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Wireless greenhouse environment monitoring through sensors

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Wireless greenhouse environment monitoring through sensors

  1. 1. Raj Kumar Goel Institute Of Technology Presented by:- Sudhanshu Tripathi Varun Gupta Shivam Tripathi Anurag Singh “Wireless Greenhouse Environment Monitoring through Sensors” A Presentation on (EEE Department)
  2. 2. Wireless Greenhouse Environment Monitoring through Sensors
  3. 3. Micro Controller Soil moisture Sensor Humidity Sensor Temperature Sensor Light sensor Sprayer Water Pump Encod er HT12 E AC O U T P U T D R I V E R Light 16*2 LCD RF Transmitter RF Receiver DECO DER HT12 D
  4. 4. Parts: Sensors (Data acquisition system)  Temperature sensor (LM35)  Humidity sensor (HIH4000)  Light sensor (LDR)  Moisture sensor Microcontroller (AT89C52) Liquid Crystal Display (Hitachi's HD44780) Actuators – Relays
  5. 5. Devices controlled :  Water Pump (simulated as a bulb)  Sprayer (simulated as a bulb)  Cooler (simulated as a fan)  Artificial Lights (simulated as 2 bulbs)
  6. 6. Sensors: This part of the system consists of various sensors, namely soil moisture, humidity, temperature and light. These sensors sense various parameters- temperature, humidity, soil moisture and light intensity and are then sent to the Analog to Digital Converter.
  7. 7. Microcontroller: The microcontroller is the heart of the proposed embedded system. It constantly monitors the digitized parameters of the various sensors and verifies them with the predefined threshold values and checks if any corrective action is to be taken for the condition at that instant of time. In case such a situation arises, it activates the actuators to perform a controlled operation.
  8. 8. Display Unit: A Liquid crystal display is used to indicate the present status of parameters and the respective AC devises (simulated using bulbs). The information is displayed in two modes which can be selected using a push button switch which toggles between the modes. Any display can be interfaced to the system with respective changes in driver circuitry and code
  9. 9. Working: Power supply: The power supply section consists of step down transformers of 230V primary to 12V secondary voltages for the +5V power supplies respectively. The stepped down voltage is then rectified by 4 1N4007 diodes. The high value of capacitor 1000 µF charges at a slow rate as the time constant is low, and once the capacitor charges there is no resistor for capacitor to discharge. This gives a constant value of DC. IC 7805 is used for regulated supply of +5 volts in order to prevent the circuit ahead from any fluctuations. The filter capacitors connected after this IC filters the high frequency spikes. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating.
  10. 10. Temperature sensor: A temperature sensor (LM35DZ) can measure from 0°C to 100°C. However, the output is 0V at 2°C. Hence the measurable temperature is above 2°C. The output of a sensor goes up by 10mV for every 0°C. The output voltage in 32°C is 300mV. The output voltage of a sensor is amplified by an operational amplifier, and is inputted into the base of transistor .The temperature sensitivity adjusting the gain of an operational amplifier by VR. So in the normal mode when temperature is below 60C the output or LM358 is not sufficient to drive transistor BC 548. When temperature raises above 60C the output of LM358 is about 3V which is sufficient to drive transistor thus microcontroller get positive voltage.
  11. 11. Soil moisture sensor: This sensor is based on the fact that water is not pure water which is non conductor, but it is impure which is slightly conductor. Water sensor is nothing but a series of very close PCB tracks. In normal mode these tracks are not conducting, but when some water fall on these tracks these line slightly start conducting and some positive voltage is available at the base of transistor So NPN transistor is on and NPN transistor provide a negative voltage as a pulse to the microcontroller.
  12. 12. Humidity sensor: The humidity sensor SYS-1used for sensing the humidity. It delivers instrumentation quality RH (Relative Humidity) sensing performance in a low cost, solderable SIP (Single In-line Package). Relative humidity is a measure, in percentage, of the vapour in the air compared to the total amount of vapor that could be held in the air at a given temperature.
  13. 13. Features: • Linear voltage output vs. %RH • Laser trimmed interchangeability • Low power design • High accuracy • Fast response time • Stable, low drift performance • Chemically resistant • The RH sensor is a laser trimmed, thermoset polymer capacitive sensing element with on-chip integrated signal conditioning.
  14. 14. Light intensity sensor: The light intensity in the green house is sensed by a photo sensor and a signal in the form of voltage is sent to the microcontroller. This signal is scaled in such a way that 5V is generated in the day lit environment. The lamp is dimmed based on this signal. A photo sensor is a complete assembly that includes the optical arrangement and electronic circuitry that is coupled to an electronic component called a photocell. A photocell is a light responding silicon chip that converts incident radiant energy into an electrical signal. Photo sensor includes a diffuser or lens that collects light and an optical filter that rejects the UV and IR spectra. The electronic circuitry amplifies the dc voltage generated by the photocell, and after comparing it with a reference voltage, sends an appropriate signal to the control device.
  15. 15. Microcontroller: The PIC family of microcontrollers is based on an architecture which is highly optimized for embedded control systems. It is used in a wide variety of applications from military equipment to automobiles to the keyboard. The manufacturers have added numerous features and peripherals to the PIC such as I2C interfaces, analog to digital converters, watchdog timers, and pulse width modulated outputs. Variations of the PIC with clock speeds up to 40MHz and voltage requirements down to 1.5 volts are available. This wide range of parts based on one core makes the 8051 family an excellent choice as the base architecture for a company's entire line of products since it can perform many functions and developers will only have to learn this one platform.
  16. 16. The 16f877a is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. The device is manufactured using Microchip high-density nonvolatile memory technology and is compatible with the industry standard PIC 16f877a provides a highly-flexible and cost effective solution to embedded control applications. In addition, the 16f877a is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM con-tents but freezes the oscillator, disabling all other chip functions until the next interrupt or hardware reset.
  17. 17. Display section: The display section consists of 16*2 LCD, which used to display Summary of IC being Inserted and result of test being conducted. LCDs can add a lot to your application in terms of providing an useful interface for the user, debugging an application or just giving it a "professional" look. The most common type of LCD controller is the Hitachi 44780 which provides a relatively simple interface between a processor and an LCD.
  18. 18. Thank You

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