Error in adding element into an array

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hello, I am doing a project of arduino to control the relay switch by using the CapacitiveSensor

i found that there is some error on my array.

not sure is there any problem in my setup for array

please advice thank you,

I am still new in c++ programming

What I have tried:

C++

<pre>#include <CapacitiveSensor.h>

CapacitiveSensor _pianoTiles[] = {};

/*
   * pin2 Piezo's Ports
   * pin3 ~ pin6 Relay Switch's Ports
   */
   
  int _outputPorts[] = {2 , 3 , 4 , 5 , 6}; 

  /*
   * pin10 ~ 13 : capacitiveSensor's Ports
   */

   int _inputPorts[] = {10, 11, 12, 13};

void setup() {

  //boundRate:
  Serial.begin  (9600);

  for ( int inputPorts = 0 ; inputPorts < sizeof( _inputPorts ) - 1 ; inputPorts ++) _pianoTiles[inputPorts] = CapacitiveSensor( 9 , _inputPorts[inputPorts]);

  for ( int outputPorts = 0 ; outputPorts < sizeof( _outputPorts ) - 1 ; outputPorts ++ ) pinMode ( _outputPorts[outputPorts], OUTPUT);

}

void loop() {

  int value[]={};

  for ( int i = 0 ; i < sizeof( _pianoTiles ) - 1 ; i ++ ) value[i] = _pianoTiles[i].capacitiveSensor(30);

  if ( _pianoTiles[0] > 200 ) digitalWrite( 2 , 1 );

}

there is an error on this line :

<pre>if ( _pianoTiles[0] > 200 ) digitalWrite( 2 , 1 );

error message :

Arduino: 1.8.3 Hourly Build 2017/04/14 10:33 (Windows 7), Board: "Arduino/Genuino Uno"

C:\Users\racheal\Desktop\smchProject\smchProject.ino: In function 'void loop()':

smchProject:35: error: no match for 'operator>' (operand types are 'CapacitiveSensor' and 'int')

   if ( _pianoTiles[0] > 200 ) digitalWrite( 2 , 1 );

                       ^

exit status 1
no match for 'operator>' (operand types are 'CapacitiveSensor' and 'int')

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Posted 16-Apr-17 17:50pm

Arnold bin Boon Hoo

Updated 16-Apr-17 22:09pm

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OriginalGriff · Answer 1 · 2017-04-16T22:09:00

The error message is pretty explicit:

no match for 'operator>' (operand types are 'CapacitiveSensor' and 'int')

So look at the code:

if ( _pianoTiles[0] > 200 ) ...

_pianoTilesis declared as an array of CapacitiveSensor objects:

C++

CapacitiveSensor _pianoTiles[] = {};

And 200 is obviously an integer.
The error message is telling you that there is not operator declared which allows the system to tell which of the two object types CapacitiveSensor and integer is the "biggest".

Either define a operator> for CapacitiveSensor that takes an integer, or sort out which part of the CapacitiveSensor you meant to compare.