need help with node not sending info

  • Hello,
    I have just make my "2AA slim node" and in the serial monitor here is what I obtain :

    send: 90-90-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=fail:0
    send: 90-90-0-0 s=255,c=0,t=18,pt=0,l=5,sg=0,st=fail:1.5.4
    send: 90-90-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=fail:0
    repeater started, id=90, parent=0, distance=1
    send: 90-90-0-0 s=255,c=3,t=11,pt=0,l=13,sg=0,st=fail:Temp Sens Bat
    send: 90-90-0-0 s=255,c=3,t=12,pt=0,l=3,sg=0,st=ok:1.3
    send: 90-90-0-0 s=1,c=0,t=23,pt=0,l=0,sg=0,st=fail:
    send: 90-90-0-0 s=2,c=0,t=23,pt=0,l=0,sg=0,st=fail:
    send: 90-90-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=ok:
    send: 90-90-0-0 s=1,c=1,t=24,pt=7,l=5,sg=0,st=fail:230.0
    send: 90-90-0-0 s=2,c=1,t=25,pt=7,l=5,sg=0,st=fail:4.958
    send: 90-90-0-0 s=0,c=1,t=0,pt=7,l=5,sg=0,st=fail:20.1

    Can someone help me ?
    Thanks 🙂

  • Hardware Contributor

    Hi @carmelo42

    "st=fail" means the receiving node or gateway has problems sending ack back to the sending node.

    Its probably a hardware issue (power and/or range). Try adding a capacitor ( to the receiving radio, change powersource, move receiver/sender closer to eachother or build a repeater. If you think its a software issue you can try to clear the eeprom ( and reupload your sketch.

  • @sundberg84 thanks 🙂

    All my nodes (and GW, pretty sure) have already decoupling capacitors ...

    I'm using "standard" temperature sketch :

     * 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 <>
     * Copyright (C) 2013-2015 Sensnology AB
     * Full contributor list:
     * Documentation:
     * Support Forum:
     * 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.
     * Example sketch showing how to send in DS1820B OneWire temperature readings back to the controller
    #include <MySensor.h>  
    #include <SPI.h>
    #include <DallasTemperature.h>
    #include <OneWire.h>
    #include <Vcc.h>
    #define COMPARE_TEMP 0 // Send temperature only if changed? 1 = Yes 0 = No
    #define ID_BatPcnt 1
    #define ID_Bat 2
    int node_id = 93; // on donne un ID au node
    const float VccMin   = 1.6;             // Vcc mini attendu, en Volts.
    const float VccMax   = 3.06;           // Vcc Maximum attendu, en Volts (2 piles AA neuves)
    const float VccCorrection = 2.52/2.6; // calibration : Vcc mesuré au multimètre / Vcc mesuré par l'Arduino par vcc.Read_Volts() dans sketch 1/2
    Vcc vcc(VccCorrection);
    #define ONE_WIRE_BUS 3 // Pin where dallase sensor is connected 
    #define MAX_ATTACHED_DS18B20 16
    unsigned long SLEEP_TIME = 15000; // Sleep time between reads (in milliseconds)900000 15 minutes - 600000 10 minutes
    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. 
    MySensor gw;
    MyMessage msgBAT_PCNT(ID_BatPcnt,V_VAR1); // on utilise le type V_VAR1 pour le % de charge des piles
    MyMessage msgBAT(ID_Bat,V_VAR2);          // on utilise le type V_VAR2 pour la tension des piles
    float lastTemperature[MAX_ATTACHED_DS18B20];
    int numSensors=0;
    boolean receivedConfig = false;
    boolean metric = true; 
    // Initialize temperature message
    MyMessage msg(0,V_TEMP);
    void setup()  
      // Startup up the OneWire library
      // requestTemperatures() will not block current thread
      // Startup and initialize MySensors library. Set callback for incoming messages. 
      gw.begin(NULL, node_id, true);
      // Send the sketch version information to the gateway and Controller
      gw.sendSketchInfo("Temp Sens Bat", "1.3");
      // Fetch the number of attached temperature sensors  
      numSensors = sensors.getDeviceCount();
      // Present all sensors to controller
      gw.present(ID_BatPcnt, S_CUSTOM);  // type S_CUSTOM pour le capteur "% de charge"
      gw.present(ID_Bat, S_CUSTOM);      // type S_CUSTOM pour le capteur "tension"
      for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) {   
         gw.present(i, S_TEMP);
    void loop()     
      // Process incoming messages (like config from server)
    // mesure de Vcc
          float v = vcc.Read_Volts();
          // calcul du % de charge batterie
          float p = 100 * ((v - VccMin) / (VccMax - VccMin));
          // On envoie les données des capteurs et de l'état de la batterie au Gateway
          //gw.sendBatteryLevel(p);  // Inutile...
          gw.send(msgBAT_PCNT.set(p, 1)); // 1 décimale
          gw.send(msgBAT.set(v, 3));      // 2 décimales
      // Fetch temperatures from Dallas sensors
      // 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)
      // 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>((gw.getConfig().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) {
        if (temperature != -127.00 && temperature != 85.00) {
          // Send in the new temperature
          // Save new temperatures for next compare

  • Hardware Contributor

    @carmelo42 - sounds good, but there are issues with your radio since you get st=fail. Check my advice in the first post and see if something helps you.

  • I have cleaned the eeprom last night after your advice, and the node is currently at 50 centimeters from the GW. (I have also changed the power source for the node : I was using 1 x CR2032 battery, but last night I have used 2 brand new AA batteries)

    On my Slim AA Node, I have not the C5 cap, I will add it ...

    Can it be a bootoloader issue ? (I'm using my Atmega at 8 Mhz)

  • Hardware Contributor

    @carmelo42 - st:fail is most probalblt not a bootloader issue.
    50cm? Have you tried separating them? Some radios doesnt like when they are to close to eachother. Also try another radio if possible.

  • yes, I have tried 15 meters away : same problem

  • I have added the C5 capacitor (on the "My Slim 2AA node"), and replaced the nrf24 from my GW with a NRF24L01+PA+LNA.

    It's way better 🙂

    So far, no problem .. I will keep you updated in the following days

    Anyway, thanks for your help 💃

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