COFFEE ALARM
870 5
Goudu Varaprasad

COFFEE ALARM

Motivation: I have come up with the idea of a Coffee Alarm as a solution to my own real-life...

Description:-

Motivation: I have come up with the idea of a Coffee Alarm as a solution to my own real-life problem. Like any other youngster, I normally have a lot of tasks to complete every day. Before going to bed every night, I set my alarm at 6 A.M., and when the alarm starts ringing, I snooze it repeatedly and wake up at around 9 A.M. I tried different alarm apps which demands to complete certain tasks to switch off the alarm. But nothing worked and at the end of the day, some of my tasks are left incomplete. I eventually found out this problem is a common problem for most of the people. Then I found drinking coffee is the best way to get out of the bed. It is impossible to get to sleep after drinking coffee as the caffeine present in the coffee will not let us sleep. So, I have designed and fabricated a machine that will wake me up every day with a hot and fresh coffee. Future Scope: Currently the machine is not compatible with food-grade standards. I will modify the machine to make it food-grade using stainless steel and also include a wifi chip into the circuit so that it can be controlled using Alexa and Google Home as well. Finally, I wish to convert this idea into a market-ready product and help people who are facing the same issue as mine.

Project Used Hardware

Coffee Alarm Hardware

Atmega328p microcontroller, HM-10 bluetooth module, DS1302 RTC Module, 5V relay module, 28BYJ-48 Stepper Motor, 0.96" OLED display, 10W speaker,5V DC BO Motor, 24V Solenoid Valve, 12V DC Adapter, 250W water heater

Project Used Software

Coffee Alarm Hardware

Arduino IDE, EasyEDA, Audacity, Encode Audio, MIT App Inventor2, Tinkercad, Ultimaker Cura

Project Hardware Software Selection

Coffee Alarm Hardware

Atmega328p is easy to program using Arduino, an open-source IDE, which reduces the development time a lot. I chose HM-10 over HC-05 to make it compatible with both Android and iOS. The Stepper motor is used in the powder dispenser mechanism so that the user can control the amount of coffee premix to dispense according to their choice. (Not yet implemented this feature). Solenoid Valves are the best when it comes to dispensing water in a controlled manner and also do not cause any leakages. Additionally, an LED strip is included to some lighting to the machine. 10W speaker gives us enough loudness to wake you up from sleep. I could find only the 250W mini water heater which can be used easily in a prototype since it is so small in size and also very cheap. EasyEDA is my preferred designing tool as I can design both schematic and PCB and it also has a lot of 3D components available. Android App is designed in MIT app inventor2 which is a block-based online platform. A high level of coding is not required to design android apps. TinkerCad is used to design the screw mechanism to dispense the coffee premix and base plate to hold the mixer jar. Ultimaker Cura is used to slice the 3D Model for 3D printing.

Circuit Diagram

Coffee Alarm Circuit Diagram

Coffee Alarm Circuit Diagram

 

Most of the components used in this prototype are in the form of a plug and play modules since I wish to modify this machine further to include more features and make it food-grade.

Code

#include <SPI.h>                  
#include <Wire.h>                 //For OLED Display communication with atmega3328p
#include <Adafruit_GFX.h>         //For OLED Display
#include <Adafruit_SSD1306.h>     //For OLED Display
#include <ThreeWire.h>            //For RTC Module communicationi with atmega328p
#include <RtcDS1302.h>            //For RTC Module
#include <PCM.h>                  //For playing music using arduino
#include <EEPROM.h>               //Required for storing Alarm settings when power is off

//Pins for Stepper Motor
#define STEPPER_PIN_1 9   
#define STEPPER_PIN_2 6
#define STEPPER_PIN_3 7
#define STEPPER_PIN_4 8
#define OLED_RESET 4

// OLED Display Initialization
Adafruit_SSD1306 display(OLED_RESET);
ThreeWire myWire(4,5,2); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);            
char current_time[80];
int step_number = 0;
unsigned long start_time;

//Timing for different dispensing mechanisms
int powder_dispense_time = 25000;     
int water_dispense_time = 20000;
int mixer_time = 5000;
String inData = "";
int index; 
bool Alarm_Set;
int hours, minutes;

