Tanks. I will not use 10 sensor in the future because with 6 sensor all pin of the 328 is used but could you make me an example of your "constant value line numSoilSamples that is equal to 6" because i think i don't understand.

this is the modified code:

Code:

#include <EasyTransfer.h>

//create object
EasyTransfer ET;

struct SEND_DATA_STRUCTURE{
  //put your variable definitions here for the data you want to send
  //THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO
  int soil[7];

};

//give a name to the group of data
SEND_DATA_STRUCTURE mydata;

void setup(){
  Serial.begin(9600);
  //start the library, pass in the data details and the name of the serial port. Can be Serial, Serial1, Serial2, etc.
  ET.begin(details(mydata), &Serial);

  for(int i=2;i<14;i++){
    pinMode(i,OUTPUT);
    digitalWrite(i, LOW);
  }

  for(int i=0;i<6;i++){
    pinMode(i,INPUT);
  }

}

void loop(){
  //send the data
  for (int i=0;i<6;i++){
    sensorRead(i);
    ET.sendData();
   
  }
}

void sensorRead(int sensor){
  digitalWrite(sensor*2, HIGH);
  digitalWrite(sensor*2+1, LOW);
  delay(1000);
  int val1 = analogRead(sensor-1);
  digitalWrite(sensor*2, LOW);
  digitalWrite(sensor*2+1, HIGH);
  delay(1000);
  int val2 = 1023 - analogRead(sensor-1);
  mydata.soil[sensor] = (val1 + val2) / 2;
  digitalWrite(sensor*2, LOW);
  digitalWrite(sensor*2+1, LOW);
}

Hi, i have a little piece of coding based on EasyTransfer. It's a soil moisture meter that take data and send it to another arduino. The code:

Code:

#include <EasyTransfer.h>

//create object
EasyTransfer ET;

struct SEND_DATA_STRUCTURE{
  //put your variable definitions here for the data you want to send
  //THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO
  int soil1;
  int soil2;
  int soil3;
  int soil4;
  int soil5;
  int soil6;

};

//give a name to the group of data
SEND_DATA_STRUCTURE mydata;

void setup(){
  Serial.begin(9600);
  //start the library, pass in the data details and the name of the serial port. Can be Serial, Serial1, Serial2, etc.
  ET.begin(details(mydata), &Serial);

  for(int i=2;i<=13;i++){
    pinMode(i,OUTPUT);
    digitalWrite(i, LOW);
  }

  for(int i=0;i<=5;i++){
    pinMode(i,INPUT);
  }

}

void loop(){
  for (int i=1;i<=6;i++){
    sensorRead(i);
    ET.sendData();
  }
}

void sensorRead(int sensor){
  digitalWrite(sensor*2, HIGH);
  digitalWrite(sensor*2+1, LOW);
  delay(1000);
  int val1 = analogRead(sensor-1);
  digitalWrite(sensor*2, LOW);
  digitalWrite(sensor*2+1, HIGH);
  delay(1000);
  int val2 = 1023 - analogRead(sensor-1);
  soil[sensor] = (val1 + val1) / 2;
  digitalWrite(sensor*2, LOW);
  digitalWrite(sensor*2+1, LOW);
}

but when i try to compile it i have this error:

Code:

EasyTransfer_TX_Example.cpp: In function 'void sensorRead(int)':
EasyTransfer_TX_Example.pde:-1: error: 'soil' was not declared in this scope

how can i declare the soil[] variable?
tanks

...... maybe... so i make my test with weight/read tu deternine the % of water in the soil and then i enter the value in multimap() (ex: 5%,10%,15% etc...) and the corespondant reading (ex:1000,950,900 etc...) and .....

I want to show in % the soil humidity but Another problem is i dont think the soil resistance increase is linear so maybe i do this for nothing

Check my multiMap() on the playground, it is invented for non linear thingies. See - http://playground.arduino.cc/Main/MultiMap -

(time for a cup of tea

ok i read it but i not sure to understand what i'm reading

I think i will have to do test by soil weight to know the humidity level and the reading according to that!

