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void setLED(char* data) { if ((data[0] == 'r') || (data[0] == 'R')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(RedPin, Ans); Serial.print("Red is set to: "); Serial.println(Ans); } if ((data[0] == 'g') || (data[0] == 'G')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(GreenPin, Ans); Serial.print("Green is set to: "); Serial.println(Ans); } if ((data[0] == 'b') || (data[0] == 'B')) { int Ans = strtol(data+1, NULL, 10); Ans = constrain(Ans,0,255); analogWrite(BluePin, Ans); Serial.print("Blue is set to: "); Serial.println(Ans); } } Once you ve verified the code, upload it to your Arduino. Note when you upload the program nothing seems to happen. This is because the program is waiting for your input. Start the Serial Monitor by clicking its icon in the Arduino IDE taskbar. In the Serial Monitor text window, you ll enter the R, G, and B values for each of the three LEDs manually. The LEDs will change to the color you have input. If you enter R255, the Red LED will display at full brightness. If you enter R255, G255, both the red and green LEDs will display at full brightness. Now enter R127, G100, B255. You get a nice purplish color. Typing r0, g0, b0 will turn off all of the LEDs. The input text is designed to accept a lowercase or uppercase R, G, and B and then a value from 0 to 255. Any value over 255 will be dropped down to 255 by default. You can enter a comma or a space between parameters and you can enter one, two, or three LED values at any once; for example:

successful or failed if something happens, we just ignore the error. You ve learned various error-handling techniques in this and previous chapters, and you can choose to implement whichever technique you think is best for your application.

The return value is a Cursor, which contains methods for iterating over results (discussed in the Using Cursors section a little later in the chapter). If your queries are pretty much baked into your application, this is a very straightforward way to use them. However, it gets complicated if parts of the query are dynamic, beyond what positional parameters can really handle. For example, if the set of columns you need to retrieve is not known at compile time, puttering around concatenating column names into a comma-delimited list can be annoying, which is where query() comes in.

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This project introduces a several new concepts, including serial communication, pointers, and string manipulation. Hold on to your hat; this will take a lot of explaining. First, you set up an array of char (characters) to hold your text string that is 18 characters long, which is longer than the maximum of 16 allowed to ensure that you don t get buffer overflow errors. char buffer[18]; You then set up the integers to hold the red, green, and blue values as well as the values for the digital pins: int red, green, blue; int RedPin = 11; int GreenPin = 10; int BluePin = 9; In your setup function, you set the three digital pins to be outputs. But, before that, you have the Serial.begin command: void setup() { Serial.begin(9600); Serial.flush(); pinMode(RedPin, OUTPUT); pinMode(GreenPin, OUTPUT); pinMode(BluePin, OUTPUT); } Serial.begin tells the Arduino to start serial communications; the number within the parenthesis (in this case, 9600) sets the baud rate (symbols or pulses per second) at which the serial line will communicate. The Serial.flush command will flush out any characters that happen to be in the serial line so that it is empty and ready for input/output. The serial communications line is simply a way for the Arduino to communicate with the outside world, which, in this case, is to and from the PC and the Arduino IDE s Serial Monitor. In the main loop, you have an if statement if (Serial.available() > 0) {

7. Do the same for the last three buttons: // mark order as verified protected void markVerifiedButton_Click(object sender, EventArgs e) { // obtain the order ID from the session string orderId = Session["AdminOrderID"].ToString(); // mark order as verified OrdersAccess.MarkVerified(orderId); // update the form PopulateControls(); }

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