Living Architecture Fall 2009 Pratt

1.

inline void digitalPullup(byte pin, boolean b) { pinMode(pin, INPUT); digitalWrite(pin, b?HIGH:LOW); }
#if defined(__AVR_ATmega1280__)
inline void analogPullup(byte pin, boolean b) { digitalPullup(pin+54,b); }
#else
inline void analogPullup(byte pin, boolean b) { digitalPullup(pin+14,b); }
#endif

void setup() {
Serial.begin(9600);
pinMode(clearred, OUTPUT);
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);

analogPullup(0, true); // enable the 20kOhm pull-up on analog pin 0
}

void loop() {
// read the analog input into a variable:
int analogValue = analogRead(0);
// print the result:
Serial.println(analogValue);
// wait 10 milliseconds for the analog-to-digital converter
// to settle after the last reading:
delay(200); //slow enough to examine the values. Yell registers higher than 500 at about 1023.
}

potential processing code (with amplifier:LM386, an op-amp):

/*
* Monitor for sound sensor
*/

int potPin = 2; // select the input pin for sound sensor
int ledPin = 13; // select the pin for the LED
int val = 0;
int amp = 0;

void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
}

void loop() {
val = analogRead(potPin);
amp = (val >= 512) ? val - 512 : 512 - val;
if (amp > 100) {
digitalWrite(ledPin, HIGH);
delay(20);
}
else {
digitalWrite(ledPin, LOW);
}
}