nodeMCU, MY_GATEWAY_ESP8266 and Temp Sensor

[mysensors-6043]

Hi since I am new to mysensors, I starting with examples, don't have much experience right now.
Here is my sketch.

#include <ESP8266WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <EEPROM.h>
#include <SPI.h>

// Enable debug prints to serial monitor
#define MY_DEBUG

// Use a bit lower baudrate for serial prints on ESP8266 than default in MyConfig.h
#define MY_BAUD_RATE 115200

// Enables and select radio type (if attached)
#define MY_RADIO_RFM69
#define MY_GATEWAY_ESP8266

// Enable UDP communication
#define MY_USE_UDP
#define MY_PORT 5003 

// Set the hostname for the WiFi Client. This is the hostname
// it will pass to the DHCP server if not static.
#define MY_ESP8266_HOSTNAME "nodeMCUTemperatureECM"   

// How many clients should be able to connect to this gateway (default 1)
#define MY_GATEWAY_MAX_CLIENTS 2

// Controller ip address. Enables client mode (default is "server" mode). 
// Also enable this if MY_USE_UDP is used and you want sensor data sent somewhere. 
#define MY_CONTROLLER_IP_ADDRESS 192, 168, 1, 152

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE

// Enable Inclusion mode button on gateway
// #define MY_INCLUSION_BUTTON_FEATURE
// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60 
// Digital pin used for inclusion mode button
#define MY_INCLUSION_MODE_BUTTON_PIN  3 

// Flash leds on rx/tx/err
// #define MY_LEDS_BLINKING_FEATURE
// Set blinking period
// #define MY_DEFAULT_LED_BLINK_PERIOD 300

// Led pins used if blinking feature is enabled above
#define MY_DEFAULT_ERR_LED_PIN 16  // Error led pin
#define MY_DEFAULT_RX_LED_PIN  16  // Receive led pin
#define MY_DEFAULT_TX_LED_PIN  16  // the PCB, on board LED

#include <WiFiUdp.h>
#include <MyConfig.h>
#include <MySensors.h>

#define ONE_WIRE_BUS 2
#define MAX_ATTACHED_DS18B20 4
int numSensors=0;
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.

void setup() {
  //sensors.begin();
}

void presentation() {
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("nodeMCUTemperatureECM", "1.0");
  // Fetch the number of attached temperature sensors  
  numSensors = sensors.getDeviceCount();
  
  Serial.print("----------------- # of Sensors found >>> ");
  Serial.println(numSensors);
  
  // Present all sensors to controller
  for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {   
     present(i, S_TEMP);
  }
}

void loop() {
  // Send locally attached sensors data here
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");
  delay(1000);
}

[mysensors-6043]

Ok, thank You. So how I declare MySensor gw; in mysensors Version 2 ?

[mfalkvidd]

@mysensors-6043 looks like you have used some of the DallasTemperatureSensor example, is that correct?

If that is the case, it seems heavily modified. Lots of includes that shouldn't be there (MyConfig.h for example) and sensors.begin is called from the wrong funchtion (should be before(), not setup() )

Try starting with the bare example and get that working. Then extend it little by little while checking that it still works.

[mysensors-6043]

ok, I'll give it another try. Learning by doing :-)
Starting with the ESP8266 example and adding the Dallas Temp parts ?

[mfalkvidd]

@mysensors-6043 said:

Ok, thank You. So how I declare MySensor gw; in mysensors Version 2 ?

You don't. It is not used in MySensors 2. https://forum.mysensors.org/topic/4276/converting-a-sketch-from-1-5-x-to-2-0-x describes the differences between version 1.5 and 2.0

[mfalkvidd]

@mysensors-6043 said:

ok, I'll give it another try. Learning by doing :-)

Yes that is a good approach. To me it is the best and the most fun way to learn.

Starting with the ESP8266 example and adding the Dallas Temp parts ?

