MATLAB.rar_Arduino matlab_SERIAL_arduino_arduino- MATLAB_matlab

#include <LiquidCrystal.h> #define commPin 7 // Connect the Communications pin on the module to pin 7 on the Arduino LiquidCrystal lcd(12, 11, 5, 4, 3, 2); void setup() { Serial.begin(9600); // set up the LCD's number of columns and rows: lcd.begin(16, 2); // Print a message to the LCD. lcd.print("Temp & Humidity"); } void loop() { uint8_t data[3]; // We will use this to store and array of the data uint8_t bitCount = 7; // As data is sent with the most significant bit first we start at the end uint8_t byteCount = 0; // Keep count of the Bytes unsigned long t = 0; // Used to time the data pulse char str[512]; // We will use this to construct a string to send to the Serial port with the readings for (int i=0; i< 4; i++) data[i] = 0; // Empty the data array // First we need to tell the module we want it to take a reading, This is done by pulling the // communications pin low for 18mS, then high for 40uS. pinMode(commPin, OUTPUT); digitalWrite(commPin, LOW); delay(18); digitalWrite(commPin, HIGH); delayMicroseconds(40); pinMode(commPin, INPUT); // When the module is ready to send its data it will pull the communications pin low then high while(digitalRead(commPin) == LOW) delayMicroseconds(10); while(digitalRead(commPin) == HIGH) // The module will now start sending 40 bits of data, the first Byte is the Humidity, the second is just null, // the third is the Temperature, the fourth is null and the 5th is a check sum // For simplicity we will just look at the first 3 Bytes. for (int i=0; i<24; i++) { while(digitalRead(commPin) == LOW) // Wait for the High pulse to start t = micros(); // Use variable t to store the time when the high pulse starts. while(digitalRead(commPin) == HIGH) // Wait for the High pulse to end // if we now do micros() -t we know how long the High pulse lasted, around 28uS represents a '0' and // around 70uS represents a '1'. To allow some error in timing we can simply say that if the High Pulse // is longer than 49uS then it is a '1' and if it is shorter then it is a '0' if ((micros() - t) > 49) data[byteCount] |= (1 << bitCount); if (bitCount == 0) // If the bitCount has reached 0 then we are on to the net Byte { bitCount = 7; // Reset the bitCount to the MSB byteCount++; // On to the next Byte } else bitCount--; // bitCount not yet 0 so subtract 1 } int humidity = data[0]/3.75; int temperature = data[2]; sprintf(str, "%d \t %d", humidity, temperature); // Construct a string out of all three readings Serial.println(str); // Print it to the serial link delay(2000); // This is not a quick sensor so give it time to rest :) // set the cursor to column 0, line 1 // (note: line 1 is the second row, since counting begins with 0): lcd.setCursor(0, 1); // print the number of seconds since reset: lcd.print(temperature); lcd.print("oC "); lcd.print(humidity); lcd.print("% "); }