/Temp sensor using Dallas.

Adapting the given code was quite easy (well I guess as I have not tested it for now :D ), I only have changed gw.wait with gw.sleep, because if I understand it correctly, gw.sleep put the sensor in sleep mode which is a bit better for battery :

#include <MySensor.h>  
#include <SPI.h>
#include <DallasTemperature.h>
#include <OneWire.h>

#define DIGITAL_INPUT_SENSOR 3   // The digital input you attached your motion sensor.  (Only 2 and 3 generates interrupt!)
#define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway)
#define CHILD_ID_S1 1   // Id of the sensor child


#define ONE_WIRE_BUS 4 // Pin where dallase sensor is connected 
#define CHILD_ID_T1 2 //CHILD ID for temp


OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DallasSensors(&oneWire);
float lastTemperature ;
unsigned long SLEEP_TIME = 30000; // Sleep time between reports (in milliseconds)
unsigned long lastRefreshTime = 0;
boolean lastTripped = 0;

MySensor gw;
// Initialize motion message
MyMessage motionMsg(CHILD_ID_S1, V_TRIPPED);
MyMessage tempMsg(CHILD_ID_T1,V_TEMP);

void setup()  
{  
   // Startup OneWire Temp Sensors
    DallasSensors.begin();
    DallasSensors.setWaitForConversion(false);

  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Motion and Temperature Sensor", "1.0");

  pinMode(DIGITAL_INPUT_SENSOR, INPUT);      // sets the motion sensor digital pin as input
  // Register all sensors to gw (they will be created as child devices)
  gw.present(CHILD_ID_S1, S_MOTION);
  gw.present(CHILD_ID_T1, S_TEMP);
  
}

void loop()     
{
	// Process incoming messages (like config from server)
	gw.process();
	
	// Read digital motion value
	boolean tripped = digitalRead(DIGITAL_INPUT_SENSOR) == HIGH; 

	if (lastTripped != tripped ) 
	{
		Serial.println("Tripped");
		gw.send(motionMsg.set(tripped?"1":"0")); // Send tripped value to gw 
		lastTripped=tripped;
	}

	boolean bNeedRefresh = (millis() - lastRefreshTime) > SLEEP_TIME;
	if (bNeedRefresh)
	{
		lastRefreshTime = millis();
		DallasSensors.requestTemperatures();
		
		gw.sleep(750);
		float tempC = DallasSensors.getTempCByIndex(1);
		float difference = lastTemperature - tempC;
		if (tempC != -127.00 && abs(difference) > 0.1)
		{
			// Send in the new temperature
			gw.send(tempMsg.set(tempC, 1));
			lastTemperature = tempC;
		}
	}
	else
	{
		gw.sleep(INTERRUPT,CHANGE, SLEEP_TIME);
	}
}

But I'm concerned about thoses particular lines :

lastRefreshTime = millis();
		DallasSensors.requestTemperatures();
		
		gw.sleep(750);
		float tempC = DallasSensors.getTempCByIndex(1);

Why do we need gw.sleep(750) ? My concern is, when the sensor tries to pull temperature, it could not trigger new motion state for at least 750ms ? This is a problem for me, as I want to use these sensor to trigger light when I come in the room, so I need it to be fast.

Thanks !

@AWI Yes I want all my nodes to be repeaters,

Why?
Unless you plan expand your network in the near future, think the increased complexity just will give you trouble.

@CaptainZap It your sketch you have this line:
#define ONE_WIRE_BUS 14

What pin is your Dallas sensor connected to?

One sensor is connected to A0(14) the other is connected to D5 as it can be seen in my last sketch. Temperature reporting worked on, in my original sketch, however the sketch wasn't perfect so I improved it based on feedback.

@m26872 The sensor is on a breadboard 5cm from the gateway, and I'm not sure about the repeater part...

What pin is your Dallas sensor connected to?