We are solving the problem of preventing burn injuries with the use of a PIR motion sensor, and an IR contact less temperature sensor. When the IR temperature sensor detects a temperature greater than 40 degree Celsius and a motion is detected by the PIR motion senor at the same time, the external LED and the D7 pin on the Argon board will light up. By doing so the system will notify the user to prevent themselves from touching the hot appliance and prevent burn injuries.
Motion/Temperature/LEDs Display Video
How is it useful?
Our project is useful in the sense that the LEDs will light up whenever motion is detected at the same time that the temperature has exceeded its threshold. This will therefore prevent any burn injuries from taking place. The data we are collecting is the amount of instances both the motion and temperature sensors are being triggered. The reasoning behind this is shown in the graphs below, where in the instances that the temperature sensor was detected alone there was no data from the motion sensor. That is because there was no motion detected, for the motion sensor to be triggered therefore neither of the LEDs were triggered either. In the second half of the graph, it is shown that both of the sensors were triggered resulting in both of the LEDs lighting up which shows this is a useful system. In the screen captures of the email shown below, it displays a message saying that motion has been detected.
A common issue that both members of the project faced were the common instances of burning their hand whenever using hot appliances. Therefore they decided to create a system that would notify them every time they were about to pick up a hot appliance at temperature of 40 degrees Celsius or higher. Preventing them from getting burned.
How it works:
On the first Argon board it has the connections of the PIR motion sensor and the external LED with the 220 ohm resistor and the D7 LED on the Argon board. The PIR motion sensor has three connections, first connection is the voltage which is connected to 3.3 V. The second connection is the "data" it is connected to the D2 pin. Lastly, the third connection is connected the GND pin. The external LED is in series with a 220 ohm resistor, this is connected to D4 and GND.
PIR Motion Sensor and LEDs
Side view of PIR Motion Sensor and LEDs
On the second Argon board it has the connection of the MLX90614 temperature sensor. The temperature sensor has four connections. First connection being the SDA pin, second connection is the SCL pin, third connection is the GND and fourth connection is voltage of 3.3 V.
This code was generated to detect motion. Once motion is detected the code was informed to light the external LED and the D7 LED pin.
intinputPin=D2;// choose the input pin (for PIR sensor)intledPin=D4;// LED PinintpirState=LOW;// we start, assuming no motion detectedintval=0;// variable for reading the pin statusintcalibrateTime=5000;intCount=0;// wait for the thingy to calibratevoidsetup(){pinMode(D2,INPUT);pinMode(D7,OUTPUT);pinMode(D4,OUTPUT);Particle.subscribe("Hot",test1);// declare sensor as input}voidloop(){val=digitalRead(D2);}voidtest1(constchar*event,constchar*data){if(val==HIGH){// the current state is no motion// i.e. it's just changed// announce this change by publishing an event// we have just turned on //digitalWrite(D7,HIGH);// delay(20000);// digitalWrite(D7,LOW); Count++;//count = count +1Particle.publish("PhotonMotion","Motion Detected",PRIVATE);delay(1000);//for(i=0;i<80;i++) {digitalWrite(D4,HIGH);digitalWrite(D7,HIGH);delay(500);//wait for 1msdigitalWrite(D4,LOW);digitalWrite(D7,LOW);//digitalWrite(D5,HIGH);//delay(500);//wait for 1ms}}
Temperature Sensor
C/C++
This code was generated to publish an event of "Hot" whenever temperature detected exceeded 40 degrees Celsius.
// This #include statement was automatically added by the Particle IDE.//LEDwithTemp#include<Adafruit_MLX90614.h>floatobject_tempc;Adafruit_MLX90614mlx=Adafruit_MLX90614();voidsetup(){mlx.begin();}voidloop(){object_tempc=mlx.readObjectTempC();if(object_tempc>40.0){Stringtemperature=String(object_tempc);Particle.publish("Hot","temperature",PRIVATE);digitalWrite(D2,HIGH);// publish to cloud}//Serial.print("Ambient = "); Serial.print(mlx.readAmbientTempF());//Serial.print("*F\tObject = "); Serial.print(mlx.readObjectTempF()); Serial.println("*F");delay(1500);}
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