[SOLVED] Getting "check wires" from serial monitor

[843]

Hey all!

I'm terribly new at this and maybe I have totally misunderstood... I want to connect the MQ-2 (gas sensor) and the SHARP GP2Y1010AU0F (dust sensor) through my Arduino one R3 to a raspberry pi 3B to be used in Home Assistant (https://home-assistant.io).

I have used both of these separately and together outputting their data through the serial monitor and it works great. But when I try using any examples from MySensors the output from the serial monitor is always "check wires". I have tried going through the FAQ and the forum to no avail. Can anybody nudge me in the right direction?

Thanks!

[boozz]

The "check wires" message appears if no NRF24L01+ is connected, or if the connections between Arduino and NRF24L01+ is wrong.
In that case you should check these wires / connections

As I have no experience with other antenna's that could be used here my knowledge of this is limited to the NRF24L01+....

BR,

Boozz

[843]

Aaaah, thanks for the quick reply! But I dont want a radio connection. I just want to use the USB directly to the rpi. What to do?

[boozz]

@843

uuuhm, maybe remove the mysensors part?

All examples here are made for the wireless network MySensors is made for, so (unless I completely misunderstood your initial question) you'd take the part that handles the MQ-2 and SHARP sensors from the examples and use it in your own sketch.

BR,

Boozz

[hek]

Remove the #define MY_RADIO_xxx

and add

#define MY_GATEWAY_SERIAL

(if you want to create a serial gateway communicating with HomeAssistant)

[843]

@hek

Thanks for your reply! I was looking for something like that, but I can't get it to work.

Here is the code (i have just combined the MQ and SHARP examples from the MySensors lib)

/*
  Vera Arduino MQ2

  connect the MQ2 sensor as follows :

  A H A   >>> 5V
  B		  >>> A0
  H       >>> GND
  B       >>> 10K ohm >>> GND
  
  Contribution: epierre
  Based on http://sandboxelectronics.com/?p=165
  
  License: Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
 
  Modified by HEK to work in 1.4
*/

/*
  Arduino Dust Sensor

  connect the sensor as follows :

  VCC       >>> 5V
  A         >>> A0
  GND       >>> GND

  Based on: http://www.dfrobot.com/wiki/index.php/Sharp_GP2Y1010AU 
  Authors: Cyrille Médard de Chardon (serialC), Christophe Trefois (Trefex)
  Contribution: epierre
  COnverted to 1.4 by Henrik Ekblad
  
  The dust sensor used (see purchase guide for latest link):
  http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575069610&toolid=10001&campid=5337433187&customid=&icep_item=171259125886&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg
  
*/



//#define MY_GATEWAY_SERIAL

#include <MyConfig.h>
#include <MySensor.h>
#include <SPI.h>
#include <Wire.h>


#define CHILD_ID_DUST 1
#define CHILD_ID_MQ 2 




/************************Hardware Related Macros************************************/
#define         DUST_SENSOR_ANALOG_PIN       (A1)

#define 	MQ_SENSOR_ANALOG_PIN         (A0)  //define which analog input channel you are going to use
#define         RL_VALUE                     (5)     //define the load resistance on the board, in kilo ohms
#define         RO_CLEAN_AIR_FACTOR          (9.83)  //RO_CLEAR_AIR_FACTOR=(Sensor resistance in clean air)/RO,
                                                     //which is derived from the chart in datasheet
/***********************Software Related Macros************************************/
#define         CALIBARAION_SAMPLE_TIMES     (50)    //define how many samples you are going to take in the calibration phase
#define         CALIBRATION_SAMPLE_INTERVAL  (500)   //define the time interal(in milisecond) between each samples in the
                                                     //cablibration phase
#define         READ_SAMPLE_INTERVAL         (50)    //define how many samples you are going to take in normal operation
#define         READ_SAMPLE_TIMES            (5)     //define the time interal(in milisecond) between each samples in 
                                                     //normal operation
/**********************Application Related Macros**********************************/
#define         GAS_LPG                      (0)
#define         GAS_CO                       (1)
#define         GAS_SMOKE                    (2)
/*****************************Globals***********************************************/


unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)
//VARIABLES
float Ro = 10000.0;    // this has to be tuned 10K Ohm
int val = 0;           // variable to store the value coming from the sensor
float valMQ = 0.0;
float lastMQ = 0.0;
float LPGCurve[3]  =  {2.3,0.21,-0.47};   //two points are taken from the curve. 
                                                    //with these two points, a line is formed which is "approximately equivalent"
                                                    //to the original curve. 
                                                    //data format:{ x, y, slope}; point1: (lg200, 0.21), point2: (lg10000, -0.59) 
float COCurve[3]  =  {2.3,0.72,-0.34};    //two points are taken from the curve. 
                                                    //with these two points, a line is formed which is "approximately equivalent" 
                                                    //to the original curve.
                                                    //data format:{ x, y, slope}; point1: (lg200, 0.72), point2: (lg10000,  0.15) 
float SmokeCurve[3] ={2.3,0.53,-0.44};    //two points are taken from the curve. 
                                                    //with these two points, a line is formed which is "approximately equivalent" 
                                                    //to the original curve.
                                                    //data format:{ x, y, slope}; point1: (lg200, 0.53), point2:(lg10000,-0.22)                                                     


int val2 = 0;           // variable to store the value coming from the sensor
float valDUST =0.0;
float lastDUST =0.0;
int samplingTime = 280;
int deltaTime = 40;
int sleepTime = 9680;
float voMeasured = 0;
float calcVoltage = 0;
float dustDensity = 0;



MySensor gw;

MyMessage dustMsg(CHILD_ID_DUST, V_LEVEL);

MyMessage msg(CHILD_ID_MQ, V_LEVEL);


void setup()  
{ 
  
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Multi Air Quality Sensor", "1.0");
  
  // Register all sensors to gateway (they will be created as child devices)
  gw.present(CHILD_ID_DUST, S_DUST);
  
  
  gw.present(CHILD_ID_MQ, S_AIR_QUALITY);  
 
  
  Ro = MQCalibration(MQ_SENSOR_ANALOG_PIN);         //Calibrating the sensor. Please make sure the sensor is in clean air 
  
 //when you perform the calibration  

}

void loop()      
{     
  
  
  
  uint16_t valMQ = MQGetGasPercentage(MQRead(MQ_SENSOR_ANALOG_PIN)/Ro,GAS_CO);
  Serial.println(val);
  
   Serial.print("LPG:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_SENSOR_ANALOG_PIN)/Ro,GAS_LPG) );
   Serial.print( "ppm" );
   Serial.print("    ");   
   Serial.print("CO:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_SENSOR_ANALOG_PIN)/Ro,GAS_CO) );
   Serial.print( "ppm" );
   Serial.print("    ");   
   Serial.print("SMOKE:"); 
   Serial.print(MQGetGasPercentage(MQRead(MQ_SENSOR_ANALOG_PIN)/Ro,GAS_SMOKE) );
   Serial.print( "ppm" );
   Serial.print("\n");
     
  if (valMQ != lastMQ) {
      gw.send(msg.set((int)ceil(valMQ)));
      lastMQ = ceil(valMQ);
  }
  
  //gw.sleep(SLEEP_TIME);
  
  uint16_t voMeasured = analogRead(DUST_SENSOR_ANALOG_PIN);// Get DUST value

  // 0 - 5V mapped to 0 - 1023 integer values
  // recover voltage
  calcVoltage = voMeasured * (5.0 / 1024.0);

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/
  // Chris Nafis (c) 2012
  dustDensity = (0.17 * calcVoltage - 0.1)*1000;
 
  Serial.print("Raw Signal Value (0-1023): ");
  Serial.print(voMeasured);
  
  Serial.print(" - Voltage: ");
  Serial.print(calcVoltage);
  
  Serial.print(" - Dust Density: ");
  Serial.println(dustDensity); // unit: ug/m3
 
  if (ceil(dustDensity) != lastDUST) {
      gw.send(dustMsg.set((int)ceil(dustDensity)));
      lastDUST = ceil(dustDensity);
  }
  
  
  gw.sleep(SLEEP_TIME); //sleep for: sleepTime 
}

/****************** MQResistanceCalculation ****************************************
Input:   raw_adc - raw value read from adc, which represents the voltage
Output:  the calculated sensor resistance
Remarks: The sensor and the load resistor forms a voltage divider. Given the voltage
         across the load resistor and its resistance, the resistance of the sensor
         could be derived.
************************************************************************************/ 
float MQResistanceCalculation(int raw_adc)
{
  return ( ((float)RL_VALUE*(1023-raw_adc)/raw_adc));
}
 
