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ESP32 ArduinoCore Interface – OW (DS18B20)

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#include <OneWire.h>
#include <DallasTemperature.h>
 
// Data wire is plugged into GPIO 15 on the ESP32
#define ONE_WIRE_BUS 22
#define TEMPERATURE_PRECISION 12 // Lower resolution
 
// 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);
 
int numberOfDevices; // Number of temperature devices found
 
DeviceAddress tempDeviceAddress; // We'll use this variable to store a found device address
 
void setup(void)
{
  // start serial port
  Serial.begin(115200);
  Serial.println("Dallas Temperature IC Control Library Demo");
 
  // Start up the library
  sensors.begin();
  
  // Grab a count of devices on the wire
  numberOfDevices = sensors.getDeviceCount();
  
  // locate devices on the bus
  Serial.print("Locating devices...");
  
  Serial.print("Found ");
  Serial.print(numberOfDevices, DEC);
  Serial.println(" devices.");
 
  // report parasite power requirements
  Serial.print("Parasite power is: ");
  if (sensors.isParasitePowerMode()) Serial.println("ON");
  else Serial.println("OFF");
  
  // Loop through each device, print out address
  for(int i=0;i<numberOfDevices; i++)
  {
    // Search the wire for address
    if(sensors.getAddress(tempDeviceAddress, i))
  {
    Serial.print("Found device ");
    Serial.print(i, DEC);
    Serial.print(" with address: ");
    printAddress(tempDeviceAddress);
    Serial.println();
    
    Serial.print("Setting resolution to ");
    Serial.println(TEMPERATURE_PRECISION, DEC);
    
    // set the resolution to TEMPERATURE_PRECISION bit (Each Dallas/Maxim device is capable of several different resolutions)
    sensors.setResolution(tempDeviceAddress, TEMPERATURE_PRECISION);
    
     Serial.print("Resolution actually set to: ");
    Serial.print(sensors.getResolution(tempDeviceAddress), DEC);
    Serial.println();
  }else{
    Serial.print("Found ghost device at ");
    Serial.print(i, DEC);
    Serial.print(" but could not detect address. Check power and cabling");
  }
  }
  delay(5000);
}
 
// function to print the temperature for a device
void printTemperature(DeviceAddress deviceAddress)
{
  float tempC = sensors.getTempC(deviceAddress);
  Serial.print("Temp C: ");
  Serial.println(tempC);
  Serial.print("Temp F: ");
  Serial.println(DallasTemperature::toFahrenheit(tempC)); // Converts tempC to Fahrenheit
}
 
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");
  // Loop through each device, print out temperature data
  for(int i=0;i<numberOfDevices; i++)
  {
    // Search the wire for address
    if(sensors.getAddress(tempDeviceAddress, i))
  {
    // Output the device ID
    Serial.print("Temperature for device: ");
    Serial.println(i,DEC);
    // It responds almost immediately. Let's print out the data
    printTemperature(tempDeviceAddress); // Use a simple function to print out the data
    delay(3000);
  }
  //else ghost device! Check your power requirements and cabling
  }
}
 
// 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);
  }
}

 

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