For “Mood Jar with FSR” I took the frosted cup I was working on last lab and added two FSRs. I positioned one of the FSRs to be a “picking up mug” pressure sensor, and prepared it to sit, for example, beneath a cardboard hot sleeve. The other FSR I added to the surface of the mug, for reasons. I then programmed the former to react to specific sensitivities, and the latter to be a mere “on/off” switch. The video will show what I mean.
I had a considerable amount of trouble getting processing to run using the serial outputs from the arduino environment, and will need to consult with someone who has experience with the program to debug what I’m sure is a profoundly simple problem…
The final image is of the results of my processing experiments.
Materials:
1 Jar
1 Arduino Micro
Wires
Solder/Soldering Iron
2 Potentiometers
3 Resistors (220 Ohms)
3 LEDs
Hot glue gun/hot glue
Frosted Glass spray paint
2 FSRs
2 Resistors (10k Ohms)
Video:
Arduino code:
int fsrOne = A0;
int fsrTwo = A1;
int potPinColor = A4; // Potentiometer output connected to analog pin 3
int potPinBlink = A5; // Second potentiometer controlling blink speed
int potValColor = 0; // Variable to store the input from the potentiometer
int potValBlink = 0; // Variable to store the input from the second potentiometer (controlling blink)
int photoCellValOne = 0;
int photoCellValTwo = 0;
// OUTPUT: Use digital pins 9-11, the Pulse-width Modulation (PWM) pins
// LED’s cathodes should be connected to digital GND
int redPin = 9; // Red LED, connected to digital pin 9
int grnPin = 10; // Green LED, connected to digital pin 10
int bluPin = 11; // Blue LED, connected to digital pin 11
// Program variables
int redVal = 0; // Variables to store the values to send to the pins
int grnVal = 0;
int bluVal = 0;
void setup()
{
pinMode(redPin, OUTPUT); // sets the pins as output
pinMode(grnPin, OUTPUT);
pinMode(bluPin, OUTPUT);
Serial.begin(9600);
}
// Main program
void loop()
{
potValColor = analogRead(potPinColor); // read the potentiometer value at the input pin
potValBlink = analogRead(potPinBlink);
photoCellValOne = analogRead(fsrOne);
photoCellValTwo = analogRead(fsrTwo);
if (photoCellValOne > 50)
{
analogWrite(redPin, photoCellValOne/4); // Write values to LED pins
analogWrite(grnPin, photoCellValOne/4);
analogWrite(bluPin, photoCellValOne/4);
}
else if (photoCellValTwo > 200)
{
analogWrite(redPin, 0);
analogWrite(grnPin, 0);
analogWrite(bluPin, 0);
}
else {
if (potValColor < 341) // Lowest third of the potentiometer’s range (0-340)
{
potValColor = (potValColor * 3) / 4; // Normalize to 0-255
redVal = 256 – potValColor;
grnVal = potValColor; // Green from off to full
bluVal = 1; // Blue off
}
else if (potValColor < 682) // Middle third of potentiometer’s range (341-681)
{
potValColor = ( (potValColor-341) * 3) / 4; // Normalize to 0-255
redVal = 1;
grnVal = 256 – potValColor;
bluVal = potValColor; // Blue from off to full
}
else // Upper third of potentiometer”s range (682-1023)
{
potValColor = ( (potValColor-683) * 3) / 4; // Normalize to 0-255
redVal = potValColor; // Red from off to full
grnVal = 1; // Green off
bluVal = 256 – potValColor;
};
analogWrite(redPin, redVal); // Write values to LED pins
analogWrite(grnPin, grnVal);
analogWrite(bluPin, bluVal);
delay(potValBlink);
analogWrite(redPin, redVal*0); // Write values to LED pins
analogWrite(grnPin, grnVal*0);
analogWrite(bluPin, bluVal*0);
delay(potValBlink);
};
Serial.println(photoCellValOne);
}
Processing Code:
/* PROCESSING SKETCH
* Arduino Ball Paint
* (Arduino Ball, modified 2008)
* ———————-
*
* Draw a ball on the screen whose size is
* determined by serial input from Arduino.
*
* Created 21 September 2016
* Noura Howell
*/
import processing.serial.*;
// Change this to the portname your Arduino board
String portname = “COM11″; //”/dev/cu.usbmodem1421”; // or “COM5″
Serial port;
String buf=””;
int cr = 13; // ASCII return == 13
int lf = 10; // ASCII linefeed == 10
int serialVal = 0;
void setup() {
size(300,300);
frameRate(10);
smooth();
background(40,40,40);
noStroke();
port = new Serial(this, portname, 9600);
}
void draw() {
// erase the screen
background(40, 40, 40);
// draw the ball
fill(255, 255, 255);
ellipse(150,150,serialVal,serialVal);
}
// called whenever serial data arrives
void serialEvent(Serial p) {
int c = port.read();
if (c != lf && c != cr) { //syntax error:expecting RPAREN, found ‘;’
buf += char(c);
}
if (c == lf) {
serialVal = int(buf);
println(“val=”+serialVal);
buf = “”;
}
}