Tag Archives: temperature

IDT Announces High Performance MEMS Relative Humidity & Temperature Sensor

California based company, Integrated Device Technology (IDT) has recently announced their new HS300x family of MEMS high-performance relative humidity (RH) and temperature sensors of dimension 3.0 × 2.41 × 0.8 mm DFN-style 6-pin LGA. Currently, there are four devices in this family—the HS3001, HS3002, HS3003, and HS3004. They are all the same from the view of functionality but differ slightly in terms of the accuracy of their relative humidity and temperature measurements.

Development board for ITD MEMs sensors

The highlighted feature of this new lineup is that they do not require any user calibration. HS300x family of ICs has calibration and compensation logic integrated into the devices. These ICs output their fully corrected data using standard I2C protocols making the measured data from the sensors is rather easy.

As a side note, Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. As the entire output consists of only four bytes of data, calculating the corresponding relative humidity in percent and temperature in degrees Celsius is very easy.

Although the HS300x sensors operate as slave devices on the I2C bus (supporting clock frequencies from 100 kHz to 400 kHz), only one HS300x IC can be connected directly to a single I2C bus. To connect multiple sensors to a single I2C bus, an I2C multiplexer/switch has to be used. It would have been easier if IDT had dedicated the unused pin as an optional I2C address input bit, which would allow two HS300x devices to be connected to a single I2C bus.

If you’re interested in testing these ICs prior to incorporating them into a design, SDAH01 or SDAH02 evaluation kit can come handy. Although both kits utilize the HS3001 sensor, the SDAH01 kit outputs the measured data to a PC while the SDAH02 displays the data on an LCD screen.

3 in 1 Temperature Sensor Shield For Arduino Nano

This 3 in 1  shield for Arduino Nano helps to develop various temperature measuring applications. Arduino Nano shield consists of 3 different types of temperature sensors.

  1. MLX90614 non-contact temperature sensor
  2. 10K NTC Analogue Temperature Sensor
  3. Programmable Resolution 1-Wire Digital Thermometer

With this board is easy to make a contactless temperature meter using the earlier published 4 Digit display Nano shield,

Note : Only MLX90614 sensor can be used with display shield , DS18200 and NTC has to be removed as display uses those port pins.

3 in 1 Temperature Sensor Shield For Arduino Nano – [Link]

Raspberry Pi Clock with Temperature

A Raspberry Pi clock with outside temperature display using OpenWeatherMap and inside temperature display using a MCP9808 sensor. By Jeremiah Mattison

This project is for a building a digital clock that includes temperature display. It uses OpenWeatherMap to retrieve outside temperature information and a MCP9808 sensor for inside temperature.

Raspberry Pi Clock with Temperature – [Link]

Sensirion presents CO2 and RH/T Sensor Module

At this year’s AHR Expo 2018 trade show in Chicago (January 22 – 24, 2018), Sensirion, the expert in environmental and flow sensor solutions, is introducing the SCD30 – a humidity, temperature and carbon dioxide concentration sensor.

CMOSens® Technology for IR detection enables highly accurate carbon dioxide measurement at a competitive price. Along with the NDIR measurement technology for CO2 detection, a best-in-class Sensirion humidity and temperature sensor is also integrated on the same sensor module. Ambient humidity and temperature can be outputted by Sensirion’s algorithm expertise through modeling and compensating of external heat sources without the requirement for any additional components. Thanks to the dual-channel principle for the measurement of carbon dioxide concentration, the sensor compensates for long-term drifts automatically by design. The very small module height allows easy integration into different applications.

Carbon dioxide is a key indicator of indoor air quality. Thanks to new energy standards and better insulation, houses have become increasingly energy efficient, but the air quality can deteriorate rapidly. Active ventilation is needed to maintain a comfortable and healthy indoor environment, and to improve the well-being and productivity of the inhabitants. Sensirion’s SCD30 offers accurate and stable CO2, temperature and humidity monitoring. This enables customers to develop new solutions that increase energy efficiency and simultaneously support well-being. With the new SCD30, Sensirion has expanded its portfolio to include environmental sensor for air quality measurement.

Visit Sensirion at AHR Expo 2018 (Booth 3858) and learn more about the SCD30, Sensirion’s new humidity, temperature and carbon dioxide sensor module.

Discover more about relevant environmental parameters and Sensirion’s other innovative environmental sensors at www.sensirion.com/environmental-sensing

A Temperature Logger to Protect Sea turtles

Low-cost/power/size temperature logger

Data loggers are small, battery-powered devices used to sense and store information in different situations. They include a microprocessor, data storage, one or several sensors and they can record information for a very long period. However, some data loggers do not include sensors, but have ports that allow a sensor to be connected. They are used indoors, outdoors, and underwater for recording precise information about the environment they are in. Some applications may include monitoring light or temperature in crops, filed conditions, water level, and indoor humidity etc. Additionally, the information on these loggers can be accessed remotely or via USB.

In Hackaday a man named Nikos started a project to protect sea turtles through  research which consisted of creating a small, cheap, and power efficient temperature logger. Temperature is one of the main factors in sea turtle egg incubation success, because of climate change increasing temperatures may affect this process, so researching and monitoring temperature changes in sea turtle nesting habitats is necessary to mitigate the impact of a changing climate.

