====== LamaPLC: HDC Texas Instruments Temperature/humidity sensors with I²C communication ======
{{ :sensor:hdc1080.png?100|HDC 1080}}
The Texas Instruments HDC1080 is a low-power, high-accuracy, factory-calibrated digital humidity and temperature sensor that communicates via an I²C interface.

**Key Features**

  * **High Accuracy:** Provides a typical relative humidity accuracy of ±2% and a typical temperature accuracy of ±0.2°C.
  * **Low Power Consumption:** Features an ultra-low 100 nA sleep mode current, making it ideal for battery-powered or IoT applications.
  * **Integrated Sensing:** Measures both relative humidity and temperature with an integrated sensor element, reducing complexity and footprint.
  * **Wide Operating Range & Voltage:**
    * **Supply Voltage:** Operates over a wide range from 2.7 V to 5.5 V.
    * **Temperature Range:** Functional from -40°C to +125°C.
    * **Humidity Range:** Measures 0% to 100% relative humidity.
  * **Factory Calibrated:** The sensors are factory-calibrated, ensuring reliable, accurate measurements without requiring user calibration.
  * **Digital Interface:** Uses the I²C protocol for easy integration with microcontrollers such as Arduino or ESP32.
  * **High Resolution:** Offers 14-bit measurement resolution for precise data acquisition.
  * **Stability:** Exhibits excellent stability, particularly in high-humidity environments, with less than 0.5% per year typical drift.
  * **On-chip Heater:** Includes a built-in heater that can be used to burn off condensation, enhancing reliability in challenging environmental conditions.


**Similar sensors**

The **SHT21**, **HTU21**, **Si7021**, **GY-21**, **GY-213V**, and **HDC1080** are very similar digital humidity and temperature sensor chips from different manufacturers (Sensirion, Measurement Specialties, and Silicon Labs, respectively), while the GY-21 is a generic breakout board that uses one of these chips. They are largely interchangeable in hardware and software for most general-purpose applications.

{{page>:tarhal}}

==== HDC1080 Modul ====
{{ :sensor:hdc1080_modul.png?150|HDC1080 Modul}}
The **HDC1080 module** (often seen as the **GY-213V-HDC1080** or **CJMCU-1080**) is a breakout board that integrates the Texas Instruments HDC1080 low-power, high-accuracy digital humidity and temperature sensor. It simplifies interfacing with microcontrollers via the I²C bus.

  * **Integrated Sensing:** The module measures both relative humidity (0-100%) and temperature (-40°C to +125°C) on a single chip.
  * **High Accuracy:** It delivers high-precision measurements with a typical accuracy of ±2% RH and ±0.2°C.
  * **Wide Operating Voltage:** The board typically supports a 2.7V to 5.5V DC supply range, making it compatible with both 3.3V and 5V systems such as Arduino and Raspberry Pi.
  * **Ultra-Low Power:** It features a very low 100 nA sleep mode current, suitable for battery-operated devices.
  * **I²C Interface:** Communication is handled via the standard I²C (IIC) protocol, using only SDA and SCL, simplifying wiring to a microcontroller.

==== Arduino & HDC1080 Modul ====
  * SCL: A5
  * GND: GND
  * SDA: A4
  * Vdd: 5V
**Arduino code**

To interface the HDC1080 module with an Arduino, the most popular and feature-rich option is the **ClosedCube HDC1080** library.

This sketch initializes the sensor and prints temperature and humidity readings to the Serial Monitor every 3 seconds.
<code c>
#include <Wire.h>
#include "ClosedCube_HDC1080.h"

ClosedCube_HDC1080 hdc1080;

void setup() {
  Serial.begin(9600);
  
  // Standard I2C address for HDC1080 is 0x40
  hdc1080.begin(0x40); 
  
  Serial.print("Manufacturer ID: 0x");
  Serial.println(hdc1080.readManufacturerId(), HEX); // Should be 0x5449
}

void loop() {
  // Read temperature and humidity
  float temp = hdc1080.readTemperature();
  float humidity = hdc1080.readHumidity();
  
  Serial.print("T=");
  Serial.print(temp);
  Serial.print("C, RH=");
  Serial.print(humidity);
  Serial.println("%");
  
  delay(3000); // Wait for 3 seconds
}
</code>

===== I²C topics on lamaPLC =====
{{topic>i2c}}

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{{tag>SHT21 HTU21 Si7021 GY-21 GY-213V HDC1080 GY-213V-HDC1080 CJMCU CJMCU-1080 Texas_Instruments temperature humidity sensor i2c communication arduino code}}

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