/***************************** MQCalibration ****************************************
Input:   mq_pin - analog channel
Output:  Ro of the sensor
Remarks: This function assumes that the sensor is in clean air. It use  
         MQResistanceCalculation to calculates the sensor resistance in clean air 
         and then divides it with RO_CLEAN_AIR_FACTOR. RO_CLEAN_AIR_FACTOR is about 
         10, which differs slightly between different sensors.
************************************************************************************/ 
float MQCalibration(int mq_pin)
{
  int i;
  float val=0;
 
  for (i=0;i<CALIBARAION_SAMPLE_TIMES;i++) {            //take multiple samples
    val += MQResistanceCalculation(analogRead(mq_pin));
    delay(CALIBRATION_SAMPLE_INTERVAL);
  }
  val = val/CALIBARAION_SAMPLE_TIMES;                   //calculate the average value
 
  val = val/RO_CLEAN_AIR_FACTOR;                        //divided by RO_CLEAN_AIR_FACTOR yields the Ro 
                                                        //according to the chart in the datasheet 
 
  return val; 
}
/*****************************  MQRead *********************************************
Input:   mq_pin - analog channel
Output:  Rs of the sensor
Remarks: This function use MQResistanceCalculation to caculate the sensor resistenc (Rs).
         The Rs changes as the sensor is in the different consentration of the target
         gas. The sample times and the time interval between samples could be configured
         by changing the definition of the macros.
************************************************************************************/ 
float MQRead(int mq_pin)
{
  int i;
  float rs=0;
 
  for (i=0;i<READ_SAMPLE_TIMES;i++) {
    rs += MQResistanceCalculation(analogRead(mq_pin));
    delay(READ_SAMPLE_INTERVAL);
  }
 
  rs = rs/READ_SAMPLE_TIMES;
 
  return rs;  
}
 
/*****************************  MQGetGasPercentage **********************************
Input:   rs_ro_ratio - Rs divided by Ro
         gas_id      - target gas type
Output:  ppm of the target gas
Remarks: This function passes different curves to the MQGetPercentage function which 
         calculates the ppm (parts per million) of the target gas.
************************************************************************************/ 
int MQGetGasPercentage(float rs_ro_ratio, int gas_id)
{
  if ( gas_id == GAS_LPG ) {
     return MQGetPercentage(rs_ro_ratio,LPGCurve);
  } else if ( gas_id == GAS_CO ) {
     return MQGetPercentage(rs_ro_ratio,COCurve);
  } else if ( gas_id == GAS_SMOKE ) {
     return MQGetPercentage(rs_ro_ratio,SmokeCurve);
  }    
 
  return 0;
}
 
/*****************************  MQGetPercentage **********************************
Input:   rs_ro_ratio - Rs divided by Ro
         pcurve      - pointer to the curve of the target gas
Output:  ppm of the target gas
Remarks: By using the slope and a point of the line. The x(logarithmic value of ppm) 
         of the line could be derived if y(rs_ro_ratio) is provided. As it is a 
         logarithmic coordinate, power of 10 is used to convert the result to non-logarithmic 
         value.
************************************************************************************/ 
int  MQGetPercentage(float rs_ro_ratio, float *pcurve)
{
  return (pow(10,( ((log(rs_ro_ratio)-pcurve[1])/pcurve[2]) + pcurve[0])));
}

The only output I'm getting is still just "check wires".

[tbowmo]

It seems that you are not using mysensors 2.0.

If I remember right, the ability to add sensors directly on the GW was first introduced in that release

[843]

@tbowmo

Nice! It worked, its sending data now, but all i get is this. (maybe the problem here is on the HA side)

16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Error decoding message from gateway, bad data received: Sending initial value

16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Node 0 is unknown
16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Node 0 is unknown
16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Error decoding message from gateway, bad data received: Requesting initial value from controller

16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Node 0 is unknown
16-09-08 19:56:11 WARNING (Thread-2) [mysensors.mysensors] Node 0 is unknown
16-09-08 19:56:13 WARNING (Thread-2) [mysensors.mysensors] Error decoding message from gateway, bad data received: 156.33 ug/m3

16-09-08 19:56:13 WARNING (Thread-2) [mysensors.mysensors] Node 0 is unknown
16-09-08 19:56:14 WARNING (Thread-2) [mysensors.mysensors] Error decoding message from gateway, bad data received: LPG: 0ppm    CO: 0ppm    SMOKE: 0ppm

[843]

My mistake! I didn't actually run the presentation code. So I just moved

present(CHILD_ID_DUST, S_DUST); 
present(CHILD_ID_MQ, S_AIR_QUALITY);

to within

void setup()  

and now everything shows up in HA