have an issue where i can not get pin 8 or 12 to switch a led (in turn a relay) on for testing

have tried to change/swap other pins and it worked so why will pin 8 or 12 work?

please help

/*still Control Trial 
 the object is to monitor temp at three points and to have set points that switchs on water pump (cooling Water) 
 and the then turn on a fan to the keep the cooling water at a even level*/

#include <OneWire.h> //This temperature sensor requires a 4.7k Ohm resistor 
#include <DallasTemperature.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>  // F Malpartida's NewLiquidCrystal library

#define I2C_ADDR    0x27  // Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN     3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7

int n = 1;

LiquidCrystal_I2C   lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

float currentTemp = 0;
int LEDone = 4;            // indicator for Pump On
int SSRwaterpumpPin = 5;  // Turn on water pump
//int SSRHeaterPin = 6;   // Turn on heat (electric or gas)
int SSRraditatorFan = 7;  // To turn on and off the air radiator fan
int LEDtwo = 8;           // indicator for Fan On

//This temperature sensor requires a 4.7k Ohm resistor 
// Data wire is plugged into pin 3 on the Arduino
#define ONE_WIRE_BUS 3

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

DeviceAddress boilermid =    {
  0x28, 0xFF, 0xC8, 0x58, 0x2D, 0x04, 0x00, 0x2F };
DeviceAddress boilerbottom = {
  0x28, 0xFF, 0x99, 0x1B, 0x44, 0x04, 0x00, 0x34 };
DeviceAddress cooling =      {
  0x28, 0xFF, 0x2F, 0x20, 0x44, 0x04, 0x00, 0x3B };

void setup(void)

  lcd.begin (20,4);

  // Switch on the backlight
  lcd.home ();                   // go home

    //lcd.clear();              // clear LCD
  lcd.setCursor(0,0);        // set cursor to column 1, row 1
  //        012345678901234567890
  lcd.print(" CAVEMAN DISTILLERY");    //SPLASH
  lcd.setCursor(0,1);          //SCREEN
  //        012345678901234567890
  delay(5000);          // delay for dramatic effect!

  lcd.clear();          // clear lcd

  // Start up the library
  // set the resolution to 12 bit (fast?)
  sensors.setResolution(boilermid, 12);
  sensors.setResolution(boilerbottom, 12);
  sensors.setResolution(cooling, 12);

  //pinMode(SSRHeaterPin, OUTPUT);
  //digitalWrite(SSRHeaterPin, LOW);
  pinMode(SSRraditatorFan, OUTPUT); //set raditator fan pin as output
  digitalWrite(SSRraditatorFan, LOW);
  pinMode(SSRwaterpumpPin, OUTPUT);
  digitalWrite(SSRwaterpumpPin, LOW);
  pinMode(LEDone, OUTPUT);
  digitalWrite(LEDone, LOW);
  pinMode(LEDtwo, OUTPUT);
  digitalWrite(LEDtwo, LOW);

void printTemperature(DeviceAddress deviceAddress)

  sensors.requestTemperatures();  // was in loop

  float tempC = sensors.getTempC(deviceAddress);
  if (tempC == -127.00) {
  else {
    // lcd.print(tempC);
    // lcd.print("/");
    currentTemp = (DallasTemperature::toFahrenheit(tempC));


void loop(void)


  float boilermid = sensors.getTempCByIndex(0);
  lcd.setCursor(0, 0);
  lcd.print("Boiler Middle:");
  lcd.print((char)223);          // print degree symbol

  float boilerbottom = sensors.getTempCByIndex(1);
  lcd.setCursor(0, 1);
  lcd.print("Boiler Bottom:");
  lcd.print((char)223);          // print degree symbol 

  float cooling = sensors.getTempCByIndex(2);
  lcd.setCursor(0, 2);
  lcd.print("Cooling Water:");
  lcd.print((char)223);          // print degree symbol

  //Cooling Mode

  if (boilerbottom >=30)
    //digitalWrite(SSRHeaterPin, LOW);
    digitalWrite(SSRwaterpumpPin, HIGH);//pin 5
    digitalWrite(LEDone, HIGH); //Pump led pin 4
  else if (boilerbottom <=29)
    //digitalWrite(SSRHeaterPin, LOW);
    digitalWrite(SSRwaterpumpPin, LOW);//pin 5
    digitalWrite(LEDone, LOW); //Pump led pin 4
  if  (cooling >=25)
     //digitalWrite(SSRHeaterPin, LOW);
    digitalWrite(SSRraditatorFan, HIGH);//pin 7
    digitalWrite(LEDtwo, HIGH);//Fan led pin 8

   else if  (cooling <=24)
    //digitalWrite(SSRHeaterPin, LOW);
    digitalWrite(SSRraditatorFan, LOW);//pin 7
    digitalWrite(LEDtwo, LOW);//Fan led pin 8




cheers all

worked it our

those collen things {{{ }}}

forgot one set on last entry :roll_eyes:

You might edit the subject in the opening post and add "solved"....

@JimboZA suggested that you add the word solved but you have deleted the title and replaced it with solved.

This is not helpful to others who may benefit from your experience.

Can you edit your title to include the orginal text as well as the word "solved".


This thread has been made useless by being edited. Because of the change of title we don't know what the problem was or the solution for that matter.

those collen things

What would one of them be ?