100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
// Humidity Monitor
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// Copyright (C) 2017 Dave Astels
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// Released until the MIT license
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//
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// The trinket is controlled by an external Power Timer Breakout
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// (https://www.adafruit.com/product/3435)
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// 1. Every however often, the timer will power up the trinket which will run
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// this file.
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// 2. Relative humidity is checked
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// - if it's within range, the trinket tells the timer to shut it down and start
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// the timing cycle
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// - if it's out of range, it beeps & flashes the neopixel for 2 seconds, then
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// sleeps for 10 seconds, then goes to 2
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#include "Adafruit_Si7021.h"
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#include <Adafruit_DotStar.h>
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#include <SPI.h>
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const unsigned long falling_tones[] = { 2000, 1980, 1960, 1940, 1920, 1900, 1880, 1860, 1840, 1820, 1800, 1780, 1760, 1740, 1720, 1700, 1680, 1660, 1640, 1620 };
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const unsigned long rising_tones[] = { 2000, 2020, 2040, 2060, 2080, 3000, 3020, 3040, 3060, 3080, 4000, 4020, 4040, 4060, 4080, 5000, 5020, 5040, 5060, 5080 };
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const int dotstar_data_pin = 7;
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const int dotstar_clock_pin = 8;
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const int sound_pin = 3;
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const int sleep_pin = 4;
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const int target_humidity = 61.0;
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const unsigned long alert_interval = 20000;
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const unsigned long alert_duration = 500;
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const unsigned long comparison_delay = alert_interval - alert_duration;
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const unsigned long number_of_freq_steps = 20;
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const unsigned long alert_freq_step_time = alert_duration / number_of_freq_steps;
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Adafruit_Si7021 sensor = Adafruit_Si7021();
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//Adafruit_DotStar strip = Adafruit_DotStar(1, DOTSTAR_BRG);
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//--------------------------------------------------------------------------------
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// Sound the alert.
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void chirp(boolean direction)
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{
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const unsigned long *freqs = direction ? rising_tones : falling_tones;
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for (int i = 0; i < number_of_freq_steps; i++) {
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tone(sound_pin, freqs[i]);
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delay(alert_freq_step_time);
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}
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noTone(sound_pin);
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}
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//--------------------------------------------------------------------------------
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// Measure relative humidity and return whether it is under/in/over range.
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int check_rh()
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{
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float relative_humidity = sensor.readHumidity();
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if (relative_humidity < (target_humidity - 5)) {
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return -1;
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} else if (relative_humidity > (target_humidity + 5)) {
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return 1;
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} else {
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return 0;
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}
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}
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//--------------------------------------------------------------------------------
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// Repeatedly check the humidity and light the neopixel and sound the buzzer as
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// appropriate, for as long as the reading is out of range.
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// Initial comparison result is passed in.
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void warn_if_out_of_range(int comparison)
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{
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while (comparison != 0) {
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chirp(comparison > 0);
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delay(comparison_delay);
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comparison = check_rh();
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}
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}
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void setup()
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{
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pinMode(sleep_pin, OUTPUT);
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digitalWrite(sleep_pin, LOW);
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// strip.setPixelColor(0, 0);
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// strip.show();
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sensor.begin();
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warn_if_out_of_range(check_rh());
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}
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void loop()
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{
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digitalWrite(sleep_pin, HIGH);
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delay(50);
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digitalWrite(sleep_pin, LOW);
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delay(50);
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}
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