The Dallas example works on several platforms, it is not esp specific. It does require a specific version of the Dallas library though. You can get the example and the library by downloading https://github.com/mysensors/MySensorsArduinoExamples

[mysensors-6043]

Hey great, I started with a new sketch and did what You recommended. I get the number of sensors now without exception and stack trace. On a good way now I guess. Many thank's and best regards from Switzerland

[Yveaux]

@mysensors-6043 said:

As soon as I call sensor.begin() I get an exception and stack trace

Fatal exception 9(LoadStoreAlignmentCause):

This is usually caused by a library which is not (fully) compatible with 32-bit processors (AVR is 8-bit).
The MySensors library has been ported to ESP8266 and does not throw such exceptions (to my knowledge).
If the DS18B20 library @mfalkvidd pointed at does not solve your issue I would search the net for other people having issues with the same library & ESP8266, to see how they solved it.

[mysensors-6043]

ok, yes lokks like this. A soon as I try to get temp values then I run into an exception again.

void loop() {
  // Send locally attached sensors data here
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");
  delay(1000);
}

[korttoma]

@mysensors-6043 said:

Do not use:

 delay(1000);

Instead try:

wait(1000);

[scalz]

@mysensors-6043

As @Yveaux said, it can be lib compatibility with esp.
So If you want to try, I use this lib for ds18b20, with other mcus : http://www.pjrc.com/teensy/td_libs_OneWire.html (his stuff is neat).
I have not tried with esp8266 though, but i'm pretty sure it works ;) there are defines for esp8266 which are not present in mysensors git..

[mysensors-6043]

ok, i'll try, hmmmm how to import / use this lib ?

[scalz]

@mysensors-6043
how did you import Mysensors? ;) that's the same for every lib :)
So if you don't find it in lib manager, then download it and unzip it in your lib folder. restart arduino. go to examples. simple.
You will find this one in lib manager (look at the one with Paul PaulStoffregen contributor). or download it from his git

[Cravecode]

@mysensors-6043,
Have you been able to confirm that you get temperature readings on the sensor? I would try to simplify your sketch to rule things out.

Here's what I'd do, in the following order:

• Remove all MySensors related code and just get the sensor reading to the serial monitor.
• I see you're looping over several temperature sensors on the node, simplify this, only read one for starters.
• Verify your gateway is on the network by using telnet or netcat. I.e.: nc xxx.xxx.xxx.xxx 5003
• Try just getting your node to "present" to the gateway. Reading the sensor debug via the serial monitor and watch the gateway via netcat.

[mysensors-6043]

Hi, yes, the Hardware is ok. running a Dallas example script shows the temperature from the sensor.
The Gateway is on the Network, I see a DHCP request and get Messages on the iobroker.

[Cravecode]

@mysensors-6043,
The sketch you posted looks like you combined the sensors with the NodeMCU, is this true? Is this NodeMCU acting as a gateway as well?

[mysensors-6043]

yes, but i'm not shure whether this is correct
All I Need is a sensor that sends the temperature via WLAN to UDP Port 5003 of the iobroker (acting as Controller)

Could also be an Arduino Nano with a Radio, e.g. NRF24L01

[Cravecode]

@mysensors-6043,
The normal setup involves 3 pieces:

1. The sensor (aka node) emitting data via RF using something like a NRF24L01
2. A gateway that receives the sensor data via the RF module (NRF24L01) and sends it to a controller over ethernet or wifi.
3. A controller to manage connected nodes and present data to the user.

It seems like you're combining the sensor and gateway into one device. If this is the case, I think you can comment out the #define MY_RADIO_RFM69 line as there is no radio connected. I don't know how this plays into the registration process of a sensor. There is no ID getting associated to the sensor because this is a gateway.

Maybe someone else can chime in who knows whether it's okay to combine the gateway and sensor into one device. If so, how is registration and ID assignment handled?

@mysensors-6043,
Post a updated version of your sketch.

[mysensors-6043]

ok, looks better, I included the library from Paul Stoffregen and commented out #define MY_RADIO_RFM69.
So far no exception. I still can join my home WLAN, but sensor data can not be read.
All I Need is a temp sensor and send the data do a iobroker instance.

The question is whether I'm on the right track with a nodeMCU ?

[mysensors-6043]

Hey Folks
Thank's a lot, the issue is solved. nodeMCU as a gateway measures the temperature, pass it over to an iobroker / mysensors instance. There with a JavaScript, I set a Homematic System Variable which is displayed in the iPad.
So now, I know, when the coffee machine has the right temp.

cheers