Then, construct a circuit with arduino uno board. The resistor I using here is 10k ohm but the best would be 1M ohm.
You will need to upload the following sketches:
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#include <CapacitiveSensor.h> CapacitiveSensor cs_4_2 = CapacitiveSensor(4,2); // 10M resistor between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desired CapacitiveSensor cs_4_6 = CapacitiveSensor(4,6); // 10M resistor between pins 4 & 6, pin 6 is sensor pin, add a wire and or foil CapacitiveSensor cs_4_8 = CapacitiveSensor(4,8); // 10M resistor between pins 4 & 8, pin 8 is sensor pin, add a wire and or foil void setup() { cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF); // turn off autocalibrate on channel 1 - just as an example Serial.begin(9600); } void loop() { long start = millis(); long total1 = cs_4_2.capacitiveSensor(30); long total2 = cs_4_6.capacitiveSensor(30); long total3 = cs_4_8.capacitiveSensor(30); Serial.print(total1); // print sensor output 1 Serial.print(","); Serial.print(total2); // print sensor output 2 Serial.print(","); Serial.println(total3); // print sensor output 3 delay(10); // arbitrary delay to limit data to serial port } |
You may further enrich the output using processing + serial.
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import processing.serial.*; int touch1Value = 0; // sensor 1 value int touch2Value = 0; // sensor 2 value int touch3Value = 0; // sensor 3 value int threshold = 30; Serial myPort; void setup() { size(800, 800); // List all the available serial ports println(Serial.list()); // I know that the first port in the serial list on my mac // is always my Arduino, so I open Serial.list()[0]. // Open whatever port is the one you're using. myPort = new Serial(this, Serial.list()[0], 9600); // don't generate a serialEvent() unless you get a newline character: myPort.bufferUntil('\n'); } void draw() { background(0); println("touch1Value:"+touch1Value+" touch2Value:"+touch2Value+" touch3Value"+touch3Value); if(touch1Value == 1) { background(255, 255, 0); } else if(touch2Value == 1) { background(255, 0, 0); } else if(touch3Value == 1) { background(0, 255, 0); } } void serialEvent(Serial myPort) { // get the ASCII string: String inString = myPort.readStringUntil('\n'); if (inString != null) { // trim off any whitespace: inString = trim(inString); // split the string on the commas and convert the // resulting substrings into an integer array: float[] touches = float(split(inString, ",")); // if the array has at least three elements, you know // you got the whole thing. Put the numbers in the // touchX variables: if (touches.length >=3) { touch1Value = touches[0] >= threshold ? 1: 0; touch2Value = touches[1] >= threshold ? 1: 0; touch3Value = touches[2] >= threshold ? 1: 0; } } } |