Our projects main focus is kitchen safety while in the process of cooking.
Why did you decide to make it?
We decided to go this route with the project because it offered a clear and meaningful goal of peace of mind in the kitchen. With this system, even when away, the user can have confidence that any abnormalities in the kitchen will be reported swiftly and the user is able to distinguish between events. In the day and age where everything is becoming automated, it just makes sense to have a system double-checking you in the kitchen.
How does it work?
The system uses three sensors, each contained in its own closed-circuit, which communicate and respond to each other based on the conditions of the environment around them. In total the system uses a Gas/Smoke sensor, Temperature sensor, and a motion sensor to effectively monitor the surroundings. The sensors used were the KY-028 temperature sensor, HC-SR501 Motion Sensor, and the Grove MQ-2 gas sensor. What occurs in the system is the motion sensor first outputs its value to the cloud, which is read by the temperature sensor module. Once the temperature reaches a certain point (stove is on), then the temperature sensor module will signal the motion sensor module either "Alarm" or "Noalarm" to toggle the LED on that module depending on the motion value the temperature module received. If the temperature is not sufficiently high only "Noalarm" signals will be sent. If the gas detecting module detects gas and receives that there is no motion, it sends "gas detected" to the temperature module which will signal "Alarm" to the motion sensor module to cut on the LED. The gas sensor module only receives and checks the motion data in order to meet the project requirements of bi-directional communication. In actual use, the gas detector would just set off the alarm regardless of the other two sensors.
Temperature Sensor Setup
The temperature sensor has a live feed to ThingSpeak graphing the analog output which represents the voltage of 0-3.3V shown as a range of 0-4096.
This is the temperature sensor code. It receives data from the motion sensor, then using the temperature data will output to the cloud either "Alarm" or "Noalarm".
inttemp;chartempstr[30];// the setup routine runs once when you press reset:voidsetup(){pinMode(A0,INPUT);pinMode(D2,OUTPUT);pinMode(D3,INPUT);// initialize serial communication at 9600 bits per second:Serial.begin(9600);Particle.variable("temp",temp);Particle.subscribe("motion",myHandler,("e00fce68e492a4e6bb553c3d"));Particle.subscribe("smoke/gas present",myHandler,"e00fce6839934a33c1772922");}voidmyHandler(constchar*event,constchar*data){if((strcmp(data,"motion")==0))digitalWrite(D2,HIGH);if((strcmp(data,"Smoke or Gas Detected in Kitchen")==0))Particle.publish("temp,""Alarm",PRIVATE);elsedigitalWrite(D2,LOW);}// the loop routine runs over and over again forever:voidloop(){intMotionValue=digitalRead(D3);// read the input on analog pin 0:intsensorValue=analogRead(A0);// print out the value you read:Serial.println(sensorValue);delay(2000);// delay in between reads for stabilitytemp=sensorValue;Stringtemp1=String(temp);Particle.publish("temp1",temp1,PRIVATE);if(temp<650&&MotionValue==LOW)Particle.publish("temp","Alarm",PRIVATE);elseParticle.publish("temp","NoAlarm",PRIVATE);}
Smoke/Gas Sensor
C/C++
This is the code for the smoke/gas alarm component of the system. It detects changes in the nearby air and publishes events to the cloud based on readings from the sensor.
intsmokeAnalog=A0;intWarningLight=D7;//sets variables for pinsintsmokeDigital=D2;voidsetup(){pinMode(WarningLight,OUTPUT);pinMode(smokeDigital,INPUT);//sets input and output pinspinMode(smokeAnalog,INPUT);digitalWrite(WarningLight,HIGH);delay(1500);//3 SLOW blinks to let user know system is turning ondigitalWrite(WarningLight,LOW);delay(1000);digitalWrite(WarningLight,HIGH);delay(1500);digitalWrite(WarningLight,LOW);delay(1000);digitalWrite(WarningLight,HIGH);delay(1500);digitalWrite(WarningLight,LOW);delay(15000);//15s delay allows sensor to warm-updigitalWrite(WarningLight,HIGH);//3 FAST blinks to signal accurate data aquisitiondelay(300);digitalWrite(WarningLight,LOW);delay(150);digitalWrite(WarningLight,HIGH);delay(300);digitalWrite(WarningLight,LOW);delay(150);digitalWrite(WarningLight,HIGH);delay(300);Particle.variable("analogvalue",smokeAnalog);//sets variables to be called and uploaded to consoleParticle.variable("digitalvalue",smokeDigital);Particle.subscribe("motion",myHandler,("e00fce68e492a4e6bb553c3d"));}voidloop(){smokeAnalog=analogRead(A0);//these variables will be updated at the beginning of each loop based on pin valuessmokeDigital=digitalRead(D2);delay(1000);if(smokeAnalog>2850)//if analog value exceeds tested smoke value, the LED will be lit{digitalWrite(WarningLight,HIGH);Particle.publish("smoke/gas present","Smoke or Gas Detected in Kitchen",PRIVATE);}else{digitalWrite(WarningLight,LOW);Particle.publish("no smoke/gas","All Clear",PRIVATE);}delay(2000);//wait 2s for next reading}voidmyHandler(constchar*event,constchar*data){if((strcmp(data,"motion")==0))Particle.publish("no smoke/gas","All Clear",PRIVATE);// This is added to 1. Keep the smoke detector from setting off the Alarm when you're present, cause if there is a fire you'll--// see it and probably dont want an alarm in your ear frustrating you even more. 2. Added to compete 2 sets of bi-directional comms.}
Motion Sensor
C/C++
The code for the motion sensor receives the digital output from the motion detector, then outputs it to the cloud as either "motion" or "nomotion". It receives from the cloud either "Alarm" or "Noalarm" which controls whether or not to turn on the LED.
intmotion;voidsetup(){;Particle.variable("motion",motion);pinMode(D6,INPUT);pinMode(D5,OUTPUT);pinMode(D3,OUTPUT);Particle.subscribe("temp",myHandler,"e00fce683f281150ed690fe9");Particle.subscribe("smoke/gas present",myHandler,"e00fce6839934a33c1772922");}// the loop routine runs over and over again forever:voidloop(){intmotion=digitalRead(D6);digitalWrite(D5,motion);if(motion==HIGH)Particle.publish("motion","motion",PRIVATE);elseif(motion==LOW)Particle.publish("motion","nomotion",PRIVATE);delay(1000);}voidmyHandler(constchar*event,constchar*data){if((strcmp(data,"Alarm")==0))digitalWrite(D3,HIGH);if((strcmp(data,"Smoke or Gas Detected in Kitchen"))==0)digitalWrite(D3,HIGH);elsedigitalWrite(D3,LOW);}
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