ds18b20 and negative temperature values



  • hi,
    I'm having problems with negative temperatures on a node with 2 ds18b20
    if both sensors measure the positive temperature, the values ​​are correctly sent. If one of the 2 negative negative values ​​is ignored.
    everything works correctly using the example in the library.

    both positive values

    0_1505712997134_Screenshot 2017-09-18 07.23.11.png

    One Negative value

    0_1505713025652_Screenshot 2017-09-18 07.16.34.png



  • As your serial output is different to the temperature sensor example, you should also post your changed code for deeper analysis.



  • Config.h

    #ifndef config_h
    #define config_h
     
    /**********************************
     * Sketch configuration
     */
     
    #define SKETCH_NAME "Temperatura"
    #define SKETCH_VERSION "1.0"
     
    /**********************************
     * MySensors node configuration
     */
     
    // General settings
    #define MY_BAUD_RATE 9600
    #define MY_DEBUG
    //#define MY_NODE_ID 100
    //#define MY_SMART_SLEEP_WAIT_DURATION_MS 500
     
    // NRF24 radio settings
    #define MY_RADIO_NRF24
    //#define MY_RF24_ENABLE_ENCRYPTION
    //#define MY_RF24_CHANNEL 76
    //#define MY_RF24_PA_LEVEL RF24_PA_HIGH
    //#define MY_DEBUG_VERBOSE_RF24
    //#define MY_RF24_DATARATE RF24_250KBPS
     
    // RFM69 radio settings
    //#define MY_RADIO_RFM69
    //#define MY_RFM69_FREQUENCY RF69_868MHZ
    //#define MY_RFM69_FREQUENCY RFM69_868MHZ
    //#define MY_IS_RFM69HW
    //#define MY_RFM69_NEW_DRIVER
    //#define MY_RFM69_ENABLE_ENCRYPTION
    //#define MY_RFM69_NETWORKID 100
    //#define MY_DEBUG_VERBOSE_RFM69
    //#define MY_RF69_IRQ_PIN D1
    //#define MY_RF69_IRQ_NUM MY_RF69_IRQ_PIN
    //#define MY_RF69_SPI_CS D2
    //#define MY_RFM69_ATC_MODE_DISABLED
     
    // RS485 serial transport settings
    //#define MY_RS485
    //#define MY_RS485_BAUD_RATE 9600
    //#define MY_RS485_DE_PIN 2
    //#define MY_RS485_MAX_MESSAGE_LENGTH 40
    //#define MY_RS485_HWSERIAL Serial1
     
    // Message signing settings
    //#define MY_SIGNING_SOFT
    //#define MY_SIGNING_SOFT_RANDOMSEED_PIN 7
    //#define MY_SIGNING_REQUEST_SIGNATURES
    //#define MY_SIGNING_ATSHA204
     
    // OTA Firmware update settings
    //#define MY_OTA_FIRMWARE_FEATURE
    //#define OTA_WAIT_PERIOD 300
    //#define FIRMWARE_MAX_REQUESTS 2
    //#define MY_OTA_RETRY 2
     
    /**********************************
     * MySensors gateway configuration
     */
    // Common gateway settings
    //#define MY_REPEATER_FEATURE
     
    // Serial gateway settings
    //#define MY_GATEWAY_SERIAL
     
    // Ethernet gateway settings
    //#define MY_GATEWAY_W5100
     
    // ESP8266 gateway settings
    //#define MY_GATEWAY_ESP8266
    //#define MY_ESP8266_SSID ""
    //#define MY_ESP8266_PASSWORD ""
     
    // Gateway networking settings
    //#define MY_IP_ADDRESS 192,168,178,87
    //#define MY_IP_GATEWAY_ADDRESS 192,168,178,1
    //#define MY_IP_SUBNET_ADDRESS 255,255,255,0
    //#define MY_PORT 5003
    //#define MY_GATEWAY_MAX_CLIENTS 2
    //#define MY_USE_UDP
     
