PART 1: Variable Input & Output:
I began this section by building the circuit with a potentiometer and two yellow LEDs. After creating a schematic, I built the circuit and programed the Arduino so that the different LEDs would light up depending on the reading from the potentiometer.
Below is a picture of the schematic I used to build the circuit.
Below is a picture of the potentiometer and LEDs used in the circuit.
Below is the code I entered into Arduino to get the potentiometer to turn each LED on depending on the analog input received.
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| int pot = A0; | |
| int LED1 = 2; | |
| int LED2 = 3; | |
| int mappedVal; | |
| void setup() | |
| { | |
| Serial.begin(9600); | |
| pinMode(LED1, OUTPUT); | |
| pinMode(LED2, OUTPUT); | |
| } | |
| void loop() | |
| { | |
| int potVal = analogRead(pot); | |
| mappedVal = map(potVal, 0, 1023, 0, 3); | |
| if (mappedVal <= 1) | |
| { | |
| digitalWrite(LED1, HIGH); | |
| digitalWrite(LED2, LOW); | |
| } | |
| else if (mappedVal > 1) | |
| { | |
| digitalWrite(LED1, LOW); | |
| digitalWrite(LED2, HIGH); | |
| } | |
| } |
Below is a video of the potentiometer in action, lighting one LED or the other based on the analog values it received from me turning the switch.
PART 2: Tone Output:
In this section, I began by drawing a schematic. Then I soldered wires to the speaker and I created the circuit. I programed Arduino so that when I covered one photocell, the tone played by the speaker would be at one frequency and when I covered the other photocell, the tone was played at a different frequency.
Below is a schematic I used to build the circuit.
Below is the speaker circuit connected the Arduino.
Below is the code I entered into Arduino to get the speaker to play different frequencies depending on the analog input received from the photocells.
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| int photoCell = A0; | |
| int sensorReading; | |
| float freqVal; | |
| int speaker = 2; | |
| void setup() | |
| { | |
| Serial.begin(9600); | |
| pinMode(speaker, OUTPUT); | |
| } | |
| void loop() | |
| { | |
| int photoVal = analogRead(photoCell); | |
| sensorReading = photoVal; | |
| Serial.print("Sensor Reading: "); | |
| Serial.println(sensorReading); | |
| delay(500); | |
| freqVal = map(sensorReading, 0, 1023, 100, 1000); | |
| if (sensorReading <= 512) | |
| { | |
| tone(speaker, freqVal); | |
| } | |
| else | |
| { | |
| tone(speaker, freqVal); | |
| } | |
| } |
Below is the speaker in action, changing tones bases on the analog input received from the photocells.
PART 3: Laser Cut Sensor Box:
I began this part of the lab by creating a box in MakerCase. I then brought it over to Illustrator and made sure it fit all the laser requirements. I also added in some text to show that the enclosure was created for Lab 3. It was created for the photocell/speaker circuit. The circuit goes inside and if the lid is removed, the tone changes.
Object 