Data loggers

it covers data logger applications future scenario and a research paper also covers difference between data logger and data acquisition system

1. DATA LOGGERS PRESENTED BY: ARCHIT BHARTI (ME MODULAR 2020) R.N. 201502 ARUN(ME MODULAR 2020) R.N. 201503

2. Contents Introduction and Features How data is collected Block Diagram Data Logger Topologies How to R etrieve Data Data Logger vs Data Acquisition Data Logger applications

3. Contents(contd.) Current Scenario Future Aspects Advantages and Disadvantages Research Paper References

4. Introduction The term data logging refers to collecting or gathering data over period of time. A data logger is a device used to store and retrieve data. Data loggers capture, measure and analyze physical phenomena from the real world. Light, temperature and pressure are examples of the different types of signal that data logger can measure.

5. Introduction(contd.) It uses built in instrument or sensor or via external instruments and sensors to collect data. A data logger is often a hand held battery powered, portable, and equipped with a microprocessor, internal memory for data storage, and sensors.

6. Features It is quick and efficient. It is pretty accurate to store information. It is small and portable. It is battery powered. It contains microprocessor, internal memory for data storage. It stores data in digital format.

7. How data is collected Data logging is done to collect information of physical quantities like temperature, humidity,Co2 Level etc. in order to do this we need a low cost portable data logger. Sensors are used to take readings or measurements at regular interval of their environment. Sensors may be analog or digital. If they take analog reading, a analog to digital converter will be needed to convert the signal into digital data which a computer can understand .

8. How data is collected(contd.) As the sensor takes reading data is sent through a cable or wireless link to the data logger. The device is designed to receive data from sensors and to store the results on external memory for post process analysis. LCD is also used for real time display of data acquired from various sensors.

9. How data is collected(contd.) Sensors collect data of temperature,pressure,humidity,wind speed,water current,electric voltage,ph reading etc. Data loggers vary between general purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. G eneral purpose types of data loggers are programmable.

10. Block Diagram

11. Blocks of Data Logger Transducer or Sensor : A device that converts a physical phenomenon such as light temperature,pressure or sound into a measurable electric signal such as voltage or current. Analog to Digital Converter: The data loggers senses only digital signals and hence analog signals are converted in digital signals. Microcontroller and Storage: Microcontroller is used to convert digital signals into binary form,storage used to store

12. Blocks of Data Logger(contd.) the converted digital signal. Display : Some data loggers interface with a personal computer, and use software to activate the data logger and view and analyze the collected data, while others have a local interface device like LCD and can be used as a stand-alone device .

13. Example of Data Logger Health care logistics 14147 Temperature and Humidity

14. Installation and Indication

15. Installation and Indication

16. Data Logger Topologies Stand Alone : Stand alone hardware can continuously measure and log data without connection to a PC PC Based: Operation requires full time connection to a PC over any appropriate technology.

17. How long can data loggers record? T he recording duration depends on the memory capacity of the data logger and the desired sample rate. To determine the duration, divide the memory capacity (number of samples the device can record) by the sample rate. As an example, assume that a given data logger can store 10,000 samples. If you want to record two samples every minute, the data logger can run for 10,000/2 or 5,000 minutes (about 3.5 days ).

18. How to retrieve data off your data logger Depending on the type of data logger, you can either access the data directly within the data logger and even print it out, connect the data logger to a computer to extract the data, or data can be wirelessly transmitted in real-time to any connected device . Data loggers can collect data independently of a computer. Data is normally collected in non-volatile memory for later download to a computer. The computer does not need to be present during the data collection process. This makes them ideally suited for applications requiring portability.

19. Data Logger Display and Access If you merely want to log data, you do not need a data logger with a display. However, if you want to be able to see the temperature, you will need a data logger with a display. How you gain access to logged data is another important consideration. To access and download data from the data logger there are four options.

20. Data Logger Display and Access USB DATA LOGGERS : It is compact, reusable, and portable, and offer low cost and easy setup and deployment.  It is plugged directly into a USB port on a PC for configuration and data downloading.

21. Bluetooth loggers It is compact, reusable, portable, easy to set up and deploy, and transmit data wirelessly to mobile devices over a 100-foot range. It is used in limited access areas .

22. Web-based data loggers It is remote, around-the-clock, internet-based access to data via cellular, WI-FI, or Ethernet communications .( a wired option that would allow you to directly connect your computer to a data logger. However, running an Ethernet cable can be costly or time-consuming versus other options .)

