Mr. Hydrate

Description

Your body depends on water to survive. Every cell, tissue, and organ in your body needs water to work properly. For example, your body uses water to maintain its temperature, remove waste, and lubricate your joints. Water is needed for overall health and wellness. This is especially so in hotter countries such as Singapore where I am stationed. Singapore is a small island nation located near the equatorial where the average temperature is around 30 degrees celsius. To beat the heat, we should drink more water to stay hydrated so as to avoid heat-related illness or injury. Whenever we see someone drinking water, why do we feel the urge to do the same, even if we are not thirsty? Mr.Hydrate is an example of a possible animated character to encourage us to drink water on a hot day with his eye-catching motion and warning light when the surrounding temperature rises above 30 degrees celsius.

Details

Demo Video:

Code Snippets:

//Libraries
#include <DHT.h>
#include <Servo.h>
//Constants
#define DHTPIN 2     // pin we're connected to
#define DHTTYPE DHT22   // DHT22
//Variables
float temp; //Stores temperature value
const int transistorPin = 9;    // connected to the base of the transistor
int pos = 0;    // variable to store the servo position
DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor
Servo myservo;  // create servo object to control a servo
void setup() {
// set  the transistor pin as output:
pinMode(transistorPin, OUTPUT);
//Initialize serial port
Serial.begin(9600);
//Serial.println("DHT22 sensor testing");
//Initialize the DHT sensor
dht.begin();
myservo.attach(10);  // attaches the servo on pin 10 to the servo object
}
void loop() {
//Read data and store it to variable temp
temp = dht.readTemperature();
Serial.print("Celsius = ");
Serial.print(temp);
Serial.println(" degree celsius");
if (temp > 30.0) {
digitalWrite(transistorPin, HIGH);
delay(500);
digitalWrite(transistorPin, LOW);
delay(500);
for (pos = 0; pos <= 90; pos += 10) { // goes from 0 degrees to 90 degrees
// in steps of 1 degree
myservo.write(pos);              // tell servo to go to position in variable 'pos'
delay(15);                       // waits 15ms for the servo to reach the position
}
for (pos = 90; pos >= 0; pos -= 10) { // goes from 90 degrees to 0 degrees
myservo.write(pos);              // tell servo to go to position in variable 'pos'
delay(15);                       // waits 15ms for the servo to reach the position
}
}
else {
digitalWrite(transistorPin, LOW);
}
}

EA_CA2

Build instructions

Step 1

• Temperature sensor (DHT22)
• Servo motor (SG 90)
• Arduino Uno
• CP 2102 Module
• Transistor 2N 2222
• 1k ohm resistor
• 180 ohm resistor
• LED
• Wires
• Female holders
• Pins
• Stripboard

Step 2

Step 3

Step 4

Use a heat source that is above 30 degrees celsius to test if there is an output at servo and LED.

Step 5

Step 6

Step 7

Files

EA_CA2.ino