Generic Temperature/repeater node

[blackdog65]

Hi Guys,

I have several nodes up and running which I feed into Domoticz.

I'm currently trying to turn the DallasTemperatureSensor script into a repeater node. I have built some plug-in temp sensors but I have range issues due to living in a "Faraday Mansion". Some of my internal walls are 700mm+ in thickness! My current "get around" is to have a Raspberry Pi + Arduino gateway connected to each wifi point (yeah wifi is a huge issue too!)

So far I have
gw.begin(NULL, AUTO, true);
in the
void setup()

and I'm calling process() in my loop()

But I don't know where to go with regard to sleep/wait etc.
I'd like to take a temp reading every 10 - 15 mins but I'm stuck

Any pointers?

[AWI]

Hi and welcome. You can try a non-blocking code loop like:

if (millis() > lastUpdate + loopDelay){
    < whatever you want to do> ;
   lastUpdate = millis();
}

make sure you have the lastUpdate (and loopDelay) as unisigned long

• or -

use gw.wait() ;

[blackdog65]

Thanks for the reply!

I got my "Arduino for Dummies" book from Amazon today... sooo let's give it a go

[blackdog65]

Ok... I tried this based on the standard dallas DS18B20 sketch and I think it's working.

It shows up in MSController as both a TEMP sensor and an ARDUINO_RELAY

Tomorrow I'll try it with Domoticz

Many thanks for the advice

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

#define COMPARE_TEMP 0 // Send temperature only if changed? 1 = Yes 0 = No

#define ONE_WIRE_BUS 3 // Pin where dallase sensor is connected 
#define MAX_ATTACHED_DS18B20 16
unsigned long WAIT_TIME = 300000; // Wait time between reads (in milliseconds)
OneWire oneWire(ONE_WIRE_BUS); // Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
DallasTemperature sensors(&oneWire); // Pass the oneWire reference to Dallas Temperature. 
MySensor gw;
float lastTemperature[MAX_ATTACHED_DS18B20];
int numSensors=0;
boolean receivedConfig = false;
boolean metric = true; 
// Initialize temperature message
MyMessage msg(0,V_TEMP);

void setup()  
{ 
  // Startup up the OneWire library
  sensors.begin();
  // requestTemperatures() will not block current thread
  sensors.setWaitForConversion(false);

  // Startup and initialize MySensors library. Set callback for incoming messages. 
  gw.begin(NULL, AUTO, true);

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Temperature Sensor", "1.1");

  // Fetch the number of attached temperature sensors  
  numSensors = sensors.getDeviceCount();

  // Present all sensors to controller
  for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {   
     gw.present(i, S_TEMP);
  }
}


void loop()     
{     
  // Process incoming messages (like config from server)
  gw.process(); 

  // Fetch temperatures from Dallas sensors
  sensors.requestTemperatures();

  // query conversion time and sleep until conversion completed
  int16_t conversionTime = sensors.millisToWaitForConversion(sensors.getResolution());
  // sleep() call can be replaced by wait() call if node need to process incoming messages (or if node is repeater)
  gw.wait(conversionTime);

  // Read temperatures and send them to controller 
  for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {
 
    // Fetch and round temperature to one decimal
    float temperature = static_cast<float>(static_cast<int>((gw.getConfig().isMetric?sensors.getTempCByIndex(i):sensors.getTempFByIndex(i)) * 10.)) / 10.;
 
    // Only send data if temperature has changed and no error
    #if COMPARE_TEMP == 1
    if (lastTemperature[i] != temperature && temperature != -127.00 && temperature != 85.00) {
    #else
    if (temperature != -127.00 && temperature != 85.00) {
    #endif
 
      // Send in the new temperature
      gw.send(msg.setSensor(i).set(temperature,1));
      // Save new temperatures for next compare
      lastTemperature[i]=temperature;
    }
  }
  gw.wait(WAIT_TIME);
}

[blackdog65]

Ah... actually it doesn't work
It takes one temp reading and then sits there with a led flashing... damn!

Anyone see the problem?

[AWI]

@blackdog65 You can include a few Serial.print's. It could block for while if "conversionTime" is long..

[blackdog65]

How odd? Turned off and on... (which I'd tried obviously) and has worked perfectly since
go figure

[NotYetRated]

700mm walls? Do you live in a blast shelter?! haha that has got to be infuriating. Although, the sound dampening from room to room between those walls has got to be nice!

[blackdog65]

It drives me crazy! The oldest part of the house pre-dates 1650 and was built to last. I have 4 wifi points hard-wired in as wifi will only reach the next room.

On the plus side, it's cool in summer and warm in winter