Lab assignment 06: Use a Piezo as a Theremin Use a photoresistor to calibrate a Piezo that changes the frequency.
The calibration process takes place with while loop (millis() < 5000). The key point in calibration is the high and low points are initially reversed. sensorValue <1023 (LOW)
sensorValue > 0 (HIGH) Key terms: while (millis() < 5000) {
sensorValue = analogRead(A0);
// remap sensr 0-1023 to freq 50,4000
int pitch = map (sensorValue,sensorLow,sensorHigh,500,4000);
tone(8,freq[i],30);
PROJECT_06_THEREMIN
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Lab assignment 07: Use a Piezo as a Keyboard Using a resistor ladder. Take reading from 5 resistors in series the voltage drops across each resistor giving a different output. The values are converted to frequencies for the piezo.
Key terms: int notes[] = {262,294,330,349};
int keyVal = analogRead(A0); (0-1023)
tone(8,notes[1]);
(keyVal >= 990 && keyVal <=1010)
PROJECT_07_PIZEOTONES
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Lab assignment 08: Digital Hourglass +tilt switch Using a millis() function to read the time in milliseconds count the interval time and then set on a LED for that time period. Then use the tilt switch to reset all the LED’s.
Key terms: unsigned long previousTime = 0;
long interval = 1000;
//read switchpin 8
switchState = digitalRead(switchPin);(either 1 or 0)
prevSwitchState=switchState;
PROJECT_08_TILTSWITCH
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Lab assignment 09: Motor switch using a transistor gate and switch Press a button to send a signal to arduino that resends a high to the transistor gate. That activates the motor. Use a diode in parallel with the motor to counteract reverse induced voltage.
Key terms: pinMode(motorPin, OUTPUT);
switchState = digitalRead(switchPin);
if (switchState == HIGH) {
digitalWrite(motorPin,HIGH);
} else {
digitalWrite(motorPin,LOW);
}
PROJECT_09_MOTORWITHBUTTON_1
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