emonTH2 multiple temperature probes

SimonD · 12 October 2021 21:19

I sincerely apologise for being inappropriate, Robert. Safety is not something I take lightly.

lologh · 7 September 2024 19:35

Hi Robert,
I use a emonthv2 and I would to have 4 ds18b20 sensor.
I read night and day, many and many thread and I never found how to put the address of ds18b20 in my sketch. I use the sketch emonTH_DHT22_DS18B20_RFM69CW_Pulse.ino.

Please, can you tell me how I must write the address of ds18b20 in my sketch?
Thanks you so much for your answer.
Laurent

Robert.Wall · 7 September 2024 20:34

Welcome back!

Is this the sketch you are using:

github.com

openenergymonitor/emonTH/blob/master/firmware/emonTH_DHT22_DS18B20_RFM69CW_Pulse/emonTH_DS18B20_in_DHT22_socket_Pulse/emonTH_DS18B20_in_DHT22_socket/emonTH_DS18B20_in_DHT22_socket.ino

/*
  emonTH Low Power DHT22 Humidity & Temperature, DS18B20 Temperature & Pulse counting Node Example 

  Checkes at startup for presence of a DS18B20 temp sensor , DHT22 (temp + humidity) or both
  If it finds both sensors the temperature value will be taken from the DS18B20 (external) and DHT22 (internal) and humidity from DHT22
  If it finds only DS18B20 then no humidity value will be reported
  If it finds only a DHT22 then both temperature and humidity values will be obtained from this sesor
  
  Technical hardware documentation wiki: http://wiki.openenergymonitor.org/index.php?title=EmonTH
 
  Part of the openenergymonitor.org project
  Licence: GNU GPL V3
 
  Authors: Glyn Hudson
  Builds upon JCW JeeLabs RF12 library, Arduino and Martin Harizanov's work

  THIS SKETCH REQUIRES:

  Libraries in the standard arduino libraries folder:
  - JeeLib		        https://github.com/jcw/jeelib

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If it is, although you can connect and it will read 4 sensors, it will not send the data!

It looks to me that a better starting point would be

github.com

openenergymonitor/emonTH/blob/master/firmware/user_contributed/emonTH_V1_5_DHT22_multiple_DS18B20/emonTH_V1_5_DHT22_multiple_DS18B20.ino

/*
 emonTH low power temperature & humidity node
 ============================================
 
 Ambient humidity & temperature (DHT22 on-board)
 Multiple remote temperature (DS18B20) - Support for other onewire sensors such as the MAX31850K may be added at a later date. (If you want to do this yourself and contribute, go for it!)
 
 Provides the following inputs to emonCMS:
 
 1. Battery voltage
 2. Humidity (with DHT22 on-board sensor, otherwise zero)
 3. Ambient temperature (with DHT22 on-board sensor, otherwise zero)
 4. External temperature 1 (first DS18B20)
 5. External temperature 2 (second DS18B20) 
 6. ... and so on. Should automatically detect any DS18B20 connected to the one wire bus. (Up to 60 sensors ordered by address.)
 
 Notes - If you connect additional DS18B20 sensors after node has been set up, the sensor order may change. 
       - Check your inputs in emoncms after adding additional sensors and reassign feeds accordingly.
       -
       - This sketch will also draw more power with more connected sensors and is optimised for getting good data rather than low power consumption.

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even though it is for the emonTH V1.5.

Will you be using the JeeLib radio protocol (which we no longer use for new systems) or the Low Power Labs protocol? If your system is 7 years old, you will certainly be using JeeLib – unless you have updated everything. If you say which, I can look to see what changes will be necessary to convert it to run on the emonTH2 hardware.

lologh · 7 September 2024 20:59

Thanks for your answer.
I try the sketch but no way.
I saw this :
Sans titre
and no data in Emonhub.
when I use the next sketch, data appear directly in Emonhub.
I put sensor address like this in sketch :

No difference.
I don’t understand.

lologh · 7 September 2024 21:04

Perhaps @glyn.hudson or @TrystanLea can give an answer.

I think, I’m not the only one who want to have more than one ds18b20 with his Emonthv2.

Wait and see.

Robert.Wall · 7 September 2024 21:15

I do not understand what you have done.

WHICH sketch? This one: emonTH_DS18B20_in_DHT22_socket.ino ?

You will only get data in emonHub when you have a Node definition in emonhub.conf which matches exactly the format of the data sent by the emonTH.

Also, did you read this:

It sends only the temperature of the first sensor it detects, no more.

I do not expect this sketch emonTH_V1_5_DHT22_multiple_DS18B20.ino to work on an emonTH2. It must be changed because some pin numbers are different.

lologh · 7 September 2024 21:41

I use this sketch :
emonTH_DHT22_DS18B20_RFM69CW_Pulse.ino
I read all you send in last post.
I try to understand all but my English is poor but I try.
How can I know what his the exact Node definition in emonhub.conf which matches exactly the format of the data sent by the emonTH.
Thanks for your time.

lologh · 7 September 2024 21:43

In summary, I could never read multiple ds18B20 with an emonthv2?

lologh · 7 September 2024 22:38

I go forward.
I tried this sketch (emonth2 v4.1.7) and I have this ouput in serial port (I think it’s serial output) :

I define the node in emonhub. conf like it’s wrote in emonth2-2.ino but nothing in log of emonhub.
Whay do you think about that?
Thanks.

glyn.hudson · 7 September 2024 23:31

It should just be a case of changing #define EXTERNAL_TEMP_SENSORS 1 to however many sensors you want.

github.com

openenergymonitor/emonth2/blob/master/firmware/emonth2.ino#L133


      
          #include <avr/power.h>
          #include <avr/sleep.h>
          #include <OneWire.h>
          #include <DallasTemperature.h>
          // Include EmonTH_V2_config.ino in the same directory as this for configuration functions & data
          
          
          #define REG_SYNCVALUE1 0x2F
          #define MAX_SENSORS 4                                                  // The maximum number of external temperature sensors.
                                                                                                                                                
          #define EXTERNAL_TEMP_SENSORS 1                                        // Specify number of external temperature sensors connected                                                                      
                                                                                 
          #define FACTORYTESTGROUP 1                                             // Transmit the Factory Test on Grp 1 
                                                                                 //   to avoid interference with recorded data at power-up.
          
          //---------------------------- emonTH Settings - Stored in EEPROM and shared with config.ino ------------------------------------------------
          struct 
          {
            byte RF_freq = RF69_433MHZ;                                          // Frequency of radio module can be RF69_433MHZ, RF69_868MHZ or RF69_915MHZ. 
            byte networkGroup = 210;                                             // Wireless network group, must be the same as emonBase / emonPi and emonGLCD. OEM default is 210
            byte  nodeID = 23;                                                   // Node ID for this sensor.

You’ll also need to change the emonhub node decoder, at the top of the sketch there’s an example for 4x temp sensors:

    [[23]]
        nodename = emonth2_23
        [[[rx]]]
            names = temperature, external temperature1, external temperature2, external temperature3, external temperature4, humidity, battery, pulsecount
            datacodes = h, h, h, h, h, h, h, L
            scales = 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 1.0
            units = C, C, C, C, C, %, V, p

lologh · 7 September 2024 23:43

Thanks for your answer.
It works almost well now.
In Emonhub.conf, I deleted the “s” in datacodes.
DHT22 sensor doesn’t work and the LED stay ON.
Any idea?
Thank you so much.