    // Gateway MQTT settings
    //#define MY_GATEWAY_MQTT_CLIENT
    //#define MY_CONTROLLER_IP_ADDRESS 192, 168, 178, 68
    //#define MY_PORT 1883
    //#define MY_MQTT_USER "username"
    //#define MY_MQTT_PASSWORD "password"
    //#define MY_MQTT_CLIENT_ID "mysensors-1"
    //#define MY_MQTT_PUBLISH_TOPIC_PREFIX "mygateway1-out"
    //#define MY_MQTT_SUBSCRIBE_TOPIC_PREFIX "mygateway1-in"
     
    // Gateway inclusion mode
    //#define MY_INCLUSION_MODE_FEATURE
    //#define MY_INCLUSION_BUTTON_FEATURE
    //#define MY_INCLUSION_MODE_DURATION 60
    //#define MY_DEFAULT_LED_BLINK_PERIOD 300
     
    // Gateway Leds settings
    //#define MY_DEFAULT_ERR_LED_PIN 4
    //#define MY_DEFAULT_RX_LED_PIN  5
    //#define MY_DEFAULT_TX_LED_PIN  6
     
    /***********************************
     * NodeManager configuration
     */
     
    // if enabled, enable debug messages on serial port
    #define DEBUG 1
     
    // if enabled, enable the capability to power on sensors with the arduino's pins to save battery while sleeping
    #define POWER_MANAGER 1
    // if enabled, will load the battery manager library to allow the battery level to be reported automatically or on demand
    #define BATTERY_MANAGER 1
    // if enabled, allow modifying the configuration remotely by interacting with the configuration child id
    #define REMOTE_CONFIGURATION 1
    // if enabled, persist the remote configuration settings on EEPROM
    #define PERSIST 0
    // if enabled, a battery sensor will be created at BATTERY_CHILD_ID (201 by default) and will report vcc voltage together with the battery level percentage
    #define BATTERY_SENSOR 1
    // if enabled, a signal sensor will be created at RSSI_CHILD_ID (202 by default) and will report the signal quality of the transport layer
    #define SIGNAL_SENSOR 0
    // if enabled, send a SLEEPING and AWAKE service messages just before entering and just after leaving a sleep cycle and STARTED when starting/rebooting
    #define SERVICE_MESSAGES 0
     
    // Enable this module to use one of the following sensors: SENSOR_ANALOG_INPUT, SENSOR_LDR, SENSOR_THERMISTOR, SENSOR_ML8511, SENSOR_ACS712, SENSOR_RAIN, SENSOR_SOIL_MOISTURE
    #define MODULE_ANALOG_INPUT 0
    // Enable this module to use one of the following sensors: SENSOR_DIGITAL_INPUT
    #define MODULE_DIGITAL_INPUT 0
    // Enable this module to use one of the following sensors: SENSOR_DIGITAL_OUTPUT, SENSOR_RELAY, SENSOR_LATCHING_RELAY
    #define MODULE_DIGITAL_OUTPUT 0
    // Enable this module to use one of the following sensors: SENSOR_DHT11, SENSOR_DHT22
    #define MODULE_DHT 0
    // Enable this module to use one of the following sensors: SENSOR_SHT21, SENSOR_HTU21D
    #define MODULE_SHT21 0
    // Enable this module to use one of the following sensors: SENSOR_SWITCH, SENSOR_DOOR, SENSOR_MOTION
    #define MODULE_SWITCH 0
    // Enable this module to use one of the following sensors: SENSOR_DS18B20
    #define MODULE_DS18B20 1
    // Enable this module to use one of the following sensors: SENSOR_BH1750
    #define MODULE_BH1750 0
    // Enable this module to use one of the following sensors: SENSOR_MLX90614
    #define MODULE_MLX90614 0
    // Enable this module to use one of the following sensors: SENSOR_BME280
    #define MODULE_BME280 0
    // Enable this module to use one of the following sensors: SENSOR_SONOFF
    #define MODULE_SONOFF 0
    // Enable this module to use one of the following sensors: SENSOR_BMP085
    #define MODULE_BMP085 0
    // Enable this module to use one of the following sensors: SENSOR_HCSR04
    #define MODULE_HCSR04 0
    // Enable this module to use one of the following sensors: SENSOR_MCP9808
    #define MODULE_MCP9808 0
    // Enable this module to use one of the following sensors: SENSOR_MQ
    #define MODULE_MQ 0
    // Enable this module to use one of the following sensors: SENSOR_MHZ19
    #define MODULE_MHZ19 0
    // Enable this module to use one of the following sensors: SENSOR_AM2320    
    #define MODULE_AM2320 0
    // Enable this module to use one of the following sensors: SENSOR_TSL2561    
    #define MODULE_TSL2561 0
    // Enable this module to use one of the following sensors: SENSOR_PT100
    #define MODULE_PT100 0
    // Enable this module to use one of the following sensors: SENSOR_BMP280
    #define MODULE_BMP280 0
    // Enable this module to use one of the following sensors: SENSOR_DIMMER
    #define MODULE_DIMMER 0
    // Enable this module to use one of the following sensors: SENSOR_RAIN_GAUGE, SENSOR_POWER_METER, SENSOR_WATER_METER
    #define MODULE_PULSE_METER 0
     