Yes, (even unisgned int would be too small)

looking at the formula you can work around it as follows too:

Serial.print(100 - (avg2*10/101) );  // removed a common factor 10

avg2 *10 is max 10000, divided by 101 is 99 or so all within int range


Q: why divide by 101? what is the range you expect in the print? 1..100 or 0..100?

1010 it's the Max of what i can read with the sensor... I want to show in % the soil humidity but Another problem is i dont think the soil resistance increase is linear so maybe i do this for nothing

there is an int overflow, make all constants long by adding the L modifier to them

Serial.print(100L - (avg2*100L/1010L) );

Tanks, that work but now to want to know why ....
The biggest number i have in this formula is 100000 (avg2*100) ... That's why i have this problem due to integer limitation of 32767??

.... Another question ... Why when i wrote that:

Code:

Serial.print(100-(avg2*100/1010));

If avg2=1000, I receive 130 ... ???

Only the define of sensorPin has changed ....

Code:

#define voltageFlipPin11 2
#define voltageFlipPin12 3
#define voltageFlipPin21 4
#define voltageFlipPin22 6
#define voltageFlipPin31 7
#define voltageFlipPin32 8
#define voltageFlipPin41 9
#define voltageFlipPin42 11
#define sensorPin1 A4
#define sensorPin2 A2
#define sensorPin3 A1
#define sensorPin4 A0

int flipTimer = 1000;
int currentsensor=1;
int val11;
int val12;
int avg1;
int val21;
int val22;
int avg2;
int val31;
int val32;
int avg3;
int val41;
int val42;
int avg4;

void setup(){
  Serial.begin(9600);
  pinMode(voltageFlipPin11, OUTPUT);
  pinMode(voltageFlipPin12, OUTPUT);
  pinMode(voltageFlipPin21, OUTPUT);
  pinMode(voltageFlipPin22, OUTPUT);
  pinMode(voltageFlipPin31, OUTPUT);
  pinMode(voltageFlipPin32, OUTPUT);
  pinMode(voltageFlipPin41, OUTPUT);
  pinMode(voltageFlipPin42, OUTPUT);
  digitalWrite(voltageFlipPin11, LOW);
  digitalWrite(voltageFlipPin12, LOW);
  digitalWrite(voltageFlipPin21, LOW);
  digitalWrite(voltageFlipPin22, LOW);
  digitalWrite(voltageFlipPin31, LOW);
  digitalWrite(voltageFlipPin32, LOW);
  digitalWrite(voltageFlipPin41, LOW);
  digitalWrite(voltageFlipPin42, LOW);
  pinMode(sensorPin1, INPUT);
  pinMode(sensorPin2, INPUT);
  pinMode(sensorPin3, INPUT);
  pinMode(sensorPin4, INPUT);
}

void loop(){
  switch (currentsensor){

  case 1:
    digitalWrite(voltageFlipPin11, HIGH);
    digitalWrite(voltageFlipPin12, LOW);
    delay(flipTimer);
    val11 = analogRead(sensorPin1);
    delay(flipTimer);
    digitalWrite(voltageFlipPin11, LOW);
    digitalWrite(voltageFlipPin12, HIGH);
    delay(flipTimer);
    val12 = 1023 - analogRead(sensorPin1);
    avg1 = (val11 + val12) / 2;
    digitalWrite(voltageFlipPin11, LOW);
    digitalWrite(voltageFlipPin12, LOW);
    ++currentsensor;
    break;

  case 2:
    digitalWrite(voltageFlipPin21, HIGH);
    digitalWrite(voltageFlipPin22, LOW);
    delay(flipTimer);
    val21 = analogRead(sensorPin2);
    delay(flipTimer);
    digitalWrite(voltageFlipPin21, LOW);
    digitalWrite(voltageFlipPin22, HIGH);
    delay(flipTimer);
    val22 = 1023 - analogRead(sensorPin2);
    avg2 = (val21 + val22) / 2;
    digitalWrite(voltageFlipPin21, LOW);
    digitalWrite(voltageFlipPin22, LOW);
    ++currentsensor;
    break;

