datalogger-171219094658 used for agriculture

data logger used for agriculture

1. DATA LOGGER PRESENTED BY: DILIP MATHURIA

2. The term ‘Data Logging' refers to collecting or gathering data over a period of time. A data logger is a device that can be used to store and retrieve the data. Data loggers capture, measure, and analyze physical phenomena from the real world. Light, temperature and pressure are examples of the different types of signals that a Data logger can measure. A data logger is often a hand-held battery operated device which has a large amount of memory. INTRODUCTION

3. How Data is Collected? The objective of this work is to use data logging for temperature measurement. In order to meet the above requirements, a low cost, portable data logger is designed A microcontroller based data logger has been developed for measuring temperature at different input channels of ADC Sensors are used to take readings or measurements at regular intervals of their environment. The sensors may be either analogue or digital. If they take analogue readings, an Analogue to Digital Converter will be needed to convert the signal into digital data which the computer can understand.

4. As the sensor takes a reading, the data is sent though 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 non-volatile flash memory for post process analysis. An integrated Liquid crystal display (LCD) is also used for real time display of data acquired from various sensors. The sensors can be collected data on a wide range of things such as temperature, humidity, pressure, wind speed, water currents, electrical voltage, pH readings etc. CONTINUED

5. Sensor 1 Sensor 2 STORAGE DISPLAY ADC MICRO CONTROLLER ADC DISPLAY Block Diagram

6. Building blocks of a data logger Transducer or Sensors: A device that converts a physical phenomenon such as light, temperature, pressure, or sound into a measurable electrical signal such as voltage or current. Analog to Digital Converter: The data logger senses only digital signals and hence analog signals, it may converted to digital signal. Microcontroller & Storage: Microcontroller is used to convert digital signals into binary form, storage used to store the converted digital signal. Display: Some data loggers interface with a personal computer and utilize software to activate the data logger and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device.

7. Implementation and System Design System Definition: Broad definition of system hardware including microcontroller and its interface with display, ADC, memory, keypad etc. Circuit Design: Selection of 8051 microcontroller and other interfacing devices, as per system definition. Design of hardware circuit and its testing on laboratory kits with some simple microcontroller software routines. PCB Design and Fabrication: Generation of schematic diagrams and the production of circuit board layout data for the procurement of the circuit board. Software Design: Developing algorithm for the system, allocating memory blocks as per functionality, coding and testing. Integration and Final Testing: Integrating the entire hardware and software modules and its final testing for data logging operation .

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

9. 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.

10. 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

11. ADVANTAGES Data Logging can be used in remote or dangerous situations. Data logging can be carried out 24 hours a day, 365 days of the year. Time intervals for collecting data can be very frequent and regular, for example, hundreds of measurements per second. No need to have a person present. Data logging is often more accurate because there is no likelihood of human error.

12. 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.

13. APPLICATIONS They can be used in the following applications such as: In unattended recording at weather stations to record parameters like temperature, wind speed / direction, solar radiation and relative humidity. For hydrographic recording of water flow, water pH, water conductivity, water level and water depth. In the recording of soil moisture levels. To record gas pressure and to monitor tank levels. Vehicle Testing (including crash testing)

14. CONCLUSION They are designed to operate continuously without interruption even in the worst industrial environments. It is a portable measurement instrument, has a wide application in industries. The digital data can be retrieved, viewed and evaluated after it has been recorded. Data loggers can be taken to diverse locations include: mountains , deserts , jungles, mines, etc. The specified accuracy is maintained throughout the period of use.