Lab #3
first research:
The Piezo or knock sensor is a little disk that detects sound over a certain threshold.
Now for the sensor experiments.. I was able to get the light sensor to read in a variety of configurations.. The potentiometer I had (at home) kept falling off the breadboard ..it worked but was unstable so did not video it. The photocell was much better and got two to work.. just worked with fade and calibrating but understand smoothing and mapping..
here is some code and video..
nt buttonPinA = 8; //set buttonpin#
int buttonPinB = 9; //set buttonpin#
int buttonPinC = 10; //set buttonpin#
int sensorValue = 0; // the sensor value
int sensorMin = 1023; // minimum sensor value
int sensorMax = 0; // maximum sensor value
const int ledPin = 5; //set ledpin#
const int sensorPin = A0; // pin that the sensor is attached to
byte leds = 0;
void setup() {
pinMode(ledPin, OUTPUT); //led output
pinMode(buttonPinA, INPUT_PULLUP); //button input
pinMode(buttonPinB, INPUT_PULLUP); //button input
pinMode(buttonPinC, INPUT_PULLUP); //button input
//digitalWrite(buttonPin,HIGH);
// turn on LED to signal the start of the calibration period:
pinMode(13, OUTPUT);
digitalWrite(13, HIGH);
// calibrate during the first five seconds
while (millis() < 5000) {
sensorValue = analogRead(sensorPin);
// record the maximum sensor value
if (sensorValue > sensorMax) {
sensorMax = sensorValue;
}
// record the minimum sensor value
if (sensorValue < sensorMin) {
sensorMin = sensorValue;
}
}
// signal the end of the calibration period
digitalWrite(13, LOW);
}
void loop() {
// read the sensor:
sensorValue = analogRead(sensorPin);
// apply the calibration to the sensor reading
sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
// in case the sensor value is outside the range seen during calibration
sensorValue = constrain(sensorValue, 0, 255);
// fade the LED using the calibrated value:
analogWrite(ledPin, sensorValue);
//buttonState = digitalRead(buttonPin); //read state of button
if (digitalRead(buttonPinA) == LOW)
{
digitalWrite(ledPin, HIGH);
}
// else{
//turn led off
if (digitalRead(buttonPinB) == LOW)
{
digitalWrite(ledPin, LOW);
}
if (digitalRead(buttonPinC ) == LOW)
{
digitalWrite(ledPin, HIGH);
}
}
and another which I put in a little left over box project to finally finish it.. was able to connect 9V battery so no wires ma!
//Pins:
int sensorPin = 0;
int lightPin = 2;
int lightState = 0;
int lowThreshold = 8;
int highThreshold = 20;
void setup() {
//start serial & set pin to output
Serial.begin(9600);
pinMode(lightPin,OUTPUT);
}
void loop(){
//read the sensor pin:
int sensorValue = analogRead(sensorPin);
//if light level low switch light on
Serial.println(sensorValue);
if(sensorValue < lowThreshold){
digitalWrite(lightPin, HIGH);
}
if (sensorValue > highThreshold)
digitalWrite(lightPin, LOW);
}
I changed the calabration so would respond to my readings
here is little compiled video of experiments