//Wakeup Music file
const unsigned char sample[] PROGMEM = {
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210, 194, 124, 74, 100, 155, 213, 219, 192, 187, 169, 142, 110, 90, 79, 96, 78, 46, 0, 0, 43, 188, 255, 243, 102, 8, 25, 97, 164, 184, 194, 203, 194, 164, 99, 72, 106, 173, 227, 220, 197, 182, 160, 134, 99, 82, 84, 93, 86, 45, 0, 0, 40, 185, 255, 255, 118, 18, 15, 85, 174, 190, 203, 197, 178, 155, 108, 73, 109, 162, 228, 244, 198, 174, 119, 113, 113, 107, 126, 111, 79, 49, 0, 0, 0, 148, 255, 255, 171, 50, 17, 56, 144, 175, 194, 186, 181, 183, 119, 77, 88, 154, 222, 235, 200, 168, 144, 127, 119, 100, 117, 122, 101, 52, 27, 0, 0, 94, 193, 255, 233, 89, 37, 49, 113, 167, 164, 160, 180, 196, 173, 97, 80, 145, 201, 236, 212, 162, 139, 133, 126, 109, 115, 124, 99, 68, 34, 10, 0, 0, 113, 229, 255, 206, 81, 30, 60, 120, 177, 184, 180, 179, 155, 131, 91, 123, 186, 216, 236, 202, 135, 93, 106, 138, 154, 154, 127, 81, 46, 9, 1, 0, 0, 140, 244, 255, 209, 54, 20, 58, 131, 182, 166, 170, 182, 185, 155, 107, 109, 159, 213, 211, 184, 146, 124, 138, 141, 133, 126, 130, 105, 73, 25, 14, 0, 0, 85, 192, 255, 249, 126, 28, 16, 76, 178, 203, 199, 194, 160, 152, 111, 114, 158, 186, 203, 177, 145, 150, 143, 130, 127, 143, 149, 128, 74, 29, 7, 11, 0, 1, 133, 238, 255, 222, 70, 0, 22, 127, 194, 202, 191, 184, 191, 175, 131, 104, 144, 175, 188, 175, 136, 127, 124, 137, 145, 152, 147, 129, 70, 38, 21, 31, 6, 0, 73, 214, 255, 255, 104, 2, 16, 113, 205, 201, 170, 160, 168, 181, 141, 114, 127, 158, 191, 165, 130, 123, 147, 172, 147, 130, 118, 121, 111, 67, 67, 79, 56, 0, 0, 59, 231, 255, 255, 88, 0, 2, 121, 215, 202, 182, 164, 147, 149, 120, 106, 145, 160, 192, 186, 143, 137, 130, 125, 127, 121, 137, 150, 148, 101, 53, 39, 27, 4, 0, 39, 196, 255, 255, 154, 0, 0, 64, 196, 241, 194, 171, 149, 168, 144, 89, 87, 138, 197, 211, 157, 92, 104, 134, 163, 158, 122, 129, 140, 130, 75, 53, 56, 50, 34, 0, 39, 180, 255, 255, 161, 32, 0, 79, 179, 201, 187, 170, 181, 176, 119, 75, 78, 137, 195, 197, 154, 119, 119, 147, 157, 143, 130, 139, 144, 114, 87, 67, 85, 87, 57, 9, 0, 94, 215, 255, 222, 97, 32, 46, 94, 167, 198, 207, 208, 173, 119, 68, 74, 123, 170, 203, 184, 157, 149, 137, 141, 138, 129, 135, 140, 138, 120, 92, 98, 100, 95, 69, 32, 0, 13, 135, 228, 255, 187, 62, 16, 47, 123, 189, 196, 205, 195, 170, 134, 82, 77, 119, 181, 202, 182, 145, 130, 136, 151, 151, 142, 142, 145, 137, 109, 