  case 3:
    digitalWrite(voltageFlipPin31, HIGH);
    digitalWrite(voltageFlipPin32, LOW);
    delay(flipTimer);
    val31 = analogRead(sensorPin3);
    delay(flipTimer);
    digitalWrite(voltageFlipPin31, LOW);
    digitalWrite(voltageFlipPin32, HIGH);
    delay(flipTimer);
    val32 = 1023 - analogRead(sensorPin3);
    avg3 = (val31 + val32) / 2;
    digitalWrite(voltageFlipPin31, LOW);
    digitalWrite(voltageFlipPin32, LOW);
    ++currentsensor;
    break;

  case 4:
    digitalWrite(voltageFlipPin41, HIGH);
    digitalWrite(voltageFlipPin42, LOW);
    delay(flipTimer);
    val41 = analogRead(sensorPin4);
    delay(flipTimer);
    digitalWrite(voltageFlipPin41, LOW);
    digitalWrite(voltageFlipPin42, HIGH);
    delay(flipTimer);
    val42 = 1023 - analogRead(sensorPin4);
    avg4 = (val41 + val42) / 2;
    digitalWrite(voltageFlipPin41, LOW);
    digitalWrite(voltageFlipPin42, LOW);
    ++currentsensor;
    break;

  case 5:
    Serial.print("Sensor Value #1: ");
    Serial.println(avg1);
    Serial.println();
    Serial.print("Sensor Value #2: ");
    Serial.println(avg2);
    Serial.println();
    Serial.print("Sensor Value #3: ");
    Serial.println(avg3);
    Serial.println();
    Serial.print("Sensor Value #4: ");
    Serial.println(avg4);
    Serial.println("-----------------------");
     Serial.print("Average Sensor Value: ");
    Serial.println((avg1+avg2+avg3+avg4)/4);
    Serial.println();
    Serial.println();
    currentsensor=1;
    break;

  }

}

... and the sensorPin suppose to be A0, A1 like robtillaart said ... Hardware serial is digital pin not analog no? So no conflict !

#define voltageFlipPin11 2
#define voltageFlipPin21 4

conflicts with these pins ?

#define sensorPin1 4
#define sensorPin2 2

IIRC Analog pins should be addressed as A0 A1 A2 A4 etc.

Tanks a lot ... That's the problem... All works well now!!

I try nearly all analog pin combinations and i dont even see a patern... Random number on random pins... Maybe limitation with the A/D ...???

tanks for the script, yes it's simpler but i have the same problem .... i cannot use 4 sensor at same time, i can read 3 but when i add one it give me bad read ....

Ok ... i change the analogPin definition and it seem to work in water. When i remove it and let the sensor in the air sensor #3 and #4 give me nearly 1024 that's ok but #1 and #2 give me random number between 600 and 800... ... i use pin 4, pin 2, pin 1 and pin 0. I really don't understand why analogPin works all fine but in this sketch some AnalogPin and DigitalPin, when they are used, give me error (DigitalPin= Not enough current, AnalogPin= Bad read value) ....

 Here the sketch(Translate from french to english) :

Code:

#define voltageFlipPin11 2
#define voltageFlipPin12 3
#define voltageFlipPin21 4
#define voltageFlipPin22 6
#define voltageFlipPin31 7
#define voltageFlipPin32 8
#define voltageFlipPin41 9
#define voltageFlipPin42 11
#define sensorPin1 4
#define sensorPin2 2
#define sensorPin3 1
#define sensorPin4 0

int flipTimer = 1000;
int currentsensor=1;
int val11;
int val12;
int avg1;
int val21;
int val22;
int avg2;
int val31;
int val32;
int avg3;
int val41;
int val42;
int avg4;

void setup(){
  Serial.begin(9600);
  pinMode(voltageFlipPin11, OUTPUT);
  pinMode(voltageFlipPin12, OUTPUT);
  pinMode(voltageFlipPin21, OUTPUT);
  pinMode(voltageFlipPin22, OUTPUT);
  pinMode(voltageFlipPin31, OUTPUT);
  pinMode(voltageFlipPin32, OUTPUT);
  pinMode(voltageFlipPin41, OUTPUT);
  pinMode(voltageFlipPin42, OUTPUT);
  digitalWrite(voltageFlipPin11, LOW);
  digitalWrite(voltageFlipPin12, LOW);
  digitalWrite(voltageFlipPin21, LOW);
  digitalWrite(voltageFlipPin22, LOW);
  digitalWrite(voltageFlipPin31, LOW);
  digitalWrite(voltageFlipPin32, LOW);
  digitalWrite(voltageFlipPin41, LOW);
  digitalWrite(voltageFlipPin42, LOW);
  pinMode(sensorPin1, INPUT);
  pinMode(sensorPin2, INPUT);
  pinMode(sensorPin3, INPUT);
  pinMode(sensorPin4, INPUT);
}

