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Arduino Uno and HDC1080 humidity and temperature sensor

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

 

Connection

This was connected an Arduino Uno

 Arduino connection  Module connection
 3v3 3v3
 GND  GND
 SDA – A4  SDA
 SCL – A5  SCL

 

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

1PC 2.7 V to 5.5 V HDC1080 high precision temperature and humidity sensor humidity temperature module

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

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

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Arduino Uno and BMP280 sensor example

BMP280 is an absolute barometric pressure sensor especially designed for mobile applications. The sensor module is housed in an extremely compact package. Its small dimensions and its low power consumption allow for the implementation in battery powered devices such as mobile phones, GPS modules or watches.

As its predecessor BMP180, BMP280 is based on Bosch’s proven Piezo-resistive pressure sensor technology featuring high accuracy and linearity as well as long term stability and high EMC robustness. Numerous device operation options offer highest flexibility to optimize the device regarding power consumption, resolution and filter performance. A tested set of default settings for example use case is provided to the developer in order to make design-in as easy as possible.

Applications

– Enhancement of GPS navigation (e.g. time-tofirst-fix improvement, dead-reckoning, slope detection)

– Indoor navigation (floor detection, elevator detection)

– Outdoor navigation, leisure and sports applications

– Weather forecast

– Health care applications (e.g. spirometry)

– Vertical velocity indication (e.g. rise/sink speed)

Parameter Technical data
Operation range (full accuracy) Pressure: 300…1100 hPa
Temperature: -40…85°C
Absolute accuracy
(Temp. @ 0…+65°C)
~ ±1 hPa
Relative accuracy
p = 700…900hPa
(Temp. @ +25…+40°C)
± 0.12 hPa (typical)
equivalent to ±1 m
Average current consumption (1 Hz data refresh rate) 2.74 μA, typical
(ultra-low power mode)
Average current consumption in sleep mode 0.1 μA
Average measurement time 5.5 msec
(ultra-low power preset)
Supply voltage VDDIO 1.2 … 3.6 V
Supply voltage VDD 1.71 … 3.6 V
Resolution of data Pressure: 0.01 hPa ( < 10 cm)
Temperature: 0.01° C
Temperature coefficient offset
(+25°…+40°C @900hPa)
± 0.12 hPa (typical)
equivalent to ±1 m
Interface I²C and SPI

 

Layout

This is a layout diagram using an adafruit part, my module had clearly marked SDA and SCL connections

In this example we will connect to an Arduino

arduino and bmp280

arduino and bmp280

 

Code

This example requires https://github.com/adafruit/Adafruit_BMP280_Library and https://github.com/adafruit/Adafruit_Sensor

 

/***************************************************************************
This is a library for the BMP280 humidity, temperature & pressure sensor
 
Designed specifically to work with the Adafruit BMEP280 Breakout
----> http://www.adafruit.com/products/2651
 
These sensors use I2C or SPI to communicate, 2 or 4 pins are required
to interface.
 
Adafruit invests time and resources providing this open source code,
please support Adafruit andopen-source hardware by purchasing products
from Adafruit!
 
Written by Limor Fried & Kevin Townsend for Adafruit Industries.
BSD license, all text above must be included in any redistribution
***************************************************************************/
 
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
 
#define BMP_SCK 13
#define BMP_MISO 12
#define BMP_MOSI 11
#define BMP_CS 10
 
Adafruit_BMP280 bme; // I2C
//Adafruit_BMP280 bme(BMP_CS); // hardware SPI
//Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
 
void setup() {
Serial.begin(9600);
Serial.println(F("BMP280 test"));
 
if (!bme.begin()) {
Serial.println("Could not find a valid BMP280 sensor, check wiring!");
while (1);
}
}
 
void loop() {
Serial.print("Temperature = ");
Serial.print(bme.readTemperature());
Serial.println(" *C");
 
Serial.print("Pressure = ");
Serial.print(bme.readPressure());
Serial.println(" Pa");
 
Serial.print("Approx altitude = ");
Serial.print(bme.readAltitude(1013.25)); // this should be adjusted to your local forcase
Serial.println(" m");
 
Serial.println();
delay(2000);
}

 

 

 

Output

Temperature = 27.65 *C
Pressure = 100592.44 Pa
Approx altitude = 61.17 m

Temperature = 28.72 *C
Pressure = 100589.25 Pa
Approx altitude = 61.44 m

Temperature = 29.31 *C
Pressure = 100590.25 Pa
Approx altitude = 61.35 m

Temperature = 29.70 *C
Pressure = 100588.21 Pa
Approx altitude = 61.53 m

Temperature = 30.01 *C
Pressure = 100581.49 Pa
Approx altitude = 62.09 m

Temperature = 28.95 *C
Pressure = 100601.21 Pa
Approx altitude = 60.44 m

 

Link

https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001-18.pdf

1 piece I2C/SPI BMP280 3.3 Digital Barometric Pressure Altitude Sensor Module High Precision Atmospheric Module for Arduino

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