85, 73, 75, 98, 93, 62, 24, 0, 57, 164, 230, 229, 137, 65, 68, 112, 171, 171, 159, 168, 163, 173, 136, 109, 117, 136, 183, 183, 166, 156, 148, 158, 147, 125, 122, 129, 150, 142, 110, 85, 77, 83, 83, 71, 47, 12, 15, 109, 207, 254, 204, 86, 28, 40, 106, 183, 199, 197, 175, 149, 137, 115, 114, 127, 150, 170, 166, 160, 161, 155, 147, 142, 138, 143, 151, 137, 114, 91, 83, 106, 123, 114, 88, 52, 17, 0, 60, 169, 244, 241, 138, 53, 25, 58, 139, 192, 207, 190, 161, 148, 125, 113, 107, 125, 161, 186, 193, 177, 143, 130, 122, 124, 142, 151, 151, 132, 108, 85, 94, 107, 123, 122, 84, 31, 0, 0, 89, 203, 255, 226, 112, 34, 30, 93, 173, 203, 204, 174, 129, 125, 117, 140, 154, 157, 163, 155, 156, 153, 149, 148, 133, 131, 138, 144, 147, 130, 116, 103, 103, 95, 97, 93, 80, 46, 23, 10, 66, 162, 211, 230, 157, 76, 47, 68, 135, 189, 202, 200, 176, 160, 131, 103, 108, 122, 167, 188, 181, 164, 140, 125, 122, 133, 142, 146, 141, 132, 122, 121, 112, 94, 93, 84, 94, 89, 62, 39, 6, 60, 150, 214, 228, 145, 74, 53, 76, 146, 184, 190, 191, 171, 162, 141, 107, 100, 112, 152, 184, 199, 174, 133, 126, 130, 141, 134, 125, 133, 154, 165, 147, 100, 86, 85, 95, 109, 81, 62, 46, 22, 33, 105, 171, 222, 198, 108, 63, 57, 109, 179, 202, 197, 166, 142, 138, 132, 131, 122, 129, 156, 181, 180, 156, 128, 124, 142, 156, 156, 150, 143, 139, 126, 113, 95, 87, 92, 107, 111, 93, 58, 20, 6, 20, 97, 183, 237, 218, 138, 61, 46, 93, 164, 204, 211, 189, 156, 145, 122, 111, 117, 133, 157, 173, 162, 157, 152, 151, 159, 146, 124, 119, 127, 146, 150, 134, 108, 86, 86, 88, 105, 86, 58, 33, 25, 39, 79, 154, 198, 219, 176, 109, 86, 91, 133, 163, 166, 169, 164, 169, 166, 139, 129, 106, 111, 132, 143, 171, 169, 173, 160, 131, 118, 108, 118, 139, 149, 151, 136, 108, 96, 90, 97, 103, 91, 81, 64, 47, 31, 54, 127, 190, 231, 199, 134, 96, 86, 118, 153, 159, 159, 148, 145, 161, 153, 139, 113, 101, 128, 159, 179, 166, 139, 130, 135, 144, 135, 129, 132, 147, 164, 145, 115, 94, 85, 91, 105, 101, 83, 62, 45, 31, 35, 89, 155, 213, 220, 170, 119, 82, 101, 149, 167, 165, 139, 127, 149, 156, 155, 144, 128, 130, 141, 145, 151, 146, 145, 154, 153, 154, 146, 134, 135, 137, 130, 121, 103, 94, 94, 95, 103, 96, 78, 58, 39, 33, 51, 107, 171, 210, 216, 171, 120, 99, 106, 132, 150, 149, 137, 138, 153, 168, 165, 144, 118, 108, 117, 137, 153, 157, 158, 156, 153, 155, 151, 145, 136, 124, 122, 114, 108, 105, 104, 104, 100, 90, 70, 55, 43, 33, 
};

