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17 Jul 2014


by intensePancake @ instructables.com:

In recent years, portable sensor devices have gained a lot of popularity due to their ability to give you instant, accurate information about your local environment. Some of these devices include the Sensordrone, Smart Citizen, and the Storm Tag. These devices combine portability and accessibility in such a way that they’re easy to use and convenient to carry around. However, they can be expensive, as they’re required to pack quite a bit of advanced technology into a very small package.

This Instructable is for my Bluetooth Low Energy Go-Anywhere Sensor Pack (BLEGASP, if you will). It’s a device that I built from an Arduino and various environment sensors. Since environmental concerns differ from person to person, I wanted to create a device that maximizes sensor modularity.

Bluetooth LE Go-Anywhere Sensor Pack - [Link]

8 Jul 2014


Ondrej Karas of DoItWireless writes:

This article describes temperature and humidity measurement with DHT11 sensor connected to TR module. Circuit diagram is very simple. You need only power supply for sensor and one wire for data line. This line has to be “pull-uped” – sensor has open collector output.

Temperature and humidity measurement with DHT11 - [Link]

3 Jul 2014


The world’s smallest inertial sensors have already taken China by storm and are poised to take on the rest of us with their software iGyrpo which is affordable by any smartphone or tablet maker: R. Colin Johnson @NextGenLog

Worlds Smallest Acceleronmeter Priced for Any Budget - [Link]

27 Jun 2014


TMP75B 1.8-V Digital Temperature Sensor with Two-Wire Interface and Alert. by ti.com:

The TMP75B is an integrated digital temperature sensor with a 12-bit analog-to-digital converter (ADC) that can operate at a 1.8-V supply, and is pin and register compatible with the industry-standard LM75 and TMP75. This device is available in an SOIC-8 package and requires no external components to sense the temperature. The TMP75B is capable of reading temperatures with a resolution of 0.0625°C and is specified over a temperature range of –55°C to +125°C.

The TMP75B features SMBus and two-wire interface compatibility, and allows up to eight devices on the same bus with the SMBus overtemperature alert function. The programmable temperature limits and the ALERT pin allow the sensor to operate as a stand-alone thermostat, or an overtemperature alarm for power throttling or system shutdown.

TMP75B – 1.8V Capable Digital Temperature Sensor - [Link]

23 Jun 2014


sameer @ sgprojects.co.in writes:

Water level indicator plays a vital role in the world of water saving technology. It indicates five different level of water in a tank mostly used in housing water tank,cooler tank etc. The circuit is based on the microcontroller AT89S52 which is brain of the whole system. A CMOS IC4049 is used as a water sensor which provides input signals for the MCU. The output of microcontroller is connected to an LCD and a buzzer. LCD shows the water level in five steps. When the tank gets full of water,an alarm sounds.

Water Level Indicator using LCD - [Link]

16 Jun 2014


by Nancy Owano @ phys.org:

Sony’s advance in image sensors appears quite natural: the company has developed a set of curved CMOS image sensors based on the curvature of the eye. A report on the sensors in IEEE Spectrum said that, “in a bit of biomimicry,” Sony engineers were able to achieve a set of curved CMOS image sensors using a “bending machine” of their own construction.

Sony inspired by biomimicry develops curved CMOS sensors - [Link]

24 May 2014


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]

24 May 2014

Electronic scales are widely used in kitchens and bathrooms because they can quickly make accurate weight measurements.

A load sensor called a load cell is used for weight measurement.  Because the output voltage of this sensor is very small, it is amplified by an operational amplifier (op-amp) and input to an A/D converter.  A microcontroller (MCU) converts the signal to weight based on the conversion results of the A/D converter and displays it.

Renesas offers a lineup of microcontroller products for meeting their customers’ needs, such as the RL78/L1x, 78K0/Lx3, and R8C/Lx series with built in LCD driver for designing small and inexpensive models.  For highly precise measuring, they offer the 78K0/Lx3, the H8/38086R group, the RX21A group, and other with built-in high precision ΔΣ (delta-sigma) A/D converter.

Renesas MCU for Electronic Scales - [Link]

16 May 2014


by John Widder & Alessandro Morcelli :

The application of MEMS (Micro Electro-Mechanical Systems) technology to microphones has led to the development of small microphones with very high performance. MEMS microphones offer high SNR, low power consumption, good sensitivity, and are available in very small packages that are fully compatible with surface mount assembly processes. MEMS microphones exhibit almost no change in performance after reflow soldering and have excellent temperature characteristics.

Basic principles of MEMS microphones - [Link]

16 May 2014


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]





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