Arduino kódy

A serial Bluetooth module is used to create a connection with an Android app (created with MIT AppInventor).
Arduino listens for commands to light some leds or show its status. In addition, a timer interrupt makes it check for temperature via a T36 sensor:
if temperature is greater than a threshold a led is lit; every n seconds (where n is a parameter set through the app) a status report is sent to the app.
A simple command structure enables the app to send parameters and values to Arduino and the other way round.

The circuit:
* Yellow led on Pin 3 with 220 Ohm resistor in series
* Green led on Pin 4 with 220 Ohm resistor in series
* Red led on Pin 5 with 220 Ohm resistor in series
* T36 connected to 5V, Pin A0 and Gnd
* JY-MCU Bluetooth Wireless Serial Port Module (slave) connected as follows:
VCC <--> 5V
GND <--> GND
TXD <--> Pin 0 (Rx)
RXD <--> Pin 1 (Tx)
The Bluetooth module may interfere with PC to Arduino communication: disconnect VCC when programming the board
* the built-in led on Pin 13 is also used

created 2014
by Paolo Mosconi

This example code is in the public domain.
*/

// Serial Parameters: COM11 9600 8 N 1
// \r or \n to end command line
// Bluetooth is on Pin 0 & 1 @ 9600 speed

// Command structure
// CMD RED|GREEN|YELLOW=ON|OFF
// CMD TMAX|SECONDS=value
// CMD SECONDS=value
// CMD STATUS

// Status message structure
// STATUS RED|GREEN|YELLOW|TMIN|TMAX|SECONDS|TEMP|THIGH=value

float maxTemp = 30.0; // switch on led when temp > maxTemp
int maxTempSensor = (int) ((maxTemp / 100 + .5) * 204.8);
float temperature = 0.0;

int maxSeconds = 10; // send status message every maxSeconds

const int ledPin = 13; // temperature led
const int tempPin = A0; // T36 temperature sensor analog input pin

const int led1Pin = 3; // Yellow
const int led2Pin = 4; // Green
const int led3Pin = 5; // Red

volatile int tempVal;
volatile int seconds = 0;
volatile boolean tempHigh = false;
volatile boolean statusReport = false;

String inputString = "";
String command = "";
String value = "";
boolean stringComplete = false;

void setup(){
//start serial connection
Serial.begin(9600);
Serial.print("Max T: ");
Serial.print(maxTemp);
Serial.print(" Sensor: ");
Serial.println(maxTempSensor);

inputString.reserve(50);
command.reserve(50);
value.reserve(50);

pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);

pinMode(led1Pin, OUTPUT);
pinMode(led2Pin, OUTPUT);
pinMode(led3Pin, OUTPUT);
digitalWrite(led1Pin, LOW);
digitalWrite(led2Pin, LOW);
digitalWrite(led3Pin, LOW);

/*
the following code is needed to initialize the timer interrupt and set it to fire every second, the slowest that Arduino can do
for detailed information see: http://www.instructables.com/id/Arduino-Timer-Interrupts/step1/Prescalers-and-the-Compare-Match-Register/
*/
cli(); // disable global interrupts

// initialize Timer1 for interrupt @ 1000 msec
TCCR1A = 0; // set entire TCCR1A register to 0
TCCR1B = 0; // same for TCCR1B

// set compare match register to desired timer count:
OCR1A = 15624;
// turn on CTC mode:
TCCR1B |= (1 << WGM12); // Set CS10 and CS12 bits for 1024 prescaler: TCCR1B |= (1 << CS10); TCCR1B |= (1 << CS12); // enable timer compare interrupt: TIMSK1 |= (1 << OCIE1A); sei(); // enable global interrupts } // timer interrupt routine ISR(TIMER1_COMPA_vect) { tempVal = analogRead(tempPin); if (tempVal > maxTempSensor) {
digitalWrite(ledPin, HIGH);
tempHigh = true;
}
else {
digitalWrite(ledPin, LOW);
tempHigh = false;
}

if (seconds++ >= maxSeconds) {
statusReport = true;
seconds = 0;
}
}

// interpret and execute command when received
// then report status if flag raised by timer interrupt
void loop(){
int intValue = 0;

if (stringComplete) {
Serial.println(inputString);
boolean stringOK = false;
if (inputString.startsWith("CMD ")) {
inputString = inputString.substring(4);
int pos = inputString.indexOf('=');
if (pos > -1) {
command = inputString.substring(0, pos);
value = inputString.substring(pos+1, inputString.length()-1); // extract command up to \n exluded
//Serial.println(command);
//Serial.println(value);
if (command.equals("RED")) { // RED=ON|OFF
value.equals("ON") ? digitalWrite(led3Pin, HIGH) : digitalWrite(led3Pin, LOW);
stringOK = true;
}
else if (command.equals("GREEN")) { // GREEN=ON|OFF
value.equals("ON") ? digitalWrite(led2Pin, HIGH) : digitalWrite(led2Pin, LOW);
stringOK = true;
}
else if (command.equals("YELLOW")) { // YELLOW=ON|OFF
value.equals("ON") ? digitalWrite(led1Pin, HIGH) : digitalWrite(led1Pin, LOW);
stringOK = true;
}
else if (command.equals("TMAX")) { // TMAX=value
intValue = value.toInt();
if (intValue > 0) {
maxTemp = (float) intValue;
maxTempSensor = (int) ((maxTemp / 100 + .5) * 204.8);
stringOK = true;
}
}
else if (command.equals("SECONDS")) { // SECONDS=value
intValue = value.toInt();
if (intValue > 0) {
maxSeconds = intValue;
stringOK = true;
}
}
} // pos > -1
else if (inputString.startsWith("STATUS")) {
Serial.print("STATUS RED=");
Serial.println(digitalRead(led3Pin));
Serial.print("STATUS GREEN=");
Serial.println(digitalRead(led2Pin));
Serial.print("STATUS YELLOW=");
Serial.println(digitalRead(led1Pin));
Serial.print("STATUS TMAX=");
Serial.println(maxTemp);
Serial.print("STATUS SECONDS=");
Serial.println(maxSeconds);
Serial.print("STATUS TEMP=");
Serial.println(temperature);
Serial.print("STATUS THIGH=");
Serial.println(tempHigh);
stringOK = true;
} // inputString.startsWith("STATUS")
} // inputString.startsWith("CMD ")
stringOK ? Serial.println("Command Executed") : Serial.println("Invalid Command");
// clear the string for next iteration
inputString = "";
stringComplete = false;
} // stringComplete

if (statusReport) {
temperature = (tempVal * 0.0048828125 - .5) * 100;
Serial.print("STATUS TEMP=");
Serial.println(temperature);
Serial.print("STATUS THIGH=");
Serial.println(tempHigh);
statusReport = false;
}

}