Smart Safety Monitoring system for Sewage Workers

We are living in a technology-based society where we have lots of innovative ideas day by day. These new innovations in IoT communications-based projects, come as an ever-growing network that strives constantly to share and gather insight on the latest trends in the industrial IoT Platform.

IoT or the internet of things is characterized as a forthcoming innovation that empowers us to control equipment gadgets through the Internet. Sewage Cleaning is said to be one of the most dangerous jobs all over the world. Most of the cities adopted the underground drainage system and it’s the duty of the Municipal Corporation to maintain the cleanliness, health, and safety of cities. If the drainage system is not properly managed then pure water gets contaminated with drainage water and infectious diseases may spread.

The underground environment of the sewage system is quite risky and unpleasant. Drainage cleaning people are not aware of the risk by a sudden attack of poisonous gas since the gasses are odorless if exposed for a long time which may cause serious health problems. Due to the lack of using a proper gas leakage detection system, a number of dangerous accidents occurred during the last few decades. To overcome all these problems an effective monitoring system is needed in the drainage channels.

Here we design an IoT-based Smart Safety Monitoring System for Sewage Workers that comprises gas sensors like Carbon Monoxide, Hydrogen sulfide sensors, and Methane, one Heart Beat sensor used to Calculate the pulse rate of a Human. The proposed system shows indication in the LCD Display if it detects the presence of highly toxic gasses beyond the threshold level.


  • To provide safety for sewage workers 
  • To avoid deaths of sewage workers due to toxic gasses. 
  • To develop a cost friendly system. 
  • To find the location of the worker in the sewage tunnel. 
  • To update the readings in real-time over the ThingSpeak analysis tool. 
  • To alert the worker if any parameters exceed. 
  • As soon as parameters exceeds, SMS alert is sent via GSM module


A sewage system is an underground system of pipes commonly used to transport wastewater from homes and businesses either to a treatment facility, where the water is treated and released into natural water bodies like lakes and streams, or in any river to permanently drain out from the area.

The lack of prior caring of sewage work is the witness for the deaths of thousands of sewage cleaners throughout the year from accidents and various diseases such as hepatitis and typhoid due to sudden or sustained exposure to hazardous gasses like CO, hydrogen sulfide, methane.

Arduino Uno functions as the heart of the project. It allows reading sensor data from sewage, such as ppm values obtained from MQ2 and MQ136 sensors. Arduino also reads values from the heart sensor and Temperature sensor to detect the pulse of the person and temperature respectively. These parameters are also updated to the server at the same time using the ThinkSpeak IoT platform.

The device includes a GPS module for tracking the worker’s position. When the values exceed the threshold values, the GSM module sends an SMS alert to the specified mobile number. The warning specifies the coordinates of the worker’s location. The intelligence of sensors and systems will identify the clogging inside the drainage system and will give the details of the location and other information for further actions.

The system will also sense the presence of various harmful gasses such as Methane (CH4), Sulphur dioxide (SO2), Carbon monoxide (CO), etc. As the level of such gasses passes the threshold value the system will generate the alert using an alarm system by which the Health Department will take proper action on it.


  • Arduino Uno:

Arduino Uno is an open-source based on the Microchip ATmega328P developed by Arduino. cc. The current version of Arduino Uno comes with a USB interface, 14 digital I/O pins, 6 analog pins, an ICSP header, 16 MHz ceramic resonator, a power jack, and a reset button. And an Atmega328 microcontroller is used to connect with external electronics circuits.


A temperature sensor is designed as an electronic device that measures the temperature of its environment and converts the input data into electronic data to record monitor or signal temperature changes. The DHT 11 is a low-powered electronic device that lets us get the value of the temperature and the moisture. The sensor consists of a capacitive humidity sensor and a Thermistor connected to a high-performance 8-bit microcontroller. 


A Heart Beat Sensor is one of the common sensors used to detect the heartbeat per minute. It provides a digital output of the heartbeat. This Heartbeat sensor comes with a bright infrared (IR) LED and a phototransistor to detect the pulse of the finger. The phototransistor in the sensor detects the presence of light, which means, how much light is passing through a finger. When blood passes through the finger, the number of light changes, and that change can be detected as a pulse.

  • WiFi Module:

  ESP8266 Wifi Module AP & Station Remote Serial Wireless IoT Board designed based on an integrated chip specifically to fulfill the needs of a new connected world. It can handle all the necessary overhead for communicating with your network, such as TCP/IP stack and communicating with your 802.11 networks. The  ESP8266  WiFi Module is a self-contained SoC with an integrated  TCP/IP protocol stack that can give access to your WiFi network (or the device can act as an access point). One useful feature of Uno WiFi is support for  OTA (over-the-air) programming, either for the transfer of Arduino sketches or WiFi firmware.


The buzzer is a sounding device that can convert audio signals into sound signals. It is usually powered by DC voltage. In our system, a buzzer beeps out when the wrong RFID card comes in contact with the door system


The GSM module is responsible for sending the data from the sensors to the webserver. The GSM module makes use of network connectivity in the form of GPRS data and sends the data to a specified IP address of the server. GSM Module is used to establish communication between a computer and a GSM system. Global System for Mobile communication (GSM) is an architecture used for mobile communication.


A GAS sensor or a GAS Detector is defined as a chemical sensor that detects/measures the concentration of gas in its vicinity. Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. Gas sensors are employed in factories and manufacturing facilities to identify gas leaks and to detect smoke and carbon monoxide in homes.


In the circuit, the Arduino board and LCD module need a 5V regulated DC while relays need 12V regulated DC for their operation. The AC mains is used as the primary source of power. The supply from the mains is stepped down by a transformer and rectified by a full-bridge rectifier. The rectified output is regulated to 5V and 12V using 7805 and 7812 ICs.


  • Reducing the risk of sewage workers
  • Visual display using LCD display unit.
  • Gas sensor present  indicates the presence of Toxic Gasses
  • All the sensor parameters can be viewed online in graphical notation.
  • Efficient and low cost design.
  • Fast response.
  • User friendly.
  • Better control on overall internal process

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