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// IMA NYU Shanghai | |
// Interaction Lab | |
/** | |
This example is to send multiple values from Processing to Arduino. | |
You can find the Processing example file in the same folder which works with this Arduino file. | |
Please note that the echo case (when char c is 'e' in the getSerialData function below) | |
checks if Arduino is receiving the correct bytes from the Processing sketch | |
by sending the values array back to the Processing sketch. | |
**/ | |
#define NUM_OF_VALUES 2 /** YOU MUST CHANGE THIS ACCORDING TO YOUR PROJECT **/ | |
/** DO NOT REMOVE THESE **/ | |
int tempValue = 0; | |
int valueIndex = 0; | |
/* This is the array of values storing the data from Processing. */ | |
int values[NUM_OF_VALUES]; | |
void setup() { | |
Serial.begin(9600); | |
} | |
void loop() { | |
getSerialData(); | |
tone(13,values[0],values[1]); | |
// add your code here | |
// use elements in the values array | |
// values[0] | |
// values[1] | |
} | |
//recieve serial data from Processing | |
void getSerialData() { | |
if (Serial.available()) { | |
char c = Serial.read(); | |
//switch - case checks the value of the variable in the switch function | |
//in this case, the char c, then runs one of the cases that fit the value of the variable | |
//for more information, visit the reference page: https://www.arduino.cc/en/Reference/SwitchCase | |
switch (c) { | |
//if the char c from Processing is a number between 0 and 9 | |
case '0'...'9': | |
//save the value of char c to tempValue | |
//but simultaneously rearrange the existing values saved in tempValue | |
//for the digits received through char c to remain coherent | |
//if this does not make sense and would like to know more, send an email to me! | |
tempValue = tempValue * 10 + c - '0'; | |
break; | |
//if the char c from Processing is a comma | |
//indicating that the following values of char c is for the next element in the values array | |
case ',': | |
values[valueIndex] = tempValue; | |
//reset tempValue value | |
tempValue = 0; | |
//increment valuesIndex by 1 | |
valueIndex++; | |
break; | |
//if the char c from Processing is character 'n' | |
//which signals that it is the end of data | |
case 'n': | |
//save the tempValue | |
//this will b the last element in the values array | |
values[valueIndex] = tempValue; | |
//reset tempValue and valueIndex values | |
//to clear out the values array for the next round of readings from Processing | |
tempValue = 0; | |
valueIndex = 0; | |
break; | |
//if the char c from Processing is character 'e' | |
//it is signalling for the Arduino to send Processing the elements saved in the values array | |
//this case is triggered and processed by the echoSerialData function in the Processing sketch | |
case 'e': // to echo | |
for (int i = 0; i < NUM_OF_VALUES; i++) { | |
Serial.print(values[i]); | |
if (i < NUM_OF_VALUES - 1) { | |
Serial.print(','); | |
} | |
else { | |
Serial.println(); | |
} | |
} | |
break; | |
} | |
} | |
} |
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// IMA NYU Shanghai | |
// Interaction Lab | |
/** | |
* This example is to send multiple values from Processing to Arduino. | |
* You can find the arduino example file in the same folder which works with this Processing file. | |
* Please note that the echoSerialData function asks Arduino to send the data saved in the values array | |
* to check if it is receiving the correct bytes. | |
**/ | |
import processing.serial.*; | |
int NUM_OF_VALUES = 2; /** YOU MUST CHANGE THIS ACCORDING TO YOUR PROJECT **/ | |
int PORT_INDEX=7; | |
Serial myPort; | |
String myString; | |
// This is the array of values you might want to send to Arduino. | |
int values[] = new int[NUM_OF_VALUES]; | |
void setup() { | |
size(500, 500); | |
background(0); | |
printArray(Serial.list()); | |
myPort = new Serial(this, Serial.list()[ PORT_INDEX ], 9600); | |
// check the list of the ports, | |
// find the port "/dev/cu.usbmodem----" or "/dev/tty.usbmodem----" | |
// and replace PORT_INDEX above with the index of the port | |
myPort.clear(); | |
// Throw out the first reading, | |
// in case we started reading in the middle of a string from the sender. | |
myString = myPort.readStringUntil( 10 ); // 10 = '\n' Linefeed in ASCII | |
myString = null; | |
} | |
void draw() { | |
background(0); | |
// changes the values | |
values[0]=mouseX; | |
values[1]=mouseY; | |
sendSerialData(); | |
// This causess the communication to become slow and unstable. | |
// You might want to comment this out when everything is ready. | |
// The parameter 200 is the frequency of echoing. | |
// The higher this number, the slower the program will be | |
// but the higher this number, the more stable it will be. | |
echoSerialData(200); | |
} | |
void sendSerialData() { | |
String data = ""; | |
for (int i=0; i<values.length; i++) { | |
data += values[i]; | |
//if i is less than the index number of the last element in the values array | |
if (i < values.length-1) { | |
data += ","; // add splitter character "," between each values element | |
} | |
//if it is the last element in the values array | |
else { | |
data += "n"; // add the end of data character "n" | |
} | |
} | |
//write to Arduino | |
myPort.write(data); | |
} | |
void echoSerialData(int frequency) { | |
//write character 'e' at the given frequency | |
//to request Arduino to send back the values array | |
if (frameCount % frequency == 0) myPort.write('e'); | |
String incomingBytes = ""; | |
while (myPort.available() > 0) { | |
//add on all the characters received from the Arduino to the incomingBytes string | |
incomingBytes += char(myPort.read()); | |
} | |
//print what Arduino sent back to Processing | |
print( incomingBytes ); | |
} | |
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