Dallas ds18b20 with Raspberry Pi Pico (rp2040): introduction and parasite mode

#define REQUIRESNEW 

#define REQUIRESALARMS

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port D22
#define ONE_WIRE_BUS D22

// 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);

/*
 * The setup function. We only start the sensors here
 */
void setup(void)
{
  // start serial port
  Serial.begin(115200);
  while (!Serial) { delay(100); }

  Serial.println("Dallas Temperature IC Control Library Demo");

  // Start up the library
  sensors.begin();
}

/*
 * Main function, get and show the temperature
 */
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");
  // After we got the temperatures, we can print them here.
  // We use the function ByIndex, and as an example get the temperature from the first sensor only.
  float tempC = sensors.getTempCByIndex(0);

  // Check if reading was successful
  if(tempC != DEVICE_DISCONNECTED_C)
  {
    Serial.print("Temperature for the device 1 (index 0) is: ");
    Serial.println(tempC);
  }
  else
  {
    Serial.println("Error: Could not read temperature data");
  }

  delay(2000);
}

Dallas Temperature IC Control Library Demo
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.50
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.50
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.50
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.50
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.44
Requesting temperatures...DONE
Temperature for the device 1 (index 0) is: 20.44

/**
 * Retrieve information about a single sensor
 * minor change by Renzo Mischianti <www.mischianti.org>
 *
 * www.mischianti.org
 */

// Include the libraries we need
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port D22
#define ONE_WIRE_BUS D22

// 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);

// arrays to hold device address
DeviceAddress insideThermometer;

/*
 * Setup function. Here we do the basics
 */
void setup(void)
{
  // start serial port
  Serial.begin(112500);
  Serial.println("Dallas Temperature IC Control Library Demo");

  // locate devices on the bus
  Serial.print("Locating devices...");
  sensors.begin();
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  // report parasite power requirements
  Serial.print("Parasite power is: ");
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");

  // Assign address manually. The addresses below will beed to be changed
  // to valid device addresses on your bus. Device address can be retrieved
  // by using either oneWire.search(deviceAddress) or individually via
  // sensors.getAddress(deviceAddress, index)
  // Note that you will need to use your specific address here
  // insideThermometer = { 0x28, 0xFF, 0x64, 0x0E, 0x79, 0x69, 0x3A, 0x1A };
  // we can check if the address is correct and if It's all ok
  // if (!oneWire.search(insideThermometer)) Serial.println("Unable to find address for insideThermometer");

  // Search for devices on the bus and assign based on an index. Ideally,
  // you would do this to initially discover addresses on the bus and then
  // use those addresses and manually assign them (see above) once you know
  // the devices on your bus (and assuming they don't change).
  if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0");

  // show the addresses we found on the bus
  Serial.print("Device 0 Address: ");
  printAddress(insideThermometer);
  Serial.println();

  Serial.print("Device 0 HEX Address: ");
  printHEXAddress(insideThermometer);
  Serial.println();

  // set the resolution to 9 bit (Each Dallas/Maxim device is capable of several different resolutions)
  sensors.setResolution(insideThermometer, 9);

  Serial.print("Device 0 Resolution: ");
  Serial.print(sensors.getResolution(insideThermometer), DEC);
  Serial.println();
}

/*
 * Main function. It will request the tempC from the sensors and display on Serial.
 */
void loop(void)
{
  // call sensors.requestTemperatures() to issue a global temperature
  // request to all devices on the bus
  Serial.print("Requesting temperatures...");
  sensors.requestTemperatures(); // Send the command to get temperatures
  Serial.println("DONE");

  // It responds almost immediately. Let's print out the data
  printTemperature(insideThermometer); // Use a simple function to print out the data

  delay(4000);
}

// function to print a device address
void printAddress(DeviceAddress deviceAddress)
{
  for (uint8_t i = 0; i < 8; i++)
  {
    if (deviceAddress[i] < 16) Serial.print("0");
    Serial.print(deviceAddress[i], HEX);
  }
}

void printHEXAddress(DeviceAddress deviceAddress)
{
    Serial.print("  { ");
    for (uint8_t i = 0; i < 8; i++)
    {
      Serial.print("0x");
      if (deviceAddress[i] < 0x10) Serial.print("0");
      Serial.print(deviceAddress[i], HEX);
      if (i < 7) Serial.print(", ");
    }
    Serial.println(" }");
}

// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  // method 1 - slower
  //Serial.print("Temp C: ");
  //Serial.print(sensors.getTempC(deviceAddress));
  //Serial.print(" Temp F: ");
  //Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit

  // method 2 - faster
  float tempC = sensors.getTempC(deviceAddress);
  if(tempC == DEVICE_DISCONNECTED_C)
  {
    Serial.println("Error: Could not read temperature data");
    return;
  }
  Serial.print("Temp C: ");
  Serial.print(tempC);
  Serial.print(" Temp F: ");
  Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
}

Dallas Temperature IC Control Library Demo
Locating devices...Found 1 devices.
Parasite power is: OFF 
Device 0 Address: 28FF640E79693A1A
Device 0 HEX Address:   { 0x28, 0xFF, 0x64, 0x0E, 0x79, 0x69, 0x3A, 0x1A }

Device 0 Resolution: 9
Requesting temperatures...DONE
Temp C: 22.50 Temp F: 72.50
Requesting temperatures...DONE
Temp C: 22.50 Temp F: 72.50

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 22

// 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);

  // locate devices on the bus
  Serial.print("Locating devices...");
  sensors.begin();
  Serial.print("Found ");
  Serial.print(sensors.getDeviceCount(), DEC);
  Serial.println(" devices.");

  // report parasite power requirements
  Serial.print("Parasite power is: ");
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");

  // Search for devices on the bus and assign based on an index. Ideally,
  // you would do this to initially discover addresses on the bus and then
  // use those addresses and manually assign them (see above) once you know
  // the devices on your bus (and assuming they don't change).
  if (!sensors.getAddress(insideThermometer, 0)) Serial.println("Unable to find address for Device 0");

  float tempC = sensors.getTempC(deviceAddress);

  Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit

  Serial.print(sensors.getTempF(deviceAddress)); // Makes a second call to getTempC and then converts to Fahrenheit