SOLVED: Two SDI-12 sensors to Arduino Uno

hi
sorry, turned out had made stupid mistake in variable naming. approach works, don't know if elegant sollution :-)
_________________________________________________________
hi everyone

i putting small data logger based on arduino uno r3. want connect 2 sdi-12 sensors logger , have therefore downloaded helpful "arduino-sdi-12" library. can data 1 sensor, not 2 (not if connected same input pin nor 2 different pins). have given sensors 2 different addresses. below code: if comment out related either incoming or outgoing sensor (below have commented part deals incoming sensor), reads data fine 1 sensor. if both uncommented zeros 1 sensor , constant high values other.
my approach in code below has been copy section works 1 sensor , repeat other. perhaps wrong? suggestions welcome solve this.
all best
andreas

code: [select]



/*
written kevin m. smith in 2013.
contact: sdi12@ethosengineering.org
extended ruben kertesz in 2016
*/

#include <sdi12.h>

#define datapin 2         // change proper pin
sdi12 mysdi12(datapin);

string srsout = "";
string srsin = "";
string mycommand = "";
string redoutstring = "";
string niroutstring = "";
string redinstring = "";
string nirinstring = "";
float ndvi = 0;
float redin = 0;
float nirin = 0;
float redout = 0;
float nirout = 0;

void setup() {
  serial.begin(9600);
  mysdi12.begin();
}

void loop() {
//-----------------------------------------------------------------------------------
//grab data outgoing sensor
//first command take measurement
 
  mysdi12.sendcommand("1m!");    // change "1" correct address of sensor
  delay(30);                     // wait while response

  while (mysdi12.available()) {  // build response string
    char c = mysdi12.read();
    if ((c != '\n') && (c != '\r')) {
      srsout += c;
      delay(5);
    }
  }
  if (srsin.length() > 1)
  mysdi12.flush();

  delay(5000);                   // delay between taking reading , requesting data
  srsin = "";                   // clear response string

// next command request data last measurement
  mysdi12.sendcommand("1d0!");   // change "1" appropriate address
  delay(30);                     // wait while response

  while (mysdi12.available()) {  // build string response
    char c = mysdi12.read();
    if ((c != '\n') && (c != '\r')) {
      srsout += c;
      delay(5); //former val = 5
    }
  }
 
//----------------------------------------------------------------------------------- 
  //grab data incoming sensor
  //first command take measurement
//  mycommand = "0m!";             // change "0" correct address of sensor
//  mysdi12.sendcommand(mycommand);
//  delay(30);                     // wait while response
//
//  while (mysdi12.available()) {  // build response string
//    char c = mysdi12.read();
//    if ((c != '\n') && (c != '\r')) {
//      srsin += c;
//      delay(5);
//    }
//  }
//  if (srsout.length() > 1)
//  mysdi12.flush();
//
//  delay(5000);                   // delay between taking reading , requesting data
//  srsout = "";                   // clear response string
//
//// next command request data last measurement
//  mycommand = "0d0!";            // change first 0 appropriate address
////  serial.println(mycommand);   // echo command terminal
//
//  mysdi12.sendcommand(mycommand);
//  delay(30);                     // wait while response
//
//  while (mysdi12.available()) {  // build string response
//    char c = mysdi12.read();
//    if ((c != '\n') && (c != '\r')) {
//      srsin += c;
//      delay(5); //former val = 5
//    }
//  }
// 
//-----------------------------------------------------------------------------------
  //write measurement screen
  redoutstring = srsout.substring(4,9); //pick part of string
  niroutstring = srsout.substring(11,16);
  redout = redoutstring.tofloat(); //string float
  nirout = niroutstring.tofloat();
  redinstring = srsin.substring(4,9); //pick part of string
  nirinstring = srsin.substring(11,16);
  redin = redinstring.tofloat(); //string float
  nirin = nirinstring.tofloat();
  ndvi = (((nirout/nirin) - (redout/redin)) / ((nirout/nirin) + (redout/redin)));
  serial.print("redout: ");
  serial.print(redout, 4);
  serial.print("  nirout: ");
  serial.print(nirout, 4);
 
  serial.print("  redin: ");
  serial.print(redin, 4);
  serial.print("  nirin: ");
  serial.print(nirin, 4);
  serial.println();
  serial.print("ndvi: ");
  serial.print(ndvi);
  serial.println();
 
  mysdi12.flush();
}



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