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You first declare a variable for the potentiometer pin int potPin = 2; because your potentiometer is connected to Analog Pin 2. To read the value from an analog pin, you use the analogRead command. The Arduino has six analog input/outputs with a 10-bit analog to digital convertor (I will discuss bits later). This means the analog pin can read in voltages between 0 to 5 volts in integer values between 0 (0 volts) and 1,023 (5 volts). This gives a resolution of 5 volts / 1024 units or 0.0049 volts (4.9mV) per unit. Set your delay using the potentiometer so that you can use the direct values read in from the pin to adjust the delay between 0 and 1023 milliseconds (or just over 1 second). You do this by directly reading the value of the potentiometer pin into ledDelay. Notice that you don t need to set an analog pin to be an input or output (unlike with a digital pin): ledDelay = analogRead(potPin); This is done during your main loop and therefore it is constantly being read and adjusted. By turning the knob, you can adjust the delay value between 0 and 1023 milliseconds (or just over a second) and thus have full control over the speed of the effect. Let s find out what a potentiometer is and how it works.

Okay, enough theory, let s add some code to OrdersAdmin.aspx. First, you ll add the constituent controls to the form, and then you ll write the code-behind file. While building the user interface in the following exercise, you ll also add the validator controls. This is the first (and only) place in this book they are used, so pay special attention to them.

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The only additional piece of hardware used in this project is the 4K7 (4700 ) potentiometer. You know how resistors work. Well, the potentiometer is simply an adjustable resistor with a range from 0 to a set value (written on the side of the pot). In this project, you re using a 4K7 (4,700 ) potentiometer, which means its range is from 0 to 4700 Ohms. The potentiometer has three legs. By connecting just two legs, the potentiometer becomes a variable resistor. By connecting all three legs and applying a voltage across it, the pot becomes a voltage divider. The latter is how you going to use it in your circuit. One side is connected to ground, the other to 5v, and the center leg to your analog pin. By adjusting the knob, a voltage between 0 and 5v will be leaked from the center pin; you can read the value of that voltage on Analog Pin 2 and use it to change the delay rate of the light effect. The potentiometer can be very useful in providing a means of adjusting a value from 0 to a set amount, e.g. the volume of a radio or the brightness of a lamp. In fact, dimmer switches for your home lamps are a kind of potentiometer.

This means that the fields will be updated when the activity is opened and after the preferences activity is left (e.g., via the back button), as shown in Figure 21 3.

1. The first step is to add the necessary Label controls, Button controls, a GridView, and a PlaceHolder control to the second place holder in OrdersAdmin.aspx, as shown in Figure 10-9.

Figure 10-9. Adding controls to OrdersAdmin.ascx The code that generates these controls is <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" runat= "Server"> <span class="AdminPageText"> Show the most recent <asp:TextBox ID="recentCountTextBox" runat="server" MaxLength="4" Width= "40px" Text="20" /> records <asp:Button ID="byRecentGo" runat="server" CssClass="SmallButtonText" Text="Go" /><br /> Show all records created between <asp:TextBox ID="startDateTextBox" runat="server" Width="72px" /> and <asp:TextBox ID="endDateTextBox" runat="server" Width="72px" /> <asp:Button ID="byDateGo" runat="server" CssClass="SmallButtonText" Text="Go" /> <br /> Show all unverified, uncanceled orders <asp:Button ID="unverfiedGo" runat="server" CssClass="SmallButtonText" Text="Go" /> <br /> Show all verified, uncompleted orders <asp:Button ID="uncompletedGo" runat="server" CssClass="SmallButtonText"

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