Max6675 Thermocouple project

[Mr_sensor]

Hi, just started to explore the MySensors possibilities. The first project I'm building is a High temperature MAX6675 Thermocouple which send data to the MQTT broker.

So I ordered some parts and started building the gateway with an arduino uno and Ethernet shield. Than connected the Max6675 and gave it a go!

Although the set-up seems to be quit simple I can not get any temperature read from the sensor?
If I connect it like some of the samples I found I end up with this:

0;255;3;0;9;MCO:BGN:INIT GW,CP=R-NGA--,VER=2.1.1
IP: 192.168.0.87
0;255;3;0;9;MCO:BGN:STP
MAX6675 test
0;255;3;0;9;MCO:REG:NOT NEEDED
0;255;3;0;9;MCO:BGN:INIT OK,TSP=NA
IP: 192.168.0.87
0;255;3;0;9;Attempting MQTT connection...
0;255;3;0;9;MQTT connected
0;255;3;0;9;Sending message on topic: mygateway1-out/0/255/0/0/17
0;255;3;0;9;Sending message on topic: mygateway1-out/0/255/3/0/11
0;255;3;0;9;Sending message on topic: mygateway1-out/0/255/3/0/12
0;255;3;0;9;Sending message on topic: mygateway1-out/0/10/0/0/6
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan
Deg C = nan	 Deg F = nan

I used this example for the wiring: link to max6675-temp-module-wiring

Also had a look at the post about the max6675 here on the forum. After trying several combinations I run out of ideas. So maybe one of you can point me in the right direction to get this finally working

This is the sketch I ended up after changing it several times.

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * REVISION HISTORY
 * Version 1.0 - Henrik Ekblad
 *
 * DESCRIPTION
 * The W5100 MQTT gateway sends radio network (or locally attached sensors) data to your MQTT broker.
 * The node also listens to MY_MQTT_TOPIC_PREFIX and sends out those messages to the radio network
 *
 * LED purposes:
 * - To use the feature, uncomment WITH_LEDS_BLINKING in MyConfig.h
 * - RX (green) - blink fast on radio message recieved. In inclusion mode will blink fast only on presentation recieved
 * - TX (yellow) - blink fast on radio message transmitted. In inclusion mode will blink slowly
 * - ERR (red) - fast blink on error during transmission error or recieve crc error
 *
 * See http://www.mysensors.org/build/esp8266_gateway for wiring instructions.
 * nRF24L01+  ESP8266
 * VCC        VCC
 * CE         GPIO4
 * CSN/CS     GPIO15
 * SCK        GPIO14
 * MISO       GPIO12
 * MOSI       GPIO13
 *
 * Not all ESP8266 modules have all pins available on their external interface.
 * This code has been tested on an ESP-12 module.
 * The ESP8266 requires a certain pin configuration to download code, and another one to run code:
 * - Connect REST (reset) via 10K pullup resistor to VCC, and via switch to GND ('reset switch')
 * - Connect GPIO15 via 10K pulldown resistor to GND
 * - Connect CH_PD via 10K resistor to VCC
 * - Connect GPIO2 via 10K resistor to VCC
 * - Connect GPIO0 via 10K resistor to VCC, and via switch to GND ('bootload switch')
 *
  * Inclusion mode button:
 * - Connect GPIO5 via switch to GND ('inclusion switch')
 *
 * Hardware SHA204 signing is currently not supported!
 *
 * Make sure to fill in your ssid and WiFi password below for ssid & pass.
 */


// Enable debug prints to serial monitor
#define MY_DEBUG

// Enables and select radio type (if attached)
//#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

#define MY_GATEWAY_MQTT_CLIENT

// Set this node's subscribe and publish topic prefix
#define MY_MQTT_PUBLISH_TOPIC_PREFIX "mygateway1-out"
#define MY_MQTT_SUBSCRIBE_TOPIC_PREFIX "mygateway1-in"

// Set MQTT client id
#define MY_MQTT_CLIENT_ID "mysensors-1"

// W5100 Ethernet module SPI enable (optional if using a shield/module that manages SPI_EN signal)
//#define MY_W5100_SPI_EN 4

// Enable Soft SPI for NRF radio (note different radio wiring is required)
// The W5100 ethernet module seems to have a hard time co-operate with
// radio on the same spi bus.
#if !defined(MY_W5100_SPI_EN) && !defined(ARDUINO_ARCH_SAMD)
#define MY_SOFTSPI
#define MY_SOFT_SPI_SCK_PIN 14
#define MY_SOFT_SPI_MISO_PIN 16
#define MY_SOFT_SPI_MOSI_PIN 15
#endif

// When W5100 is connected we have to move CE/CSN pins for NRF radio
#ifndef MY_RF24_CE_PIN
#define MY_RF24_CE_PIN 5
#endif
#ifndef MY_RF24_CS_PIN
#define MY_RF24_CS_PIN 6
#endif

// Enable these if your MQTT broker requires usenrame/password
#define MY_MQTT_USER ""
#define MY_MQTT_PASSWORD ""

// Enable MY_IP_ADDRESS here if you want a static ip address (no DHCP)
#define MY_IP_ADDRESS 192,168,0,87

// If using static ip you need to define Gateway and Subnet address as well
#define MY_IP_GATEWAY_ADDRESS 192,168,0,1
#define MY_IP_SUBNET_ADDRESS 255,255,255,0

// MQTT broker ip address or url. Define one or the other.
//#define MY_CONTROLLER_URL_ADDRESS "m20.cloudmqtt.com"
#define MY_CONTROLLER_IP_ADDRESS 192, 168, 0, 36

// The MQTT broker port to to open
#define MY_PORT 1883

/*
// 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

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#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 <Ethernet.h>
#include <MySensors.h>


// Sample Arduino MAX6675 Arduino Sketch

#include "max6675.h"

#define MY_NODE_ID 10

#define CHILD_ID_TEMP 10
#define TEMP_SENSOR_DIGITAL_PIN 8

int thermoSO = 8;
int thermoCS = 9;
int thermoSCLK = 10;

MAX6675 thermo(thermoSCLK, thermoCS, thermoSO);
int vccPin = 3;
int gndPin = 2;

MyMessage msg(CHILD_ID_TEMP, S_TEMP);

void presentation()  { 
 
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Temp Sensor", "0.1");

  // Register all sensors to gateway (they will be created as child devices)
  present(CHILD_ID_TEMP, S_TEMP);
}


void setup() {
  Serial.begin(115200);
// use Arduino pins 
  pinMode(vccPin, OUTPUT); digitalWrite(vccPin, HIGH);
  pinMode(gndPin, OUTPUT); digitalWrite(gndPin, LOW);
  
  Serial.println("MAX6675 test");
  

  // give the MAX a little time to settle
  delay(500);
}

void loop() {
  // basic readout test
  
   Serial.print("Deg C = "); 
   Serial.print(thermo.readCelsius());
   Serial.print("\t Deg F = ");
   Serial.println(thermo.readFahrenheit());
 
   delay(500);
}

[Mr_sensor]

Any ideas on this any one? How to troubleshoot this? Would be nice to get this working. Thanks

W.