Trigger an image in interactive installation “sensor input cannot be resolved as a variable”

Processing Electronics (Arduino, etc.)
5

pls can you edit your posts and format the code?
use the

</>   code tag

ok i show you my version for

  • processing IDE 3.5.3 / JAVA mode
  • arduino IDE 1.8.9 nightly
    running on Raspberry Pi 3B+ / Raspbian OS

Arduino:

#include <CapacitiveSensor.h>
// http://playground.arduino.cc/Main/CapacitiveSensor

CapacitiveSensor cs_4_2 = CapacitiveSensor(4, 2);   // (byte sendPin, byte receivePin)
long val_cs_4_2;

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;  // for LEONARDO needed
  }
  Serial.println("0,0,<Arduino is ready>");   // as you expect CSV line and use first value as number
  // cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
}

void loop() {
  val_cs_4_2 = cs_4_2.capacitiveSensor(30);
  Serial.print(val_cs_4_2);                           // -2 is timeout
  Serial.println(",0,");
  delay(10);
}

Processing:

// https://discourse.processing.org/t/help-with-code-please/8800  // kll cleaned version
import processing.serial.*;                             //import the Serial library so can read from arudino input via serial communication
Serial port;                                            // The serial port, this is a new instance of the Serial class (an Object)
String inserial;                                        // declare a new IN string called ‘serial’
int lf = 10;                                            // the number 10 is ASCII for linefeed (end of serial.println),
String[] SensorInput = {"0", "0"};                      // splitted CSV line to string array
PImage zom;
int val_cs_4_2;

void setup() {
  size (500, 500);  //1000,1000
  printArray(Serial.list()); 
  port = new Serial(this, Serial.list()[6], 9600); 
  port.clear();
  zom = loadImage("zom1.jpg");
}

void draw() {
  background(200);
  image(zom, 0, 0, 500, 500);
  if (val_cs_4_2 >= 1000)   background(0);                     // reset screen
  if (val_cs_4_2 == -2)     text("sensor problem", 10, 20);    // warning
}

void serialEvent(Serial p) { 
  inserial = p.readStringUntil(lf);
  if (inserial != null) {                                // if the string is not empty, do this
    SensorInput = split(inserial, ',');                  // capsense Input form Arduino, each value is seperated and split depending on the ‘,’ //and then saved in seperate cells of the array so we can access each
    printArray(SensorInput);                             // can help to print these to console at this point to check it’s working
    val_cs_4_2 = int(SensorInput[0]);                    // the first is our sensor
  }
}

but i get the “-2” timeout as no hardware “sensor” connected.

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