/
cloud-lightning.ino
173 lines (150 loc) · 5.48 KB
/
cloud-lightning.ino
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/*
* Copyright (c) 2015 Molly Nicholas
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted
* (subject to the limitations in the disclaimer below) provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Molly Nicholas nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific prior written permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. THIS
* SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Adafruit_NeoPixel.h>
// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_RGB Pixels are wired for RGB bitstream
// NEO_GRB Pixels are wired for GRB bitstream
// NEO_KHZ400 400 KHz bitstream (e.g. FLORA pixels)
// NEO_KHZ800 800 KHz bitstream (e.g. High Density LED strip)
int NUM_LEDS = 4;
int LED_PIN = 4;
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);
const int HIGH_STRIKE_LIKELIHOOD = 5;
const int LOW_STRIKE_LIKELIHOOD = 10;
int currentDataPoint = 0;
int chance = LOW_STRIKE_LIKELIHOOD;
// Simple moving average plot
int NUM_Y_VALUES = 17;
float yValues[] = {
0,
7,
10,
9,
7.1,
7.5,
7.4,
12,
15,
10,
0,
3,
3.5,
4,
1,
7,
1
};
float simple_moving_average_previous = 0;
float random_moving_average_previous = 0;
float (*functionPtrs[10])(); //the array of function pointers
int NUM_FUNCTIONS = 2;
void setup() {
// Setup the Serial connection to talk over Bluetooth
Serial.begin(9600);
// Neopixel setup
strip.begin();
strip.show(); // Initialize all pixels to 'off'
// initializes the array of function pointers.
functionPtrs[0] = simple_moving_average;
functionPtrs[1] = random_moving_average;
}
void loop() {
String trigger = readFromBluetooth();
if (trigger==String("f")) {
int led = random(NUM_LEDS);
for (int i = 0; i < 10; i++) {
// Use this line to keep the lightning focused in one LED.
// lightningStrike(led):
// Use this line if you want the lightning to spread out among multiple LEDs.
lightningStrike(random(NUM_LEDS));
}
// Once there's been one strike, I make it more likely that there will be a second.
chance = HIGH_STRIKE_LIKELIHOOD;
} else {
chance = LOW_STRIKE_LIKELIHOOD;
}
turnAllPixelsOff();
delay(1000);
}
void turnAllPixelsOff() {
for (int i = 0; i < NUM_LEDS; i++) {
strip.setPixelColor(i, 0);
}
strip.show();
}
void lightningStrike(int pixel) {
float brightness = callFunction(random(NUM_FUNCTIONS));
float scaledWhite = abs(brightness*500);
strip.setPixelColor(pixel, strip.Color(scaledWhite, scaledWhite, scaledWhite));
strip.show();
delay(random(5, 100));
currentDataPoint++;
currentDataPoint = currentDataPoint%NUM_Y_VALUES;
}
/**
* Read the data from the BLE, breaking on '\n' and '\r' characters.
*/
String readFromBluetooth() {
String readString = "";
while (Serial.available()) {
delay(10); //small delay to allow input buffer to fill
char c = Serial.read(); //gets one byte from serial buffer
if (c == '\n' || c == '\r') {
break;
}
readString += c;
}
return readString;
}
float callFunction(int index) {
return (*functionPtrs[index])(); //calls the function at the index of `index` in the array
}
// https://en.wikipedia.org/wiki/Moving_average#Simple_moving_average
float simple_moving_average() {
uint32_t startingValue = currentDataPoint;
uint32_t endingValue = (currentDataPoint+1)%NUM_Y_VALUES;
float simple_moving_average_current = simple_moving_average_previous +
(yValues[startingValue])/NUM_Y_VALUES -
(yValues[endingValue])/NUM_Y_VALUES;
simple_moving_average_previous = simple_moving_average_current;
return simple_moving_average_current;
}
// Same as simple moving average, but with randomly-generated data points.
float random_moving_average() {
float firstValue = random(1, 10);
float secondValue = random(1, 10);
float random_moving_average_current = random_moving_average_previous +
firstValue/NUM_Y_VALUES -
secondValue/NUM_Y_VALUES;
random_moving_average_previous = random_moving_average_current;
return random_moving_average_current;
}