Arduino Uno Quick Start Manual page 123

MotionSensor/Buffering/Buffering.ino
const unsigned int
Line 1
const unsigned int
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const unsigned int
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const unsigned int
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const unsigned int
5
X_AXIS_PIN, Y_AXIS_PIN, Z_AXIS_PIN
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};
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const unsigned int
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const unsigned int
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int buffer[NUM_AXES][BUFFER_SIZE];
10
int buffer_pos[NUM_AXES] = { 0 };
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void setup() {
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Serial.begin(BAUD_RATE);
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}
15
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int get_axis(const int
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delay(1);
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buffer[axis][buffer_pos[axis]] = analogRead(PINS[axis]);
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buffer_pos[axis] = (buffer_pos[axis] + 1) % BUFFER_SIZE;
20
long sum = 0;
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for (unsigned int
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sum += buffer[axis][i];
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return round(sum / BUFFER_SIZE);
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}
25
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int get_x() { return
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int get_y() { return
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int get_z() { return
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void loop() {
30
Serial.print(get_x());
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Serial.print("
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Serial.print(get_y());
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Serial.print("
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Serial.println(get_z());
35
}
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As usual, we define some constants for the pins we use first. This time, we
also define a constant named
are measuring. We also have an array named
pins we use. This will help us keep our code more generic later.
In line 10, we declare buffers for all axes. They will be filled with the sensor
data we measure, so we can calculate average values when we need them.
We have to store our current position in each buffer, so in line 11, we define
an array of buffer positions.
setup only initializes the serial port; the real action takes place in
X_AXIS_PIN = 2;
Y_AXIS_PIN = 1;
Z_AXIS_PIN = 0;
NUM_AXES = 3;
PINS[NUM_AXES] = {
BUFFER_SIZE = 16;
BAUD_RATE = 9600;
axis) {
i = 0; i < BUFFER_SIZE; i++)
get_axis(0); }
get_axis(1); }
get_axis(2); }
");
");
NUM_AXES
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Finding and Polishing Edge Values
that contains the number of axes we
PINS that contains a list of the
105
get_axis .
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