Using OneWire.h with two temp sensors

Projects Programming
1

When using the above Im thinking you have to find the address of each sensor using a sketch to search for them. I had a sketch that was working and now it does not. Can someone take a look at this sketch and tell me where those temp address might be. Thanks

#include <LiquidCrystal.h>

//I2C bus support
#include <Wire.h>
//I2C
#include <LiquidCrystal_I2C.h>
//OneWire bus suport
#include <OneWire.h>
//DS18B20 temperature sensor support
#include <DallasTemperature.h>
//DS18B20 sensor pin
#define ONE_WIRE_BUS 8

// Setup a oneWire instance to communicate with any OneWire devices
// (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

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

LiquidCrystal_I2C lcd(0x27, 16, 2);  // set the LCD address for the LCD display

#define MOTION_SENSOR_READ_PIN 3   // can be only 2
#define MOTION_SENSOR_DEFAULT 0 // set to 0 if by default your sensor returns LOW and to 1 if it returns HIGH (with pullup)

#define SWITCH_READ_PIN 2   // can be only 3 for you
#define SWITCH_DEFAULT 0  // set to 0 if by default your sensor returns LOW and to 1 if it returns HIGH (with pullup)

#define AWAKE_INTERWAL 12000 // in milliseconds

#define DECIMALS_OF_TEMPERATURE 2

#define OUTPUT_VOLTAGE 3.3 // in volts
#define OUTPUT_PIN 4

#define ADDICTION_FIRST_TEMP -.5  // it can be less then 0 if you want to substract the value
#define ADDICTION_SECOND_TEMP 0  // it can be less then 0 if you want to substract the value


bool wokeup = true;   // helper
long int wakeup_start_time = -1;  // helper

bool isCelsius = false;

void setup()
{
  lcd.init();
  //  lcd.backlight(); //Turns backlight on
  //  sensors.begin();
  pinMode(MOTION_SENSOR_READ_PIN, INPUT);
  pinMode(SWITCH_READ_PIN, INPUT_PULLUP);
  pinMode(OUTPUT_PIN, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(MOTION_SENSOR_READ_PIN), onMovementDetected, MOTION_SENSOR_DEFAULT == 1 ? FALLING : RISING);
  //  attachInterrupt(digitalPinToInterrupt(SWITCH_READ_PIN), onSwitchPressed, SWITCH_DEFAULT == 1 ? FALLING : RISING);
  Serial.begin(9600);
  sleep();
}

void onMovementDetected() {
  wokeup = false;
  wakeup_start_time = millis();
  wakeup();
}

int prev_state = 0;
void updateSwitch() {
  if (digitalRead(SWITCH_READ_PIN) < prev_state) {
    isCelsius = !isCelsius;
  }
  prev_state = digitalRead(SWITCH_READ_PIN);
}

void updateTimer() {
  delay(100);
  if (millis() - wakeup_start_time >= AWAKE_INTERWAL) {
    sleep();
    wakeup_start_time = -1;
    wokeup = true;
  }
}

void sleep() {
  analogWrite(OUTPUT_PIN, 0);
  lcd.clear();
  //  lcd.noBacklight();
  Serial.println("Backlight off");
}

void wakeup() {
  analogWrite(OUTPUT_PIN, int(map(OUTPUT_VOLTAGE, 0, 5, 0, 255)));
  //  lcd.backlight();
  Serial.println("Backlight on");
}

float celToFar(float temp) {
  float p = pow(10, DECIMALS_OF_TEMPERATURE);
  return round(((temp * 1.8) + 32) * p) / p;
}

void showFirstSensor() {
  float temp = sensors.getTempCByIndex(0) + ADDICTION_FIRST_TEMP;
  String smb = "*C";
  if (!isCelsius) {
    temp = celToFar(temp);
    smb = "*F";
  }
  lcd.setCursor (0, 0 );
  lcd.print("OutsideTemp:");
  lcd.print(temp);
  Serial.print("Outside Temp: " + (String)temp + smb);
}

void showSecondSensor() {
  float temp = sensors.getTempCByIndex(1) + ADDICTION_SECOND_TEMP;
  String smb = "*C";
  if (!isCelsius) {
    temp = celToFar(temp);
    smb = "*F";
  }
  lcd.setCursor (0, 1 );
  lcd.print("Pool Temp  :");
  lcd.print(temp);
  Serial.println("\tPool Temp: " + (String)temp + smb);
}

void loop() {
  updateSwitch();
  if (!wokeup) {
    lcd.backlight();
    sensors.requestTemperatures();
    showFirstSensor();
    showSecondSensor();
    updateTimer();
  } else {
    lcd.noBacklight();
  }
}
2

You are accessing by index:

3

The following code (untested) could be used if you want to use temperature sensor address explicitly:

#include<Onewire.h>
Onewire ds(7);     //DPin-7 is the signal pin

byte addTs1[8];  //to hold address/ROMCode
byte addTs2[8];

byte dataTs1[9]; //o hold 9-byte scratchpad data
byte dataTs2[9];

//---- acquire address/ROMCode-----
ds.reset();
ds.search(addTs1);     //addTS1 holds he 8-byte address/ROMCode of sensor1
ds.search(addTs2);

//-----start conversion for sensor1-----
ds.reset();
ds.sele(addTs1);
ds.wrie(0x44);   //conversion command
delay(750);       //max conversio delay

//-----read signal from ssenor1------
ds.reset();
ds.select(addTs1);
ds.write(0xBE);  //read command
ds.read_bytes(dataTs1);       //first 2-byte are temperature signal

//-----display sensor1 temperature-------
float tempTs1C = (dataTs1[1] << 8 | dataTs1[0])/16.0;
Serial.println(tempTs1C, 2);    //show temp in deg C; 2-digit after decimal point
4

With only two sensors sensors.getTempCByIndex() is the easy way.
No need to worry about addresses.

Flashing of the display can be avoided by printing static text like "OutsideTemp" and "*F" in setup(). Then overwrite the temperature at the correct cursor position.
Leo..

5

Thanks guys