Kitchen Safety Monitor using Wio Ternimal

Measure the temperature and CO level of kitchen using sensors and Wio Terminal, providing warning of a possible gas leak or fire

BeginnerFull instructions provided3 hours222

Kitchen Safety Monitor using Wio Ternimal

Things used in this project

Hardware components

Seeed Studio Wio Terminal

Seeed Studio Grove - Temperature Sensor

Seeed Studio Grove - VOC and eCO2 Gas Sensor SGP30

Software apps and online services

Arduino IDE

Story

Kitchen is a place where we use fire and electricity in our daily life. So kitchen areas are high-risk for gas leaks, fires and other accidents. If not detected and dealt with in a timely manner, it may cause damage to personal and property safety. Therefore, it is necessary to design a kitchen safety monitoring system to address safety issues related to kitchens, for preventing the expansion of accidents and reducing losses. This project uses gas and temperature sensors to measure the temperature and CO level in the kitchen in real-time, providing immediate warning of a possible gas leak or fire, and people can check the cause of the leak and take appropriate safety measures.

Principle of detection

1. Principle of gas detection

The main components of gas are carbon monoxide (CO), hydrogen and methane. When the concentration of CO in a room increases to a certain level, it will bring danger to people's lives.

A person inhaling a concentration of 220mg/m3 of carbon monoxide can be poisoned in one hour; inhaling a concentration of 1800mg/m3 can be fatal in one hour; when the concentration reaches 14080mg/m3, it can "flash death" in one minute. When the concentration of CO reaches 35ppm in the air, it can cause damage to the human body and lead to carbon monoxide poisoning (also known as gas poisoning).

This project uses a gas sensor to measure the concentration of CO in the air and when it reaches 35ppm, a buzzer will be activated for warning.

2. Principle of fire detection

The combustion of substances during a fire generates a large amount of heat and causes a change in the surrounding temperature. A temperature-sensitive detector is a fire detector that responds to a change in temperature around a point or line in the warning range. There are about 20 types of temperature-sensitive detectors classified by temperature range, the common ones are A1, A1R and A2, A2R. The lower limit of action temperature of A1 is 54°C and the upper limit of action temperature is 65°C; the lower limit of action temperature of A2 is 54°C and the upper limit of alarm temperature is 70°C.

This project measures the temperature through a temperature sensor, activating the buzzer when the temperature reaches 54°C.

Features

Real time detection of current CO concentration and temperature
If the CO concentration is greater than 35ppm, a buzzer will be activated and the fan will be turned on to ventilate the air, the LCD screen will show "gas leak risk".
If the temperature is above 54°C, a buzzer is activated and the LCD screen displays "fire risk"

Flowchart

Material

Wio Terminal

Wio Terminal is an ATSAMD51-based microcontroller with both Bluetooth and Wi-Fi Wireless connectivity powered by Realtek RTL8720DN, compatible with Arduino and MicroPython.

Wio Terminal is integrated with a 2.4” LCD Screen, microphone, and buzzer. On top of that, it has two multifunctional Grove ports for Grove Ecosystem so it's convenient for us to connect Grove sensors as a beginner. All of these practical add-ons are carefully housed in a compact enclosure, saving more energy for us.

Sensors

We use 2 Groves sensors to measure temperature and CO level.

Project in usage

Setup Hardware & Software

Thanks to Grove ports, setting up hardware is an easy thing without a breadboard or soldering. We just connect Wio Terminal and the sensors using 4 Pin unbuckled cable.

And as Wio terminal is compatible with Arduino, we use Arduino to run this project. The code is shown at the bottom of this page.

Here you can see the warning when there is a risk of fire or gas leak.

When there is fire risk

When there is gas leak risk

Code of Kitchen Safety Monitor Project

#include "TFT_eSPI.h"
#include <Multichannel_Gas_GMXXX.h>
#include <Wire.h>
GAS_GMXXX<TwoWire> gas;
TFT_eSPI tft;
unsigned int Val;
const int B = 4275;                   // B value of the thermistor
const int R0 = 100000;                // R0 = 100k
const int pinTempSensor = A0;         // Grove - Temperature Sensor connect to A0
TFT_eSprite spr = TFT_eSprite(&tft);  // Sprite
void setup() {
  tft.begin();
  Wire.begin();
  tft.setRotation(3);
  gas.begin(Wire, 0x08);
  pinMode(WIO_BUZZER, OUTPUT);
  Serial.begin(9600);
  tft.fillScreen(0x39F);
  tft.setTextSize(3);
  tft.setRotation(3);
  tft.setTextColor(0xFFFF);
}



void loop() {
  spr.fillSprite(TFT_BLACK);
  spr.setFreeFont(&FreeSansBoldOblique18pt7b);
  spr.setTextColor(TFT_BLUE);

  int a = analogRead(pinTempSensor);
  float R = 1023.0 / a - 1.0;
  R = R0 * R;
  Val = gas.getGM702B();
  float CO = gas.calcVol(Val);
  Serial.print("CO: ");
  Serial.print(CO);
  Serial.println(" ppm");
  float temperature = 1.0 / (log(R / R0) / B + 1 / 298.15) - 273.15;  // convert to temperature via datasheet

  Serial.print("temperature = ");
  Serial.println(temperature);

  delay(100);

  if (temperature > 54) {

    tft.fillScreen(0x39F);
    tft.setTextSize(3);
    tft.drawString((String) "A fire risk", 25, 100);
    tone(WIO_BUZZER, 262);
    delay(1000);
    noTone(WIO_BUZZER);

  } else if (CO > 35) {

    tft.fillScreen(0x39F);
    tft.setTextSize(3);
    tft.drawString((String) "A gas leak risk", 25, 100);
    tone(WIO_BUZZER, 262);
    delay(1000);
    noTone(WIO_BUZZER);

  } else if (temperature > 54 & CO > 35) {

    tft.fillScreen(0x39F);
    tft.setTextSize(2);
    tft.drawString((String) "Fire and gas leak risk", 25, 100);
    tone(WIO_BUZZER, 262);
    delay(1000);
    noTone(WIO_BUZZER);


  } else {

    tft.fillScreen(0x39F);
    tft.drawString((String) "Temperature:", 40, 70);
    tft.drawFloat(temperature, 2, 40, 100);
    tft.drawString((String) "C", 140, 100);

    tft.drawString((String) "CO:", 40, 140);
    tft.drawFloat(CO, 2, 40, 170);
    tft.drawString((String) "ppm", 140, 170);
  }



  delay(2000);
}