// SpeedTrap by Sumner Patterson // v. 24-07-18 #include #include /**********************************************************/ char array1[]=" SpeedTrap Speedometer "; //the string to print on the LCD on startup char array2[]=" By Sumner Patterson "; //the string to print on the LCD on startup LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display // was 0x27 tried 0x3F #define rightSensorPin 27 #define leftSensorPin 26 #define reSetPin 32 unsigned long time1 = 0; unsigned long rightSensorMillis=0; unsigned long leftSensorMillis=0; unsigned long trapTime=0; unsigned long constantMph = 0; unsigned long MPH = 0; // variables will change: int previousMph = 0; int currentMph = 0; int lastMph = 000; int reSet = 0; // reads the rest button switch int rightSensorState = 0; // right sensor beam. int leftSensorState = 0; // left sensor beam. int rightSenFlag = 1; // Have it only read one time and then change value of rightSenFlag until x is reset to 1. int leftSenFlag = 1; // Have it only read one time and then change value of leftSenFlag until x is reset to 1. int showDisplayFlag = 1; // I think I'm actually not using this to do anything at the moment. int mphFlag = 0; // I think I'm actually not using this to do anything at the moment. int tim = 300; //the value of delay time long Time = 0; long debounce = 700; // Stops reading the reset button more than once....increase if that is a problem. int resetFlag = 1; // show waiting for loco void setup() { Wire.begin(18, 22); // 18 is SDA and 22 is SCL pinMode(reSetPin, INPUT_PULLUP); // initialize the reSetPin as an input pinMode(rightSensorPin, INPUT);// initialize the right sensor pin as an input: pinMode(leftSensorPin, INPUT);// initialize the left sensor pin as an input: pinMode(rightSensorPin, INPUT_PULLUP); // turn on the pullup for right sensor pinMode(leftSensorPin, INPUT_PULLUP); // turn on the pullup for left senson********* This did not work and was from Adafruit //constantMph = 57000 -- Increase to make mph higher -- Decrease to make mph lower. constantMph = 57000; // Use for Straight SpeedTrap--Comment out with '//' if you are using the 'Curved SpeedTrap' // constantMph = 55500; // Use for Curved SpeedTrap--Remove the '//' in front of constantMph = 55500 -- Comment out the line above. rightSenFlag = 1; leftSenFlag = 1; mphFlag = 1; lastMph = 000; previousMph = 000; lcd.init(); //initialize the lcd lcd.backlight(); //open the backlight Serial.begin(9600); lcd.setCursor(15,0); // set the cursor to column 15, line 0 for (int positionCounter1 = 0; positionCounter1 < 26; positionCounter1++) { lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left. lcd.print(array1[positionCounter1]); // Print a message to the LCD. delay(tim); //wait for 250 microseconds } lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner. lcd.setCursor(15,1); // set the cursor to column 15, line 1 for (int positionCounter2 = 0; positionCounter2 < 26; positionCounter2++) { lcd.scrollDisplayLeft(); //Scrolls the contents of the display one space to the left. lcd.print(array2[positionCounter2]); // Print a message to the LCD. delay(tim); //wait for 250 microseconds } lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner. delay (1000); lcd.setCursor(4,0); // set the cursor to column 4, line 0 lcd.print("SpeedTrap"); lcd.setCursor(0,1); // set the cursor to column 0, line 1 lcd.print("Waiting on Loco"); delay (1000); // lcd.clear(); } /*********************************************************/ void loop() { // ******************* read the state of the right sensor ********************************* rightSensorState = digitalRead(rightSensorPin); if (rightSenFlag == 1) { // Have it only read one time and then change value of rightSenFlag until x is reset to 1 if (rightSensorState == LOW) { // check if the sensor beam is broken. If it is, the sensorState is LOW: rightSenFlag = 2; rightSensorMillis = millis(); Serial.println(" ..................................."); Serial.println((String)" Right Sensor Triggered.........."+"rightSenFlag = "+rightSenFlag); } } // *************************** read the state of the left sensor *********************************** leftSensorState = digitalRead(leftSensorPin); if (leftSenFlag == 1) { // Have it only read one time and then change value of leftSenFlag until x is reset to 1) if (leftSensorState == LOW) { // check if the sensor beam is broken. If it is, the sensorState is LOW: leftSenFlag = 2; leftSensorMillis = millis(); Serial.println(" ..................................."); Serial.println((String)" Left Sensor Triggered.........."+"leftSenFlag = "+leftSenFlag); } } // ****************************Determine the MPH ******************************************* if (rightSenFlag == 2 && leftSenFlag == 2) { if (rightSensorMillis < leftSensorMillis){ trapTime = (leftSensorMillis - rightSensorMillis); } else if (rightSensorMillis > leftSensorMillis){ trapTime = (rightSensorMillis - leftSensorMillis); } MPH = constantMph / trapTime; // calculates mph. mphFlag = 2; } //************************* Reads the reset button **************************************** reSet = digitalRead(reSetPin); //Reads the button to refresh the display if (( reSet == LOW) && (millis() - Time) > debounce) { // Button == LOW && (millis() - Time) > debounce && Time = millis(); lcd.clear(); //Clears the LCD screen and positions the cursor in the upper-left corner. rightSenFlag = 1; // reset right sensor so it can turn on. leftSenFlag = 1; // reset left sensor so it can turn on. showDisplayFlag = 1; mphFlag = 1; rightSensorMillis=0; leftSensorMillis=0; lastMph = MPH; MPH = 0; resetFlag = 1; if (resetFlag = 1) { // show waiting for loco lcd.setCursor(0,1); // set the cursor to column 4, line 1 lcd.print(" "); lcd.setCursor(0,1); // set the cursor to column 4, line 1 lcd.print("Previous MPH "); int previousMphInt = lastMph; char previousMph[10]; sprintf(previousMph, "%d", previousMphInt); lcd.print(previousMph); showDisplayFlag = 0; lcd.setCursor(0,0); // set the cursor to column 4, line 1 lcd.print("Waiting on Loco"); resetFlag = 2; } } //************************ Displays Current MPH ****************************** if (rightSenFlag == 2 && leftSenFlag == 2) { lcd.setCursor(0,0); // set the cursor to column 4, line 1 lcd.print(" "); lcd.setCursor(0,0); // set the cursor to column 4, line 1 lcd.print("Current MPH "); int currentMphInt = MPH; char currentMph[10]; sprintf(currentMph, "%d", currentMphInt); lcd.print(currentMph); //********************** Displays Previous MPH ******************************* lcd.setCursor(0,1); // set the cursor to column 4, line 1 lcd.print(" "); lcd.setCursor(0,1); // set the cursor to column 4, line 1 lcd.print("Previous MPH "); int previousMphInt = lastMph; char previousMph[10]; sprintf(previousMph, "%d", previousMphInt); lcd.print(previousMph); showDisplayFlag = 0; } // ********************** End Show Display **************************************************** delay (1); }