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#include <EEPROM.h>
// these values are saved in EEPROM
const byte EEPROM_ID = 0x99; // used to identify if valid data in EEPROM
byte ledPin = 13; // the number of the LED pin
int interval = 1000; // interval at which to blink (milliseconds)
// variables that do not need to be saved
int ledState = LOW; // ledState used to set the LED
long previousMillis = 0; // will store last time LED was updated
//constants used to identify EEPROM addresses
const int ID_ADDR = 0; // the EEPROM address used to store the ID
const int PIN_ADDR = 1; // the EEPROM address used to store the pin
const int INTERVAL_ADDR = 2; // the EEPROM address used to store the interval
void setup()
{
Serial.begin(9600);
byte id = EEPROM.read(ID_ADDR); // read the first byte from the EEPROM
if( id == EEPROM_ID)
{
// here if the id value read matches the value saved when writing eeprom
Serial.println("Using data from EEPROM");
ledPin = EEPROM.read(PIN_ADDR);
byte hiByte = EEPROM.read(INTERVAL_ADDR);
byte lowByte = EEPROM.read(INTERVAL_ADDR+1);
interval = word(hiByte, lowByte); // see word function in Recipe 3.15
}
else
{
// here if the ID is not found, so write the default data
Serial.println("Writing default data to EEPROM");
EEPROM.write(ID_ADDR,EEPROM_ID); // write the ID to indicate valid data
EEPROM.write(PIN_ADDR, ledPin); // save the pin in eeprom
byte hiByte = highByte(interval);
byte loByte = lowByte(interval);
EEPROM.write(INTERVAL_ADDR, hiByte);
EEPROM.write(INTERVAL_ADDR+1, loByte);
}
Serial.print("Setting pin to ");
Serial.println(ledPin,DEC);
Serial.print("Setting interval to ");
Serial.println(interval);
pinMode(ledPin, OUTPUT);
}
void loop()
{
// this is the same code as the BlinkWithoutDelay example sketch
if (millis() - previousMillis > interval)
{
previousMillis = millis(); // save the last time you blinked the LED
// if the LED is off turn it on and vice versa:
if (ledState == LOW)
ledState = HIGH;
else
ledState = LOW;
digitalWrite(ledPin, ledState); // set LED using value of ledState
}
processSerial();
}
// function to get duration or pin values from Serial Monitor
// value followed by i is interval, p is pin number
int value = 0;
void processSerial()
{
if( Serial.available())
{
char ch = Serial.read();
if(ch >= '0' && ch <= '9') // is this an ascii digit between 0 and 9?
{
value = (value * 10) + (ch - '0'); // yes, accumulate the value
}
else if (ch == 'i') // is this the interval
{
interval = value;
Serial.print("Setting interval to ");
Serial.println(interval);
byte hiByte = highByte(interval);
byte loByte = lowByte(interval);
EEPROM.write(INTERVAL_ADDR, hiByte);
EEPROM.write(INTERVAL_ADDR+1, loByte);
value = 0; // reset to 0 ready for the next sequence of digits
}
else if (ch == 'p') // is this the pin number
{
ledPin = value;
Serial.print("Setting pin to ");
Serial.println(ledPin,DEC);
pinMode(ledPin, OUTPUT);
EEPROM.write(PIN_ADDR, ledPin); // save the pin in eeprom
value = 0; // reset to 0 ready for the next sequence of digits
}
}
}
Bác có biết code này là gì hem ,biết thì bàn tiếp ,còn không thì tui không tiếp bác nữa ...
