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How to use a breakout module to make interfacing with non-standard connectors easier How a resistive touch screen works The correct power and voltage measurement cycle to obtain the X & Y coordinates The meaning of high impedance That touch screens can be overlaid onto graphic displays to create interactive buttons How to define a button area using coordinates and logical AND operators How touch screen areas can be zoned into buttons or sliders

The code added in this exercise is very simple and hardly merits much discussion. Still, you may want to modify the text displayed on OrderPlaced.aspx to include additional information that customers might require after placing an order. Also, note that this new page is secured via SSL and the Customer role. Customers who aren t logged in won t need to see this page. After you ve implemented more of the new ordering code, you ll be able to provide more information to customers, such as sending them confirmation emails and enabling them to check on order statuses, past and present. For now, however, this is as far as we can take things.

@Override public boolean onCreate() { db=(new DatabaseHelper(getContext())).getWritableDatabase(); return (db == null) false : true; }

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The two projects in this chapter will demonstrate how to hook up analog and digital temperature sensors to an Arduino and how to get readings from them. Temperature sensors are used a lot in Arduino projects, from weather stations to brewing beer to high altitude balloon projects. You are going to take a look at two sensors, the analog LM335 sensor and the digital DS18B20.

After orders have been placed, you ll need to access them. This involves various modifications to the database business tier to provide new data structures and access code. Although essential in the next chapter and beyond, for now, you ll implement a simple (admin only) test form to access customer order data.

While that doesn t seem all that special, the magic is in the private DatabaseHelper object, described in 22.

You only need to make one modification here: Add a stored procedure to get access to the new information in the modified Orders table. Add the following stored procedure to the BalloonShop database: CREATE PROCEDURE CommerceLibOrderGetInfo (@OrderID int) AS SELECT OrderID, DateCreated, DateShipped, Comments, Status, CustomerID, AuthCode,

This project uses the LM335 analog temperature sensor. This sensor is part of the LM135 range of sensors from National Semiconductors. It has a range from -40 C to +100 C (-40 F to +212 F) and so is ideal for using in a weather station, for example.

Reference FROM Orders WHERE OrderID = @OrderID This is very similar to the existing OrderGetInfo stored procedure, but rewritten to take into account the new columns.

query()

The circuit and code is designed for an LM335 sensor, but you can just as easily substitute an LM135 or LM235 if you wish. You will need to adjust your code accordingly to the relevant sensor. The 5K ohm trim pot can be substituted with a standard rotary potentiometer of a similar value. Any value trimmer or potentiometer with a value between 5K ohm and 10K ohm will do.

The current order access code stored in App_Code/OrdersAccess.cs and the data for an order can be wrapped in a struct called OrderInfo. This struct is then used by various methods to manipulate order details. The OrderInfo struct doesn t give you access to the new data stored in the Orders table, and it doesn t allow you to access order details or customer and credit card information. In short, you need something a little more advanced. To achieve this, add a new class called CommerceLibAccess to the App_Code directory. You ll actually store two other classes in the same file, as per code in previous chapters (excepting the fact that in previous chapters only structs have shared files with a main class). Having a single file makes it easy to group classes that are functionally linked. All the classes in this file will facilitate data access, and you ll start by looking with a class to wrap rows in the OrderDetail table. Before doing this, however, add the following namespace references to the CommerceLibAccess.cs file: using using using using using System.Data.Common; System.Text; System.Collections.Generic; System.Web.Profile; SecurityLib;

A trim pot, or trimmer potentiometer, is simply a small potentiometer designed to adjust, or trim, part of a circuit and then, once calibrated, be left alone.

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