By European Editors
Air pollutants such as particles and noxious gases are known to be harmful to human health. In industry, on the other hand, high concentrations of gases such as methane or propane, or carbon monoxide resulting from poor combustion processes, can present an immediate safety risk. To overcome these problems, a wide range of groups such as homeowners, operators of commercial buildings or industrial sites, city councils, and environmental agencies need access to equipment for monitoring air quality and detecting the presence of various gases.
Sniffing the Air: Sensors for Monitoring Air Quality and Safety - [Link]
ICStation @ instructables.com writes:
ICStation team introduce you how to DIY this temperature & humidity & smoke alarm system based on ICStation Mega 2560 compatible with Arduino.The working voltage of this system is DC5V.It can measure the current temperature, humidity and smoke. It can display real-time data by the 1602 LCD and can realize the sound and light alarm when in the dangerous temperature and humidity. It is a simply and easily to operate monitoring alarm system about temperature humidity and smoke.
DIY Temperature & Humidity & Smoke Detector - [Link]
According to a press release from the ALPS Electric Co their HSHCAL humidity sensor is currently the world’s smallest commercially available digital humidity sensor. Preliminary information released by ALPS on the chip shows a 2 x 2 x 1mm package with six contact pads. [via]
The sensing mechanism uses changes in capacitance to measure relative humidity in the range from 0 to 100 %. Humidity readings are output as a digital value with a 14-bit resolution and a quoted accuracy of ±1.5 % RH at 25 ºC, 50 % RH. An internal temperature measurement feature outputs temperature information which is also used internally to compensate for the temperature coefficient of the humidity sensing element and improve linearity. The HSHCAL sensor operates from 1.71 to 1.89 V and draws 15 µA operating at 1.8 V and 1 Hz.
The company anticipate that the device will principally find a home in mobile devices such as Smartphones, wearable electronics and also in air-conditioning, air purification and refrigeration applications. The device is now in full production.
A Tiny Digital Humidity Sensor - [Link]
Allegro MicroSystems have announced the release of its ATS605 range of rotation sensors. This device provides a single chip solution to rotational position sensing of a ferrous gear target. Using three integrated Hall sensors together with Hall interface amplifiers, AGC stage, A/D converter and a synchronous digital controller, the ATS605 is able to accurately resolve the movement of much smaller-toothed cogs than was possible with previous revolution detector solutions.
Signals from the three Hall sensors are routed to two independent differential channels where digital processing with Automatic gain control helps compensate for magnetic variation and system offsets. The open-drain outputs provide voltage output signals which mirror the sensed target’s shape, with a phase separation between the two channels proportionate to the size of the target teeth vs. the Hall element spacing. These produce a highly accurate speed output and can also provide direction of travel information. Devices with an ‘H’ suffix have a maximum operational frequency of 40 kHz. [via]
Single Chip Rotation Sensor - [Link]
Ioannis Kedros writes:
I just finish the assembly process of my latest super mini project! It’s nothing amazing… but its a very handy sensor module!
On board there are three commonly used sensors: SHT10, BMP085 and MPU6050. I was constantly using those ones over my last projects and I thought it will be a good idea to make a simple module with all of those. They are communicating over I2C and the module can accept voltages from 3V to 6V.
Sensor Stick - [Link]
Here’s a simple cure for your posture and the back pain blues, a posture sensor by Wingman:
The simplest distance sensors are ultrasonic or infrared sensors. I went with a SR-HC04 because it is cheap and sufficiently precise. There are no special requirements to the controller so I am using an Attiny85. A small piezo speaker provides acoustic feedback to the user. The only thing left is the power supply for which 5V are needed because of the ultrasonic sensor. You could easily use an USB port but I did not want to rely on a computer, 3 button cells deliver around 4,5V and should work for a few days.
A simple posture sensor - [Link]
Raj @ embedded-lab.com writes:
A light meter is used to measure the intensity of illumination in a given area. It is widely used in schools, warehouses, factories, hospitals, office buildings, museums, art-galleries, parking garages, stadiums, and many more, to measure and maintain proper lighting levels. The intensity of illumination is usually expressed in Lux or foot-candles. As the 4th project in our chipKIT tutorial series, today we are going to build a digital light meter using the chipKIT Uno32 board and the BH1750 digital light sensor. This project uses Digilent’s chipKIT Basic I/O shield for displaying the measured light intensity in Lux, foot-candles, and Watts/m^2 units.
chipKIT Project 4: Digital light meter - [Link]
by Francesc Casanellas:
This design was done to get a sealed keypad for very wet environments (in my particular case, showers for swimming pools). The keypad needed to be able to detect slight pressure on a stainless steel plate 0.4mm thick. Apart from water protection, the solution offers an esthetical finish, as the user side is absolutely flat, with nothing visible other than the silkscreened print. Another advantage of this type of keypad is that it is vandal-proof. The core of the sensor is a piezoelectric disc, the type normally used as a buzzer. I chose the Murata 7BB-35-3. With 35mm of external diameter, it allows a sensitive area of about 20mm diameter.
Water & vandal-proof keypad uses piezoelectric disc as sensor and buzzer - [Link]
Low Voltage Metal Sensor directly compatible with Arduino type computers for Robotics, Hobbyists, & Engineers without using magnets.
The Low Power Non Magnetic Inductive Proximity Sensor is a Great way for Engineers, Makers, and DIYs to easily detect low permeability (non iron) metals such as aluminum. Why aluminum? Aluminum is widely available, inexpensive, very thin, and easy to apply. With a small piece of aluminum attached by tape or glue to almost anything, it can be detected by this Low Power Non Magnetic Inductive Proximity Sensor. Other low permeability metals such as copper can also be easily detected. This sensor is not to be confused with low cost magnetic sensors which obviously need magnets to operate.
Low Voltage Metal Sensor for use with Arduino type board - [Link]
What’s inside a Dräger Multiwarn II gas detection warning system used in mining, oil, chemical, and emergency services etc to detect hazardous or explosive atmospheres.
Intrinsic safety design and how both catalytic bead and infrared IR gas detectors work, and pellistors. And a teardown of a Hydrogen Sulfide (H2S) sensor.
EEVblog #603 – Gas Sensor Teardown – Dräger Multiwarn II - [Link]