Hi everyone. I am having this issue whereby my led at digital pin 11 isn't turning off once a condition is set. Kindly refer my code below:
#include <SoftwareSerial.h>
#include <SD.h>
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 rtc;
const int chipSelect = 10;
int tempLED = 8;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
SoftwareSerial HC12(2, 3);
int sdled = 11;
void setup() {
Serial.begin(9600); // Serial port to computer
HC12.begin(9600); // Serial port to HC12
pinMode (tempLED,INPUT);
pinMode(sdled,OUTPUT);
Serial.println("Ready to transmit data wirelessly...");
while (!Serial);
if (!rtc.begin()) {
Serial.println("Couldn't find RTC");
while (1);
}
if (! rtc.isrunning()) {
Serial.println("RTC is NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
// rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
// This line sets the RTC with an explicit date & time, for example to set
// January 21, 2014 at 3am you would call:
// rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
}
void loop() {
DateTime now = rtc.now();
boolean sensor = digitalRead(tempLED);
File dataFile = SD.open("datalog.txt", FILE_WRITE);
if (dataFile) {
digitalWrite (sdled, LOW);
dataFile.print(now.day(), DEC);
dataFile.print('/');
dataFile.print(now.month(), DEC);
dataFile.print('/');
dataFile.print(now.year(), DEC);
dataFile.print(",");
dataFile.print(daysOfTheWeek[now.dayOfTheWeek()]);
dataFile.print(",");
dataFile.print(now.hour(), DEC);
dataFile.print(':');
dataFile.print(now.minute(), DEC);
dataFile.print(':');
dataFile.print(now.second(), DEC);
dataFile.print(",");
dataFile.print(sensor);
dataFile.println();
dataFile.close();
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
digitalWrite(sdled, LOW); //NOT WORKING
}
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print('/');
Serial.print(now.year(), DEC);
Serial.print(",");
Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
Serial.print(",");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.print(",");
Serial.print(sensor);
Serial.println();
HC12.print("DATA,");
HC12.print(now.day(), DEC);
HC12.print('/');
HC12.print(now.month(), DEC);
HC12.print('/');
HC12.print(now.year(), DEC);
HC12.print(",");
HC12.print(daysOfTheWeek[now.dayOfTheWeek()]);
HC12.print(",");
HC12.print(now.hour(), DEC);
HC12.print(':');
HC12.print(now.minute(), DEC);
HC12.print(':');
HC12.print(now.second(), DEC);
HC12.print(",");
HC12.print(sensor);
HC12.println();
// if (sensor == 1){
// HC12.println("BEEP");
// }
delay(1000);
}
But if I run the normal blink test it works fine. Really baffles me why this simple LED off/on does not work with these rows of codes 
