by on Intermediate Arduino Class

/* Ping))) Sensor

This sketch reads a PING))) ultrasonic rangefinder and returns the
distance to the closest object in range. To do this, it sends a pulse
to the sensor to initiate a reading, then listens for a pulse
to return. The length of the returning pulse is proportional to
the distance of the object from the sensor.

The circuit:
* +V connection of the PING))) attached to +5V
* GND connection of the PING))) attached to ground
* SIG connection of the PING))) attached to digital pin 7

http://www.arduino.cc/en/Tutorial/Ping

created 3 Nov 2008
by David A. Mellis
modified 30 Aug 2011
by Tom Igoe

This example code is in the public domain.

*/
byte pattern[]={
B11111111,
B01111111,
B00111111,
B00011111,
B00001111,
B00000111,
B00000011,
B00000001,
B00000000,

};
byte pattern2[]={
B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,
B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,
B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
B00100010,B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B10110101,
B01010110,B10101110,B10010010,B11011100,B10101100,B01010000,B10101110,B00100010,B10001010,
B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B01010110,B10011010,
B10101110,B10010010,B01101100,B10101100,B01010000,B10101110,B00100010,B00010010,B01100101,
B11011100,B10101100,B10101110,B01010000,B00000001,B10101000,B01010110,B10101110,B10100000,
B00100010,B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B01101001,
B01010110,B10101110,B10010010,B11011100,B10101100,B01010000,B10101110,B00100010,B10100110,
B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B01010110,B10100110,
B10101110,B10010010,B01101100,B10101100,B01010000,B10101110,B00100010,B00010010,B10110001,
B11011100,B10101100,B10101110,B01010000,B00000001,B10101000,B01010110,B10101110,B11101101,
B10010010,B01101110,B10101100,B01010000,B10101110,B00000000,B00000000,B00000000,B00100010,
B00100010,B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B10110101,
B11011100,B10101100,B10101110,B01010000,B00000001,B10101000,B01010110,B10101110,B10100000,
B00100010,B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B01101001,
B01010110,B10101110,B10010010,B11011100,B10101100,B01010000,B10101110,B00100010,B10100110,
B00100010,B11011100,B10101100,B10101110,B01010000,B00000011,B10101000,B01010110,B10100110,
B10101110,B10010010,B01101100,B10101100,B01010000,B10101110,B00100010,B00010010,B10110001,
B11011100,B10101100,B10101110,B01010000,B00000001,B10101000,B01010110,B10101110,B11101101,
B10010010,B01101110,B10101100,B01010000,B10101110,B00000000,B00000000,B00000000,B00100010,
B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,B11111111,
B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,

};
#define NUM_REGISTERS 8
#define MAX_PATTERN (((sizeof(pattern2)/sizeof(byte))/NUM_REGISTERS) -2 )
//#define MAX_PATTERN (sizeof(pattern2)/sizeof(byte))
// this constant won't change. It's the pin number
// of the sensor's output:
const int pingPin = 7;
#define CLOCK 12
#define LATCH 8
#define DATA 10
void setup() {
// initialize serial communication:
Serial.begin(57600);
pinMode(CLOCK,OUTPUT);
pinMode (LATCH, OUTPUT);
pinMode ( DATA,OUTPUT);
}
long int lastMovement=0;
long int lastDistance=0;
void loop()
{
// establish variables for duration of the ping,
// and the distance result in inches and centimeters:
long duration, inches, cm;
int output,rn;

// The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);

// The same pin is used to read the signal from the PING))): a HIGH
// pulse whose duration is the time (in microseconds) from the sending
// of the ping to the reception of its echo off of an object.
pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);

// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
if ( cm 125)cm=125;
if (lastDistance != cm) {
lastDistance=cm;
lastMovement=millis();
}
Serial.print(cm);
Serial.print(" cm, ");
output=map(cm,0,125,0,MAX_PATTERN);
Serial.print(output);

// Serial.print(cm);
digitalWrite (LATCH, LOW);
//shiftOut(DATA,CLOCK,LSBFIRST,~(1<>cm));
//delay(1000);
for (rn=0;rn 2000) {
delay(60); // one thing to try. //output=MAX_PATTERN+1;
} else {
delay(100+random(200));
}

}

long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}

long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}

by on Arduino

Light sculpture hooked up to the ping and software from my last project.
It would be great if we could have a little group show at PNCA. I could bring this piece and the last class project.

by on Arduino

I made a mock-up in Max for LED control. Here’s a screenshot.
LED-Mockup-Max

I’m porting it to PD but in the meantime I am starting to work with Neopixel strips from AdaFruit and they have built in libraries for Arduino, so I will probably put this PD port on hold until I figure out which route to go.

by on Intermediate Arduino Class

The simplest interaction between the arduino and pure data is by using the comport object in pure data and sending data to it using the Arduino’s Serial object. Below is an illustration of two way communication between pure data and the arduino.  On the right the comport object receives values as bytes and puts them on the first vslider. The values from the second slider are sent to the comport. On the left you can see the code for the arduino. The arduino reads the potentiometer and if the value has changed writes the value (scaled to fit in a byte) to the serial port. Then it checks to see if a value has been sent to it and if its different from the last value it sets the led pins pwm value accordingly.

 

8 bit wonder comms

 

by on Intermediate Arduino Class

My idea is still tentative, but I really want to take advantage of the leap motion sensors input capabilities.

For now, I was thinking of hooking up each sensor to a separate servo motor with something interesting attached to each.

If I can’t think of anything meaningful to append to the servos, I will make the outputs trigger some kind of sample via MIDI.

If I go the MIDI route, I will try to use the gesture library to save patterns and do something interesting with that.

Here is a leap motion promo video for anybody interested: https://www.youtube.com/watch?v=_d6KuiuteIA