💬 Temperature Sensor

gohan

@mfalkvidd I'm on mobile, I didn't read the code 😇

mfalkvidd

@skywatch it looks normal. The precision is probably 1% and the real value close to 100.5%, so sometimes it will be rounded to 101% and sometimes to 100%.

mfalkvidd

@gohan hek has added a great feature that I use a lot on mobile. Click the code box once to maximize it. Super neat!

skywatch

@mfalkvidd,

Did you notice the time line on the bottom of the image. I thought it was supposed to send data once every 30 mins. Seems that something isn't right or I am looking at it from the wrong angle.....?

mfalkvidd

@skywatch I'm not that versed in c/c++ arithmetic, but I suspect the calculation might overflow. Could you add a debug print to see the value of batteryReportFactor?

skywatch

OK I'll do that - seems to be sending battery info every minute still though- strange!

mfalkvidd

@skywatch could you post the entire sketch also, to check if something fishy has crept in?

skywatch

Here is the sketch, debug will be later today I hope....



// Enable debug prints to serial monitor
//#define MY_DEBUG

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69
#define COMPARE_TEMP 1 // Send temperature only if changed? 1 = Yes 0 = No
#define MY_RF24_PA_LEVEL (RF24_PA_LOW)
#define ONE_WIRE_BUS 3 // Pin where dallase sensor is connected 
#define MAX_ATTACHED_DS18B20 3
#include <SPI.h>
#include <MySensors.h>
#include <DallasTemperature.h>
#include <OneWire.h>
int BATTERY_SENSE_PIN = A0;  // select the input pin for the battery sense point
int batteryPcnt = 0;
unsigned long SLEEP_TIME = 2 * 60 * 1000; // 2 minutes Sleep time between reads.
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.
float lastTemperature[MAX_ATTACHED_DS18B20];
int numSensors = 0;
const long interval = 90000;
unsigned long previousMillis = 0;
bool receivedConfig = false;
bool metric = true;
unsigned int batteryReportFactor = 30*60*1000/SLEEP_TIME; // Only report battery every x SLEEP times (x=15 with current values)
unsigned int timesSlept = 0;
// Initialize temperature message
MyMessage msg(0, V_TEMP);

void before()
{
  // Startup up the OneWire library
  sensors.begin();
}

void setup()
{
  // requestTemperatures() will not block current thread
  sensors.setWaitForConversion(false);
  analogReference(INTERNAL);
}

void presentation() {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("HW/CH", "0.5");

  // 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++) {
    present(i, S_TEMP);
  }
}

void loop()
{
  // get the battery Voltage
  if (timesSlept < batteryReportFactor) {
    timesSlept++;
  } else {
    // get the battery Voltage
    timesSlept = 0;
    int sensorValue = analogRead(BATTERY_SENSE_PIN);
    batteryPcnt = sensorValue / 10;
    sendBatteryLevel(batteryPcnt);
  }

  // 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)
  sleep(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>((getControllerConfig().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
      send(msg.setSensor(i).set(temperature, 1));
      // Save new temperatures for next compare
      lastTemperature[i] = temperature;
    }
  }

  int8_t sleep(1, FALLING, SLEEP_TIME);
}```

Thanks!

mfalkvidd

@skywatch code looks good to me. What type of Arduino are you using?

skywatch

I am using a pro mini 3.3v 8MHz. I would ideally like to get a 1MHZ bootloader onto it but the last try stopped the temperature sensors sending data (although battery levels were still sent!)..... Hope it helps.

mfalkvidd

@skywatch could you also print the return value of the sleep function. Maybe that interrupt is triggering it so it returns early?

skywatch

Sorry for the dealy, I have had a week of plumbing problems at home - yuck! :(

So, I came back fresh to this and noticed that I had put the interrupt into the code ready for the water leak sensor (apt considering this weeks activities!) - BUT, I had not assigned the pin nor initialised it in the code. So maybe it was floating and giving random triggers?
I tested by changing from int8_t sleep(1, FALLING, SLEEP_TIME); to int8_t sleep(SLEEP_TIME); but now I get battery level sent every single second! - This is making me crazy......

The log for the gateway has the following.....

Sep  3 07:00:37 HAAS rsyslogd-2007: action 'action 17' suspended, next retry is Sun Sep  3 07:02:07 2017 [try http://www.rsyslog.com/e/2007 ]
Sep  3 06:26:28 HAAS rsyslogd0: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/0 ]
Sep  3 06:26:28 HAAS rsyslogd-2359: action 'action 17' resumed (module 'builtin:ompipe') [try http://www.rsyslog.com/e/2359 ]

Not sure what the above is all about. Nor the below....

7:15:45 HAAS dhcpcd[474]: eth0: Router Advertisement from fe80::3291:8fff:fe06:64bc

But here is sending data every second.....

Sep  3 12:46:52 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:53 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:54 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:55 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:56 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:57 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:58 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:46:59 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75
Sep  3 12:47:00 HAAS mysgw: TSF:MSG:READ,5-5-0,s=255,c=3,t=0,pt=1,l=1,sg=0:75

Will try debug on node next....

skywatch

I.m sure it is a bug in 2.2.0-beta as I have the same issues with another node sending data whenever it changes and not sleeping.

dertho

Hi,

is there any known problem / bug with version 2.1.* and the Dallas temp sensor? (I found non in the bug tracker and/or forum)

I updated several nodes from 1.5 to 2.1.1 and now no temp sensor is working. No temp sensor DS18B20 is found by the node, therefore -127.0 is returned to the controller. I checked the wiring - as illustrated in this manual, everything seems right; incl. the pull-up with 4,7 k. I use the modified version of the Dallas-Library included in the examples package, as stated out in this manual.

Thanks,
Thomas

Mohammed Zaman

I am not a programmer, but trying to learn by making small projects.
I am trying to build a arduino/ESP8266 with temp sensor so that at a particular set temp it sends a single to another arduino/ESP8266 with relay to turn on a cooler/heater. if there is a thread on this, please help me find it.

rejoe2

@Mohammed-Zaman This seems to be possible, you may find more info wrt your topic using "node to node communication" as a keyword for searching the forum.
This might be a good starting point: https://forum.mysensors.org/topic/6386/almost-controller-less-mysensors-switch-light-network/8#

gohan

https://forum.mysensors.org/topic/7810/alternative-passive-mode if you don't want to use a gateway.

sjoerd14

regarding error:

C:\Users\Admin\Documents\Arduino\libraries\DallasTemperature/DallasTemperature.h:249:13: error: 'int16_t DallasTemperature::millisToWaitForConversion(uint8_t)' is private

In the latest version of Miles Burton's the function is public and compiling fine.
https://github.com/milesburton/Arduino-Temperature-Control-Library

You can import the Lib as zip.
You have to remove \ archive the lib: ...\libraries\DallasTemperature

mfalkvidd

@sjoerd14 yes, thanks to MySensors user David Ducatel. The change is tracked in https://github.com/mysensors/MySensorsArduinoExamples/issues/20 and https://github.com/milesburton/Arduino-Temperature-Control-Library/pull/72 but we're still waiting for an official release of milesburton's library.

nofox

Hi, I have few in wall nodes mounted under the light switches. I have two relays and one DS18B20 in each node. When i'm turning light on, switching the relay, the DS18B20 readings jumping about 0.8 degrees celsius up. When I switch off the relay readings back to normal. Anyone have similar problems ? Sensors are away from from node board, relays etc. so it's not about the heat from atmega or relays.

💬 Temperature Sensor

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