Bus Stop Mister

The bus stop mister helps people to stay cool during the hot summer days.

BeginnerWork in progress213

Things used in this project

Hardware components

Arduino Nano R3

Solderless Breadboard Half Size

DC Motor, 12 V

DFRobot Gravity:Digital Push Button (Yellow)

Texas Instruments Dual H-Bridge motor drivers L293D

Resistor 1k ohm

5 mm LED: Green

Capacitor 10 µF

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

With extreme heat on the rise, people especially the elderly and homeless are more susceptible to being affected by the sun and heat. Keeping this in mind, we brainstormed and prototyped a bus stop mister. In city areas, there are bus stop shelters where many people pass by. So, we decided to develop a bus stop mister that collects rainwater and is powered by solar. Using gravity and filtration, the water disperses through a fan. This results in a cooling mist for people.

makeathon.ino

// Bus Stop Mister
// Control Code
// Authors: Nicholas Spaid, Jared Weber

// Pin numbers
const int motor_clockwise = 5;
const int motor_counterclockwise = 6;
const int button = 8;
const int green_led = 11;

// Timer nonsense
const int open_stop_time = 165;
const int shower_time = open_stop_time + 2500;
const int close_stop_time = shower_time + 155; 
unsigned long timer = 0;
unsigned long current_timer = 0;

// State machine
const int opening = 1;
const int idle = 0;
int state = idle;   

// Button states & debouncing
int current_button_state;           
int previous_button_state = LOW;
unsigned long time = 0;
unsigned long debounce = 200UL;

// Declare inputs and outputs
void setup() {
  pinMode(motor_clockwise, OUTPUT);
  pinMode(motor_counterclockwise, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  pinMode(green_led, OUTPUT);
  digitalWrite(green_led,HIGH);
  digitalWrite(motor_clockwise,LOW);
  digitalWrite(motor_counterclockwise,LOW);
}

void loop() {
  current_button_state = digitalRead(button);

  if (current_button_state == HIGH && previous_button_state == LOW && state == idle && millis() - time > debounce) {
    state = opening;
    time = millis();
  }
  previous_button_state = current_button_state;
  
  if (state == opening) {
    current_timer = millis() - timer;
    if (timer == -1) {
      timer = millis();
      digitalWrite(motor_counterclockwise,HIGH);
    } else if (current_timer >= open_stop_time && current_timer < shower_time) {
      digitalWrite(motor_counterclockwise,LOW);
    } else if (current_timer >= shower_time && current_timer < close_stop_time) {
      digitalWrite(motor_clockwise,HIGH);
    } else if (current_timer >= close_stop_time) {
      digitalWrite(motor_clockwise,LOW);
      timer = -1;
      state = idle;
    }
  } else {
    timer = -1;
  }
  digitalWrite(green_led, !state);
}