# DS18B20 #

Arduino library for the Maxim Integrated DS18B20 1-Wire temperature sensor. This library is very simple and intuitive to use, and supports auto-discovering sensors with an optional high/low condition or manually addressing individual sensors.

For example, we can get the temperature from every sensor on the wire with just a few lines of code:

```
#include <DS18B20.h>

DS18B20 ds(2);

void setup() {
  Serial.begin(9600);
}

void loop() {
  while (ds.selectNext()) {
    Serial.println(ds.getTempC());
  }
}
```

See the included [examples](/examples/) for more.

## Installation ##

This library uses the OneWire library, so you will need to have this installed. Install it using the Library Manager in the Arduino IDE or download the latest release from [GitHub](https://github.com/PaulStoffregen/OneWire).

In the **OneWire.h** file set `ONEWIRE_SEARCH` to 0 since the search functionality is also implemented in this library (don't do this if you need the search functionality for other 1-Wire devices). CRC must be enabled (choose whichever algorithm you prefer). This may save some space on your Arduino.

## Wiring the DS18B20 ##
The resistor shown in all the circuit diagrams is 4.7k Ohm pullup resistor.

### External Power Mode ###

#### Single ####
![A single externally powered DS18B20](/extras/single_external.png)

#### Multiple ####
![Multiple externally powered DS18B20s](/extras/multiple_external.png)

### Parasitic Power Mode ###

#### Single ####
![A single parasite powered DS18B20](/extras/single_parasite.png)

#### Multiple ####
![Multiple parasite powered DS18B20s](/extras/multiple_parasite.png)

### Mixed Power Mode ###
![Mixed mode DS18B20s](/extras/mixed_mode.png)