void loop(){
  switch (currentsensor){

  case 1:
    digitalWrite(voltageFlipPin11, HIGH);
    digitalWrite(voltageFlipPin12, LOW);
    delay(flipTimer);
    val11 = analogRead(sensorPin1);
    delay(flipTimer);
    digitalWrite(voltageFlipPin11, LOW);
    digitalWrite(voltageFlipPin12, HIGH);
    delay(flipTimer);
    val12 = 1023 - analogRead(sensorPin1);
    avg1 = (val11 + val12) / 2;
    digitalWrite(voltageFlipPin11, LOW);
    digitalWrite(voltageFlipPin12, LOW);
    ++currentsensor;
    break;

  case 2:
    digitalWrite(voltageFlipPin21, HIGH);
    digitalWrite(voltageFlipPin22, LOW);
    delay(flipTimer);
    val21 = analogRead(sensorPin2);
    delay(flipTimer);
    digitalWrite(voltageFlipPin21, LOW);
    digitalWrite(voltageFlipPin22, HIGH);
    delay(flipTimer);
    val22 = 1023 - analogRead(sensorPin2);
    avg2 = (val21 + val22) / 2;
    digitalWrite(voltageFlipPin21, LOW);
    digitalWrite(voltageFlipPin22, LOW);
    ++currentsensor;
    break;

  case 3:
    digitalWrite(voltageFlipPin31, HIGH);
    digitalWrite(voltageFlipPin32, LOW);
    delay(flipTimer);
    val31 = analogRead(sensorPin3);
    delay(flipTimer);
    digitalWrite(voltageFlipPin31, LOW);
    digitalWrite(voltageFlipPin32, HIGH);
    delay(flipTimer);
    val32 = 1023 - analogRead(sensorPin3);
    avg3 = (val31 + val32) / 2;
    digitalWrite(voltageFlipPin31, LOW);
    digitalWrite(voltageFlipPin32, LOW);
    ++currentsensor;
    break;

  case 4:
    digitalWrite(voltageFlipPin41, HIGH);
    digitalWrite(voltageFlipPin42, LOW);
    delay(flipTimer);
    val41 = analogRead(sensorPin4);
    delay(flipTimer);
    digitalWrite(voltageFlipPin41, LOW);
    digitalWrite(voltageFlipPin42, HIGH);
    delay(flipTimer);
    val42 = 1023 - analogRead(sensorPin4);
    avg4 = (val41 + val42) / 2;
    digitalWrite(voltageFlipPin41, LOW);
    digitalWrite(voltageFlipPin42, LOW);
    ++currentsensor;
    break;

  case 5:
    Serial.print("Sensor Value #1: ");
    Serial.println(avg1);
    Serial.println();
    Serial.print("Sensor Value #2: ");
    Serial.println(avg2);
    Serial.println();
    Serial.print("Sensor Value #3: ");
    Serial.println(avg3);
    Serial.println();
    Serial.print("Sensor Value #4: ");
    Serial.println(avg4);
    Serial.println("-----------------------");
     Serial.print("Average Sensor Value: ");
    Serial.println((avg1+avg2+avg3+avg4)/4);
    Serial.println();
    Serial.println();
    currentsensor=1;
    break;

  }

}

ok ... i juste try the modification on the sketch but same problem ....

This is what i receive in the Serial monitor when all the sensor is in water.... It's not a sensor problem because if i switch it i have the same result:

Code:

Valeur sensor #1: 646

Valeur sensor #2: 15

Valeur sensor #3: 12

Valeur sensor #4: 15
-----------------------
Valeur moyenne de tout les sensors: 172