    #endif
    

    File

    
    /*
      NodeManager is intended to take care on your behalf of all those common tasks a MySensors node has to accomplish, speeding up the development cycle of your projects.
      NodeManager includes the following main components:
      - Sleep manager: allows managing automatically the complexity behind battery-powered sensors spending most of their time sleeping
      - Power manager: allows powering on your sensors only while the node is awake
      - Battery manager: provides common functionalities to read and report the battery level
      - Remote configuration: allows configuring remotely the node without the need to have physical access to it
      - Built-in personalities: for the most common sensors, provide embedded code so to allow their configuration with a single line
      Documentation available on: https://github.com/mysensors/NodeManager
    */
    
    
    // load user settings
    #include "config.h"
    // include supporting libraries
    #ifdef MY_GATEWAY_ESP8266
    #include <ESP8266WiFi.h>
    #endif
    // load MySensors library
    #include <MySensors.h>
    // load NodeManager library
    #include "NodeManager.h"
    
    // create a NodeManager instance
    NodeManager nodeManager;
    
    // before
    void before() {
      // setup the serial port baud rate
      Serial.begin(MY_BAUD_RATE);
      nodeManager.registerSensor(SENSOR_DS18B20, 3);
      nodeManager.setBatteryMin(1.8);
      nodeManager.setBatteryMin(3.2);
      nodeManager.setSleepMinutes(1);
    
      /*
         Register below your sensors
      */
    
    
    
    
      /*
         Register above your sensors
      */
      nodeManager.before();
    
    }
    
    // presentation
    void presentation() {
      // call NodeManager presentation routine
      nodeManager.presentation();
    
    }
    
    // setup
    void setup() {
      // call NodeManager setup routine
      nodeManager.setup();
    }
    
    // loop
    void loop() {
      // call NodeManager loop routine
      nodeManager.loop();
    }
    
    // receive
    void receive(const MyMessage &message) {
      // call NodeManager receive routine
      nodeManager.receive(message);
    }
    
    // receiveTime
    void receiveTime(unsigned long ts) {
      // call NodeManager receiveTime routine
      nodeManager.receiveTime(ts);
    }
    
    


  • @fabix68 sorry, but this seems to be a problem specific to nodemanager, so I'm not able to help you wrt this.



  • I solved the problem.
    The error is in the NodeManager.cpp file in the section below here calculates the average of the detected values.
    Exactly at this point

    // process a float value
      else if (_value_type == TYPE_FLOAT && total > -1)
    

    the program does not send data if the average of the measurements is less than -1.
    Certainly a lapse.
    The average reading of a temperature sensor may also be negative.
    Removed control> -1 and the negative reads sell sent.
    It is necessary to analyze the behavior of the program when a sensor does not work, generating as -127 reading. I did not see if the library already does this check.


  • Contest Winner

    Sorry for the delayed answer! Referencing https://github.com/mysensors/NodeManager/issues/219 to follow the resolution which as I mentioned might be a bit more complex unfortunately 🙂


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