void Make_Coffee();
void Alarm_Status();
void OneStep();

void setup() {
  pinMode(12, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(13, OUTPUT);
  digitalWrite(13,HIGH);
  digitalWrite(12,LOW);
  digitalWrite(10,HIGH);
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  Rtc.Begin();
  pinMode(STEPPER_PIN_1, OUTPUT);
  pinMode(STEPPER_PIN_2, OUTPUT);
  pinMode(STEPPER_PIN_3, OUTPUT);
  pinMode(STEPPER_PIN_4, OUTPUT);

  //Reading Alarm setings when powered on.
  Alarm_Status();
  Alarm_Set = EEPROM.read(0);
  hours=EEPROM.read(1);
  minutes=EEPROM.read(2);
}

void loop() {

  //Checking for incoming data from bluetooth module
  while (Serial.available() > 0) {   // if HM10 sends something then read
    inData = Serial.readString();
  }
  if(inData!=""){
      int len=inData.length();
      for(int i=0;i<len-1;i++){
          if(inData[i]==':'){
              index = i;
              Serial.println("index is :"+String(i));
            }
        }
      hours = (inData.substring(0,index)).toInt();
      minutes = (inData.substring(index+1)).toInt();
      EEPROM.write(0,1);
      EEPROM.write(1,hours);
      EEPROM.write(2,minutes);
      Alarm_Set = 1;
      Alarm_Status();
      inData=""; 
    }

    //Updating time on OLED display in real time
  RtcDateTime now = Rtc.GetDateTime();
  display.setTextSize(2);
  display.setTextColor(WHITE, BLACK);
  display.setCursor(33,1);
  sprintf(current_time, "%02d:%02d", now.Hour(), now.Minute());
  display.println(current_time);
  display.display();

  if(Alarm_Set){
      if(hours == now.Hour() && minutes == now.Minute()){
        Make_Coffee(); 
      }
    }
  delay(700);
}

//Function to display alarm status on OLED display
void Alarm_Status(){
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE, BLACK);
  if(EEPROM.read(0)==0){
       display.setCursor(25,22);
       display.println("Alarm Not Set"); 
    }
  else{
       display.setCursor(10,22); 
       sprintf(current_time, "Alarm Set: %02d:%02d", EEPROM.read(1), EEPROM.read(2));
       display.println(current_time); 
    }
  display.display();
}

//Functin to make coffee
void Make_Coffee(){
  //Start Heating Water
  digitalWrite(10,LOW);
  //Powder Dispenser
  start_time = millis();
  while(millis()-start_time<powder_dispense_time){
      OneStep();
      delay(2);
    }
  digitalWrite(6,LOW);  
  digitalWrite(7,LOW);
  digitalWrite(8,LOW);
  digitalWrite(9,LOW);
  //StOP Heating Water
  delay(3000);
  digitalWrite(10,HIGH);
  delay(1000);
  //Hot Water Dispenser
  digitalWrite(13,LOW);
  delay(water_dispense_time);
  digitalWrite(13,HIGH);
  delay(1000);
  //Coffee Mixer 
  digitalWrite(12,HIGH);
  delay(mixer_time);
  digitalWrite(12,LOW);
  delay(2000);
  //Alarm Ringtone
  EEPROM.write(0,0);
  Alarm_Set=0;
  Alarm_Status();
  while(1){
       startPlayback(sample, sizeof(sample));  
       delay(3000);
    } 
}

//Stepper Motor Routine
void OneStep(){
  switch(step_number){
  case 0:
  digitalWrite(STEPPER_PIN_1, LOW);
  digitalWrite(STEPPER_PIN_2, LOW);
  digitalWrite(STEPPER_PIN_3, LOW);
  digitalWrite(STEPPER_PIN_4, HIGH);
  break;
  case 1:
  digitalWrite(STEPPER_PIN_1, LOW);
  digitalWrite(STEPPER_PIN_2, LOW);
  digitalWrite(STEPPER_PIN_3, HIGH);
  digitalWrite(STEPPER_PIN_4, LOW);
  break;
  case 2:
  digitalWrite(STEPPER_PIN_1, LOW);
  digitalWrite(STEPPER_PIN_2, HIGH);
  digitalWrite(STEPPER_PIN_3, LOW);
  digitalWrite(STEPPER_PIN_4, LOW);
  break;
  case 3:
  digitalWrite(STEPPER_PIN_1, HIGH);
  digitalWrite(STEPPER_PIN_2, LOW);
  digitalWrite(STEPPER_PIN_3, LOW);
  digitalWrite(STEPPER_PIN_4, LOW);

step_number++;
  if(step_number > 3){
    step_number = 0;
  }
}