rhoadley.net music research software blogs
aru seminars m&t critski focm1a cmc circuit bending mic2b sensor technology comp 3 sonic art major project
youtube vimeo facebook
Task 8 | Name: Triggering and modulating events | Set: w5i | Due: Monday 19th December 2016 | Weighting: assessable (10%) | Courses: stech |
Prev Task: Investigating sensors - Make your own sensor - Make your own arduino | Next Task: Advanced sensors | ||||
Task Summary | All stech tasks |
Real-life examples of triggering and modulating events.
// Gagglina v01 // 110301 // Based on GaggleSingle v003 // Now works via one routine // just the one ping, for testing... int myDel = 5; void setup() { Serial.begin(115200); } void loop() { ping(2); // ping(3); // ping(4); // ping(5); // ping(6); // ping(7); // ping(8); // ping(9); // ping(10); } void ping(int pingPin) { long duration; float cm; // The PING))) is triggered by a HIGH pulse of 2 or more microseconds. // We 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); Serial.print(pingPin); Serial.print(", "); Serial.println(duration); // Serial.print(", "); // Serial.println(myDel); // convert the time into a distance /* cm = microsecondsToCentimeters(duration); Serial.print("a: "); Serial.print(cm); Serial.print("cm"); Serial.println(); */ // control the rate via a pingPin // these need ranging, so there's are ranges of difference between one 'range' and another. // if (pingPin == 8) { myDel = map(duration, 0, 15000, 500, 20) ; } delay(myDel); } 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; }
Here is a working Max patch: http://rhoadley.org/courses/tech_resources/stech/tasks/triggers/triggering.zip