Transcript the_last_presentation

Weather Station
Weather station design for measuring
weather parameters wind speed
temperature and humidity
Weather Station Team
Imad Rabayaa
Abdulmjeed Safa
Dr.Imad Braik
Outline

Definition problem .
 Layout of the design.
 ( practical & technical ) constraints of
weather station design.
 Using hardware to measure weather
parameters.
 Implementing software solutions to the
problem.
 practical tests .
Definition problem
Layout of the Design

Block diagram
Sensors
Tx
Sensors
Rx
PACK
BASE
PC
RS232
LCD
Working together

The layout of this product will offer
hardware solutions that integrate
with the power of the PC.
Pack
2.4 GHZ
PC
Base
RS 232
Practical Constraints
Type
Description
Economic
The cost to build will be 500$ approximately .
Environmental
The weather station will be able to operate in
temperatures from -30°C to 60°C.
The weather station will be constructed with
environmentally friendly products.
Sustainability
Outdoor pack will be able to withstand outside
conditions, with minimal maintenance.
Technical Constraints
Name
Description
Transmission Distance
(Pack to Base)
The distance will be 100 meters indoor.
Communication Protocol
(Base to PC)
The weather station’s base will communicate
with PC serially .
Radio Frequency
Transmission frequency will be 2.4 GHZ.
Memory Requirements
The base microcontroller will have enough
memory to store 12 hours of data.
Hard ware

Common hardware components .
- Micro controller .
- Humidity sensor.
- Temperature sensor .
 Base hardware components .
- LCD .
- Wireless (Rx) .
 Pack hardware components .
- Anemometer sensor.
- Wireless (Tx) .
LCD :Liquid Crystal Display
Common hardware components

Micro controller ( PIC 16f877 )
– 10-bit ADC module.
– Timers .
– SSP .
– USART .
– CCP.
Common hardware components

Humidity Sensor
– There are several devices used to measure relative
humidity.
- A stable design using hygrometer HS1101 with a TLC555 timer .
- RH = 565.1− 0.0767 f
RH : Relative Humidity

Humidity Circuit
Humidity Sensor (output)
RH = 50%
RH = 91%
Common hardware components

Temperature Sensor
– ICTS LM35 used in the design .
– It has an output voltage
that is proportional to the
Celsius temperature.
– Temperature (oC) = 5 * Vout * 100 / 1023 (oC /V) .
ICTS : Integrated Circuit Temperature Sensor

Temperature sensor Circuit
Temperature Sensor (output)
@
Input voltage 5v
Temperature : 22 oC
Pack hardware components

Anemometer
– The basic cause of wind can be attributed to
variation in temperature.
– Starting speed 0.3 m/s.
– Electrical output 3….1042 HZ .
– Power Consumption 0.3….1.2 mA.
Anemometer (output)
Wind Speed :
2.7 m/s
WS : Wind Speed
Pack hardware components

Power supply
– The power supply for the pack needs to be
as efficient as possible .
– Since the pack is powered
from batteries, it will not require
any rectification .
Hardware components

Wireless XBee Transmitter & Receiver.
1- High Performance.
2- Low Power.
3- Advanced and
Networking Security.
4- bidirectional transmission.
5- 10 bit ADC.
Base hardware components

Power supply
– The power supply for the base
needs to be accurate enough for the
microcontroller to function properly .

LCD
– 2 X 16 character matrix .
– On-board controller .
– Backlit display .
software
Applications
Difficulties

pressure sensor is difficult to obtain.
 Fault tolerance and nature of sensors adds
complexity to hardware and software .
 wireless.
 Low output frequency of the anemometer .
Conclusion & recommendation

Hardware and software are integrated to
solve the problem.
 Parallel implementation of designed
components allows problems to surface
early in the process.less
wireless system used in the station is
professional for long distances without
data losses .
 system is ready to be used by another
students to complete building a whole
Questions?