Keep Your Plant Under Control

1#include <FastLED.h>
2
3#define LED_PIN     6
4#define NUM_LEDS    15
5#define BRIGHTNESS  30
6#define LED_TYPE    WS2812
7#define COLOR_ORDER  GRB
8CRGB leds[NUM_LEDS];
9
10#define UPDATES_PER_SECOND 100
11
12int analogPin  = A0;
13int moisture;
14int percentage;
15//map the max a min values
16int map_low  = 1023;
17int map_high = 350;
18
19void setup() {
20  Serial.begin(9600);
21  delay( 3000 ); // power-up safety delay
22  FastLED.addLeds<LED_TYPE, LED_PIN,  COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
23  FastLED.setBrightness(  BRIGHTNESS );
24  //reset the led strip color
25  for (int i = 0; i < NUM_LEDS;  i++) {
26    leds[i] =  CRGB::Black;
27    FastLED.show();
28  }
29}
30
31void  setColor(int perc) {
32  //evaluate the number of leds to turn on (at least 1 for  0%)
33  int num = ((NUM_LEDS * perc) / 100) + 1;
34  //turn off the leds that  are not needed, so the right percentage
35  //of the leds will be on
36  for (int  i = NUM_LEDS; i > num - 1; i--) {
37    leds[i] =  CRGB::Black;
38    FastLED.show();
39  }
40  //here's the green 
41  if (perc >= 51) {
42    for (int i = 0; i < num;  i++) {
43      leds[i] =  CRGB::Green;
44      FastLED.show();
45    }
46  }  else if (perc >= 21 && perc <= 50) {//the yellow
47    for (int i = 0; i < num;  i++) {
48      leds[i] =  CRGB::Yellow;
49      FastLED.show();
50    }
51  }  else if (perc <= 20) {
52    for (int i = 0; i < num; i++) {//the red
53      leds[i]  =  CRGB::Red;
54      FastLED.show();
55    }
56  }
57
58}
59
60void loop()  {
61  //we read raw value to evaluate the percentage
62  moisture = analogRead(analogPin);
63  Serial.print("Raw: ");
64  Serial.print(moisture);
65
66  percentage = map(moisture,  map_low, map_high, 0, 100);
67
68  Serial.print(" | Percentage: ");
69  Serial.print(percentage);
70
71  Serial.println("%");
72  //then we set the color based on the percentage
73  setColor(percentage);
74  delay(1000);
75}
76