HDC1080

The HDC1080 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The HDC1080 operates over a wide supply range, and is a low cost, low power alternative to competitive solutions in a wide range of common applications. The humidity and temperature sensors are factory calibrated.

Features
Relative Humidity Accuracy ±2% (typical)
Temperature Accuracy ±0.2°C (typical)
Excellent Stability at High Humidity
14 Bit Measurement Resolution
100 nA Sleep Mode Current

Parts Required

Here are the parts I used

you can connect to the sensor using a standard header the classic dupont style jumper wire.

Name	Link
ESP32		Aliexpress link Amazon Ebay
HDC1080		Aliexpress link Ebay link Amazon Link
Connecting cables		Aliexpress link Amazon Ebay

Connection

This was connected a Wemos Lolin32

Code

You will need to download the following library and install it from  https://github.com/closedcube/ClosedCube_HDC1080_Arduino , this is the default example

#include <Wire.h>
#include "ClosedCube_HDC1080.h"

ClosedCube_HDC1080 hdc1080;

void setup()
{
Serial.begin(9600);
Serial.println("ClosedCube HDC1080 Arduino Test");

// Default settings:
// - Heater off
// - 14 bit Temperature and Humidity Measurement Resolutions
hdc1080.begin(0x40);

Serial.print("Manufacturer ID=0x");
Serial.println(hdc1080.readManufacturerId(), HEX); // 0x5449 ID of Texas Instruments
Serial.print("Device ID=0x");
Serial.println(hdc1080.readDeviceId(), HEX); // 0x1050 ID of the device

printSerialNumber();

}

void loop()
{
Serial.print("T=");
Serial.print(hdc1080.readTemperature());
Serial.print("C, RH=");
Serial.print(hdc1080.readHumidity());
Serial.println("%");
delay(3000);
}

void printSerialNumber() {
Serial.print("Device Serial Number=");
HDC1080_SerialNumber sernum = hdc1080.readSerialNumber();
char format[12];
sprintf(format, "%02X-%04X-%04X", sernum.serialFirst, sernum.serialMid, sernum.serialLast);
Serial.println(format);
}

Output

Open the serial monitor window and you should expect to see something like this

T=21.75C, RH=28.00%
T=21.60C, RH=28.21%
T=25.36C, RH=32.17%
T=27.87C, RH=43.27%
T=27.42C, RH=40.23%
T=26.90C, RH=32.15%
T=26.41C, RH=27.84%
T=26.00C, RH=25.77%
T=25.59C, RH=24.80%
T=25.15C, RH=24.43%
T=24.81C, RH=24.34%
T=24.45C, RH=24.47%
T=24.13C, RH=24.68%
T=23.82C, RH=24.89%
T=23.55C, RH=25.30%
T=23.26C, RH=25.72%
T=23.01C, RH=26.14%
T=22.71C, RH=26.64%
T=22.49C, RH=26.96%
T=22.28C, RH=27.27%

Links

http://www.ti.com/lit/gpn/hdc1080

http://www.ti.com/lit/pdf/snau189