The objective of the project is to develop a temperature logger that is accurate, stores records for at least 180 days, samples temperature every 10 minutes, can operate for 180 days with a coin cell battery, is waterproof, costs less that 5 euros and can easily transfer information via computer cable. For research a huge quantity of data is needed which is why many companies use many loggers with a lot of storing capability, but this may result in high costs.

The sensor chosen for the project is the MAX30205 which can achieve a 16-bit resolution at a low consumption and cost. The creator also considered the Silicon Labs’ Si7051 and Texas Instruments’ HDC1080, but the MAX30205 was chosen because it had more details in accuracy over its operating range (which is better for scientific research).

As the temperature sensor gives its reading in 2 bytes then for the 180 days with 10 minutes intervals of reading 414720 bits will be needed, so a 512 Kbit memory was chosen. Taking price into consideration the Adesto’s AT25DN512C that comes in TSSOP-8 package was chosen. An advantage is that this type of package is small enough for the objective and its also available for 4 Mbit versions, so extra memory can be used. Also, the mcu used was the ATMEGA328PB-MN.

The project has not been finished and some improvements have been made and others are planned to be made soon. If you want to follow this project and know how it develops you can found it on its Hackaday official website.

RoomSense Board offers multiple sensors including PIR motion detection

 

RoomSense Board is an Occupancy and Air Sensor.

It can detect movement and room conditions and connect over WiFi with a passive IR occupancy sensor, barometer, temperature and humidity sensors, and the Microchip ATSAMW25 module. Pre-flashed with the Arduino bootloader, the RoomSense is easily deployable as a home automation device by developers of all skill levels.

This tiny USB dongle uses a passive IR motion detector, and temperature, humidity and barometric sensors to monitor a room’s conditions and occupancy. The Microchip ATSAMW25 provides a SAMD21 Cortex-M0+ MCU and WiFi connectivity. It integrates easily with cloud IoT platforms such as MyDevices Cayenne.

Features

  • ARM Cortex-M0+ MCU at 48 MHz
  • 802.11b/g/n WiFi
  • Barometer, humidity and temperature sensors
  • Passive IR motion detector
  • Powered over USB

RoomSense Board offers multiple sensors including PIR motion detection – [Link]

Raspberry Pi Internet Weather Station

The RPi Internet Weather Station project displays the weather information such as temperature, humidity and successive weather forecast.

The 4DPi-35-II is a 3.5″ 480×320 Primary Display for the Raspberry Pi, which plugs directly on top of a Raspberry Pi and displays the primary output which is normally sent to the HDMI or Composite output. It features an integrated Resistive Touch panel, enabling the 4DPi-35-II to function with the Raspberry Pi without the need for a mouse.

Raspberry Pi Internet Weather Station – [Link]

Four-Channel Thermometer on OLED display

David Johnson-Davies @ technoblogy.com build a four-channel thermometer that monitors the temperature at four temperature sensors, and gives a continuous readout on a small 128×32 OLED display. It’s a useful project for various applications like PSU or PC monitoring. The article describes 1-wire and code in details.

It could be used in any application where you want to monitor multiple temperatures, such as in controlling a greenhouse, checking the output transistors in a power amplifier, monitoring key points in an overclocked gaming PC, monitoring the chips on a Raspberry Pi, or checking the temperature in different rooms in a home.

Four-Channel Thermometer on OLED display – [Link]

Bosch BME280 sensor combines pressure, humidity and temperature measurement

Bosch Sensortec announces a world first in sensor technology: the BME280 Integrated Environmental Unit combines sensors for pressure, humidity and temperature in a single package. This unique sensor has been developed to support a broad range of emerging high performance applications such as indoor navigation, home automation control, personalized weather stations and innovative sport and fitness applications. The precise altitude measurement function of the BME280 is a key requirement in applications such as indoor navigation with floor tracking where exceptional accuracy, low temperature drift and high resolution are needed. Additionally, the BME280 has a best-in-class response time of just one second for humidity determination, excellent ambient temperature measurement and low energy consumption.

More precise measurement at lowest power consumption

With a small footprint of just 2.5 x 2.5 mm2and a height of 0.93 mm in a space-saving 8-pin LGA package, the sensor offers high design flexibility and is ideally suited for mobile devices with limited space such as smartphones, tablets, smart watches and electronic wristbands. Very low current consumption of only 3.6 µA (at 1 Hz) makes the BME280 Integrated Environmental Unit particularly suitable for battery-driven applications. Three power modes and separately configurable oversampling rates for pressure and temperature measurements allow designers to adapt the BME280 to a wide range of use cases.

The humidity sensor within the Integrated Environmental Unit measures relative humidity (0% to 100%) across a wide temperature range from -40°C to +85°C with a fast response time of less than 1 second. The humidity measurement accuracy is ±3% with a hysteresis of 2% or better, and the temperature reading accuracy is within 0.5°C.

more details on the Bosch Press Release.

Arduino Weather Station using DHT11

Using a display to view the temperature and humidity of your environment can be possible using the DHT11 or DHT22 sensor with the easy to use Arduino microcontroller platform and that’s the goal of this project. For this project, we will be using the 16×2 LCD display module to display the temperature and humidity readings gathered from the environment using the DHT11 temperature and humidity sensor.

Arduino Weather Station using DHT11 – [Link]