A-Teachers-Guide-to-the-Intel-Galileo-Final

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65 | Connecting to the Outside World// Ethernet Definitions ////////////////////////////byte mac[] = {0x??, 0x??, 0x??, 0x??, 0x??, 0x??}; // put your Galileo MAC address here/////////////////////// Pin Definitions ///////////////////////const int STAT_LED = 13; // The Galileo's status LED on pin 13const int UNREAD_LED = 12; // Lights up when there are unread emails//////////////////////////////////// Email-Checking Global Variables ////////////////////////////////////const int emailUpdateRate = 10000; // Update rate in ms (10 s)long emailLastMillis = 0; // Stores our last email check timeint emailCount = 0; // Stores the last email countvoid setup(){pinMode(STAT_LED, OUTPUT);pinMode(UNREAD_LED, OUTPUT);digitalWrite(STAT_LED, LOW);digitalWrite(UNREAD_LED, LOW);Serial.begin(9600); // Serial monitor is used for debug}if (Ethernet.begin(mac) == 0) {// If Ethernet connects, turn on Stat LEDdigitalWrite(STAT_LED, HIGH);Serial.println("Connected to the Ethernet OK.");}else{ // If Ethernet connect fails, print error, inifinite loopwhile (1);}// loop() checks for the unread email count every emailUpdateRate// milliseconds. If the count has changed, update the display.void loop(){// Only check email if emailUpdateRate ms have passedif (millis() > emailLastMillis + emailUpdateRate){emailLastMillis = millis(); // update emailLastMillis// Get unread email count, and store into temporary variableint tempCount = getEmailCount();Serial.print("You have ");Serial.print(tempCount);
A TEACHER’S GUIDE TO THE INTEL® GALILEO | 66}Serial.println(" unread mail(s).");if (tempCount != emailCount) // If it's a new value, update{ // Do this to prevent blinking the same #emailCount = tempCount; // update emailCount variabledigitalWrite(UNREAD_LED, HIGH); // turn the LED on}else if (tempCount == 0){digitalWrite(UNREAD_LED, LOW);}}// Bit of protection in case millis overruns:if (millis() < emailLastMillis)emailLastMillis = 0;// getEmailCount runs the unReadEmailChecker.py script, and reads the output.// It'll return the value printed by the unReadEmailChecker.py script.int getEmailCount(){int digits = 0;int temp[10];int emailCnt = 0;// Send a system call to run our python script and route the// output of the script to a file.system("python /home/root/decUnReadEmailChecker.py > /dev/ttyGS0");char line[100];FILE* emailsFile = fopen("/home/root/emails", "r");if (emailsFile) {// read from emails until we hit the end or a newlinewhile (fgets(line, 100, emailsFile) != NULL) {;}fclose(emailsFile);}else {Serial.println("No emails file created");}temp[digits++] = atoi(line); // convert string to an integersystem("rm emails"); // remove the file// Turn the individual digits into a single integer:for (int i=0; i
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3 | IntroductionHow to use this gui
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9 | Pedagogical ApproachesAs a proc
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11 | Setting Up Your Intel® Galile
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13 | Setting Up Your Intel® Galile
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Page 24 and 25: 19 | Beginning with ArduinoCoding I
Page 26 and 27: 21 | Beginning with ArduinoIn this
Page 28 and 29: 23 | Beginning with Arduino4. From
Page 30 and 31: 25 | Beginning with Arduino3. From
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