23. Wireless sensors It transmits real-time data from dozens of points to a central computer or gateway. It reduces manual retrievation of data.

24. SD Card Data Loggers You can extract the SD card without taking the data logger with you.

25. Data logging versus data acquisition A data logger is a data acquisition system, but a data acquisition system is not necessarily a data logger. Data loggers typically have slower sample rates. A maximum sample rate of 1 Hz may be considered to be very fast for a data logger, yet very slow for a typical data acquisition system. Data loggers are implicitly stand-alone devices, while typical data acquisition system must remain tethered to a computer to acquire data.

26. Data logging versus data acquisition(Contd) Data logger has longer recording time as compare to DAQ system. Data loggers are usually battery powered and DAQ system are externally AC/DC Powered. Data loggers are of low cost as compare to DAQ system. Data loggers input are very few core type and DAQ systems has broad range of inputs. Data loggers used magnetic tape, punched paper tape, directly viewable recorder such as strip chart recorder and DAQ used static RAM, flash Memory , EEPROM.

27. Applications of data loggers It is used in weather stations to record wind speed, rainfall, temperature, relative humidity, radiation, Air Quality Index (AQI) etc. It is used for hydrographic recording to record water level, depth, flow, pH, conductivity etc. It is used in wildlife and forest monitoring to record number and activities of animals to prevent them from poaching. It is used in scientific, research, experimental works like to record growth of plants, time for isotropic changes, interaction of chemicals etc. It is used in various industries to monitor the risk zone, to test leakage and fitting like in nuclear power plants.

28. Applications of data loggers

29. Applications of data loggers Provide building maintenance information on heating, ventilation, and air conditioning operations to assist with energy conservation. It is also used in automatic information delivering areas. It is used for environmental monitoring to record landslide, earthquake, flood, pollution etc. It also has application in civil engineering fields like for structural health monitoring, tunnel monitoring, deformities in dam, road and bridge etc. Monitor vaccine storage in a medical facility . Monitor the temperature of food To record gas pressure and to monitor tank levels .

30. Current scenario Nowadays, it is required to control the temperature, pressure, humidity, displacement, etc. in a plant, hence demand of data logger is increasing rapidly since it finds a wide application in industries. The cost of data loggers has been declining over the years as technology improves and costs are reduced. Simple single channel data loggers cost as little as $25. More complicated loggers may costs hundreds or thousands of dollars.

31. Future Aspects Data Loggers are changing more rapidly now than ever before. The original model of a stand alone data logger is changing to one of a device that collects data but also has access to wireless communications for alarming of events, automatic reporting of data and remote control . Figure: Data Logger Application for weather Station

32. Advantages Readings can be continually taken over long periods, 24 hours a day, 365 days of the year. There is no chance of somebody forgetting to take a reading Readings will be more accurate if a computer takes them because there is no chance of human error Sensors can be placed in locations where it is dangerous for humans to go Time intervals for collecting data can be very frequent and regular, for example, hundreds of measurements per second. Data logging is often more accurate because there is no likelihood of human error . Data collection can be automatic so no human presence is necessary

33. Disadvantages If the data logging equipment breaks down or malfunctions, some data could be lost or not recorded. Equipment can be expensive for small tasks. The equipment will only take readings at the logging interval which has been set up. If something unexpected happens between recordings, the data will not be collected. Data loggers typically have slower sample rates than Data Acquisition System .

34. Research Paper on Data Loggers Topic : Advancement in Data Logger System. Abstract : T his paper aims to develop a low cost, many channel data logging system which can store data for future use. ESP32 microcontroller is used to make advancement in this system . This system sends the stored data to the addressed mail through Wi-Fi Through this device we can log any physical or environmental parameters for the particular period of time . I n the old version, the data logger is physically connected to the computer. The system proposed in this paper is an advanced solution for monitoring the physical or environmental parameters at a particular place and display the information anywhere in the World

35. References Advancement in Data Logger System by Amruta Chore, Tejaswi Vichare , Vaibhav Mohite , Pallavi Nilange . Practical Data Acquisition for instrumentation and control systems by John Park and Steve Mackay. https:// www.omega.com/en-us/resources/data-loggers. https:// deweso.ft.com/daq/data-logger-vs-daq-system. Fundamentals of Industrial Instrumentation by Alok Barua Wiley India.

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