Software:
1.Arduino IDE
2.LCD Keypad library Download link: Click Here..!!
3.LiquidCrystal library Download link: Click Here..!!
Hardware:
1. Nebulizer
2. Arduino Uno
3. MPX5500 Pressure Sensor more details Click Here
4. Arduino LCD Shield
5. 5V Buzzer
6. 12V DC Relay
Arduino Code:
#include <LiquidCrystal.h>
#include "LCDKeypad.h"
#define HOURS 1
#define MINUTES 2
#define SECONDS 3
#define beeper 12
// The LCD screen
LCDKeypad lcd;
unsigned int hours = 0;
unsigned int minutes = 0;
unsigned int seconds = 0;
unsigned int setting = 0;
unsigned int set = 0;
const int analogInPin = A1;
int sensorValue = 0;
int Voltage;
volatile byte pulseCount;
byte relay = 3;
void setup() {
// Set up the LCD's number of columns and rows:
lcd.begin(16,2);
lcd.setCursor(0, 1);
lcd.print("hours =");
pulseCount = 0;
pinMode(relay, OUTPUT);
digitalWrite(relay, LOW);
pinMode(beeper, OUTPUT);
}
void loop() {
if(set == 1) {
if((hours >= 0) && (minutes >= 0) && (seconds >= 0))
{
digitalWrite(relay, HIGH);
}
if((hours == 0) && (minutes == 0) && (seconds == 0))
{
digitalWrite(relay, LOW);
tone(beeper,300,600);
delay(100);
}
stepDown();
}
sensorValue = analogRead(analogInPin);
float sensorVoltage = sensorValue * (5.0 / 1023.0);
Voltage=sensorVoltage/0.009;
sensorVoltage=(Voltage)-(0.2);
sensorVoltage = sensorVoltage * (0.145037738);
if(sensorVoltage < 3.5)
{
sensorVoltage=0;
}
lcd.setCursor(0,0);
lcd.print("Press =");
lcd.setCursor(7,0);
lcd.print(sensorVoltage);
lcd.setCursor(13,0);
lcd.print("PSI");
// Print the time on the LCD
printTime();
// Listen for buttons for 1 second
buttonListen();
}
//--------------------------------------------------------------// TIMER METHODS------------------------------------------
//-----------------//BUTTONS-----------------------
void buttonListen() {
// Read the buttons five times in a second
for (int i = 0; i < 5; i++) {
// Read the buttons value
int button = lcd.button();
switch (button) {
// Right button was pushed
case KEYPAD_RIGHT:
digitalWrite( beeper , HIGH);
delay(100); // wait for a second
digitalWrite( beeper , LOW);
delay(100); // wait for a second
setting++;
break;
// Left button was pushed
case KEYPAD_LEFT:
digitalWrite( beeper , HIGH);
delay(100); // wait for a second
digitalWrite( beeper , LOW);
delay(100); // wait for a second
setting--;
break;
// Up button was pushed
case KEYPAD_UP:
{
digitalWrite( beeper , HIGH);
delay(100); // wait for a second
digitalWrite( beeper , LOW);
delay(100); // wait for a second
set = 0;
switch (setting) {
case HOURS:
hours++;
break;
case MINUTES:
minutes++;
break;
case SECONDS:
seconds++;
}
}
break;
// Down button was pushed
case KEYPAD_DOWN:{
digitalWrite( beeper , HIGH);
delay(100); // wait for a second
digitalWrite( beeper , LOW);
delay(100);
set = 0;
switch (setting) {
case HOURS:
hours--;
if (hours == -1) hours = 23;
break;
case MINUTES:
minutes--;
if (minutes == -1) minutes = 59;
break;
case SECONDS:
seconds--;
if (seconds == -1) seconds = 59;
}
}
break;
case KEYPAD_SELECT:
{
digitalWrite( beeper , HIGH);
delay(100); // wait for a second
digitalWrite( beeper , LOW);
delay(100); // wait for a second
set = 1;
}
}
setting %= 4;
printSetting();
hours%=24;
minutes %= 60;
seconds %= 60;
printTime();
// Wait one fifth of a second to complete
while(millis() % 200 != 0);
}
}
// Print the current setting
void printSetting() {
lcd.setCursor(0,1);
switch (setting) {
case HOURS:
lcd.print("Hours ");
break;
case MINUTES:
lcd.print("Minutes");
break;
case SECONDS:
lcd.print("Seconds");
}
}
//-----------------//STEP DOWN-----------------------
//if (seconds > 0)
void stepDown()
{
if (seconds > 0)
{
seconds -= 1;
}
else if (minutes > 0)
{
seconds = 59;
minutes -= 1;
}
else if (hours > 0)
{
minutes = 59;
hours -= 1;
}
}
// Print the time on the LCD
void printTime() {
// Set the cursor at the begining of the second row
lcd.setCursor(8,1);
char time[17];
sprintf(time, "%02i:%02i:%02i", hours, minutes, seconds);
lcd.print(time);
}
void pulseCounter()
{
pulseCount++;
}
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