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Project journal


components to order :
1. Precision Temperature Sensor
Product Description:
Temperature sensor with a range of -30C to +80C with a typical error of 0.75C in the 0C to 80C range.
The temperature sensor component is rated at -50C to +150C, but the other components on the board, the connector and the cable are rated at -30C to +80C. In a fast prototyping environment the temperature sensor board can be pushed to the ratings of the sensor component, but you should use the lower temperature ratings if you plan to use the 1124 in a commercial application.
If you need to measure temperatures outside the -30 to +80C range, you should use a 1048 or a 1051 with the appropriate temperature probe.

Product Features:
* Measures ambient temperatures from -30C to +80C
* Typical error: 0.5C
* The sensor is Ratiometric.
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2. PhidgetInterfaceKit 2/2/2
Product Description:
Designed for customers who only need a couple of Analog Inputs, Digital Inputs or Digital Outputs, the dongle size PhidgetInterfaceKit 2/2/2 is ideal for projects where space is critical.
To keep the board small, we have removed the connectors from the board and brought them out through a 12-Wire cable.

Analog Inputs

The Analog Inputs are used to measure continuous quantities, such as temperature, humidity, position, pressure, etc. Phidgets offers a wide variety of sensors that can be plugged directly into the 1011's female cable connector using the cable included with the sensor.
Sampling rates can be set at 1ms, 2ms, 4ms, 8ms and multiple of 8ms up to 1000ms.

Digital Inputs

The Digital Inputs have a Digital Input Hardware Filter to eliminate false triggering from electrical noise. They can be used to convey the state of devices such as push buttons, limit switches, relays, and logic levels.

Digital Outputs

The Digital Outputs can be used to drive LEDs, solid state relays (such as the 3052 SSR Relay Board), transistors; in fact, anything that will accept a CMOS signal.

Product Features:
* Dongle Size
* 2 Analog Inputs with configurable data acquisition rates
* 2 Digital Inputs with hardware noise filtering
* 2 Digital Outputs
* Plugs directly into a computer's USB Port
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The programming language i am planing to use to control that Phidget Interface component is Visual Basic.

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I started a little bit late, because of the change that happened in my project definition, I am much more comfortable now and I started working even in the break to make up the time that I lost. I am not very late or in trouble actually I am doing just fine. I think as long as I am doing some progress I am fine.

I have been studying how exactly the irrigation is used and what the factors that may effect on it are? What I exactly need is to understand and study the simple systems then the smart systems that are already exist out there, I need to know how it works and try to do similar technique. Understanding them is very necessary and important to me since I am not an expert in this field.
My plan wasnt only about reading some books and doing researches; if I want to understand something and learn it then I should learn it from the people who work in this field and have a good knowledge about what I need to know. It is all about asking questions. So if it is going to take some time and work to find some useful information let it take the time that it needs to build a good base of knowledge.
What the planets need to grow? This is the first question that came to my mind. Is the answer as simple as we learned when we were kids? Well, lets go in a little more details. Basically there are four main things that any planet will need to grow:
1. A place to grow
2. Air and light
3. Water
4. The right temperature

Since irrigation provides water, we can say that irrigation helps take care of one of these needs. The basic concept of irrigation is simple; there are many fascinating and remarkable systems in use today.
A place to grow:
Plants can grow in different places, in plain old dirt and in richly fertilized soil. Hydroponics its a branch of horticulture even uses specially prepared solutions of mineral salts as a plant's growing space. We can say as long as there's somewhere to put down roots and a plentiful amount of the right nutrients, a plant will do its best to grow.
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Air and light:
Photosynthesis, its a process that the planets use to make their own food. During this process the chlorophyll-containing green parts of the plant trap light energy and use it to perform a series of chemical reactions. The process involves carbon diox-ide, and so plants also need plenty of air. We usually rely on the sun to provide light for our plants.

Water:

Without water plants will not grow, it carries important nutrients from the soil and is an important trigger for germination and the process of photosynthesis.

What is irrigation at its simplest level? It is when we use watering cans or sprinkler systems when it comes to watering plants in our yards or gardens. Irrigation systems provide water and most of us dont rely on the weather.

And while this is fine for the home gardener, when you're a farmer trying to water an entire field these methods become impractical.
Although the basin method is still popular, there are more refined methods of irrigation in use today:
Surface irrigation such as border irrigation, furrow irrigation and other forms of irrigation that
use flooding
Overhead irrigation
Trickle or drip irrigation
Sub-surface irrigation and plastic mulch

The right temperature:
The right temperature is needed for the planet to grow. The seed play a big part of that, some seeds need warmer temperature than others to germinate. And if the Mother Nature is not agreeable, we can use artificial systems to get the temperature just right.



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ptg.gif 2012-04-26 03:55 45.45 KB
int.jpg 2012-03-22 08:02 57.5 KB
temp.jpg 2012-03-22 08:02 114.36 KB