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22 Apr 2014

LightMeterop3

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]

22 Apr 2014
Cross-section of piezo button assembly

Cross-section of piezo button assembly

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]

19 Apr 2014

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]

16 Apr 2014

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]


15 Apr 2014

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This instructable explains how to make a simple smoke detector using and Arduino and a Carbon Monoxide Sensor. The sensor is one of the MQ series gas sensors. Check out the demo here.

Arduino Smoke ‘Detector’ using MQ-7 sensor - [Link]

12 Apr 2014

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The MAX31730 temperature sensor monitors its own temperature and the temperatures of three external diode-connected transistors. The operating supply voltage is from 3.0V to 3.6V. Resistance cancellation compensates for high series resistance in circuit-board traces and the external thermal diode, while beta compensation corrects for temperature-measurement errors due to low-beta sensing transistors.

MAX31730 – 3-Channel Remote Temperature Sensor - [Link]

23 Mar 2014

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The “EasyPlug Shield” for Arduino makes it super easy to connect sensors to your Arduino. The EasyPlug shield provides an incredibly simple, clean, and quick way to connect sensors to your Arduino board. They have sensors for just about anything.

All of our sensors are designed to be easy to use, right out of the box. Plug in a cable (provided) and the sensor is ready to go. We’ve picked the most useful and fun sensors for you. But we’re adding more all the time, so you should be able to find a sensor to fit your needs.

EasyPlug: The Sensor Shield for Arduinos - [Link]

18 Dec 2013

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ricardouvina @ instructables.com writes:

Hello guys! In this instructable I’ll teach you how to make a very simple proximity sensor using infrared LEDs and Arduino.

Simple IR proximity sensor with Arduino - [Link]

3 Dec 2013

obr1440_uvod

Calibrated differential pressure sensors will find usage in industry and also in every smart home.

Ventilation, air conditioning (HVAC), or any other applications, where a pressure or a flow of air (gas) is essential, can be precisely regulated only if we know a real pressure/ flow conditions. Monitoring of fans functionality, status of filters, …, even for this purpose are very suitable differential pressure sensors from Swiss company Sensirion with an excellent accuracy and long-term stability.

As SDP sensors are differential, they have 2 nozzles. The base of these sensors is a miniature heating element and two temperature sensors. Difference of pressures will cause a small air flow through a component and it will cause a temperature difference in these built-in sensors. Temperature difference is directly depending on the amount (weight) of air flowing through a sensor and it naturally depends just on a pressure difference. A great advantage against membrane pressure sensors is a long-term high accuracy even at measuring of small pressure and maintaining of accuracy of a “zero point”.

obr1440_1

As an air specific weight depends on temperature, measurement based only on a temperature difference of two internal sensors wouldn´t be accurate. That´s why SDP sensors have a built-in temperature compensation and linearization, thus an output of a sensor is directly a value usable for further processing. Resolution of sensors is very high and is user selectable in a range of 9-16 bits. Resulting binary value read-out through I2C interface can be divided by a constant shown in a tab. 2.1 on page 3 of the SDP6xxv1.7 datasheet and we´ll get a resulting value in desired units (Pa, bar, inch).

obr1440_2

Universal and price-attractive series is the SDP600 (6xx) series, in which we´ll find types optimized for measurement of pressure (SDP 600/610), mass flow (SDP601/611) and types with a minimal power consumption suitable even for battery-operated devices (SDP606/616). All these types are able to measure “bidirectionally” i.e. positive and even negative values. For applications, where we know, that a pressure difference will be always positive (flow by only one direction), it´s possible to use more price-affordable types SDP 500/510 (in fact even these types measure bidirectionally, but their accuracy is not guaranteed in this range). For the most of applications no additional compensation is necessary, only it can be necessary to multiply a resulting value by a constant for an altitude compensation shown in a table 5.4 on page 6 in the datasheet.

How can be this small sensor used to measure flow of a big amount of air?

Relatively simply. All that is necessary is to make a small orifice in a pipe and this way to create a “resistance” as described in the SDPxxx_Bypass_Configuration application note. In an electronics analogy the differential pressure measurement is similar to measurement of voltage on a resistor, which depends on a current flowing through a resistor. SDP sensors can be used even for measurement of a pressure difference in a given pipe against a surrounding environment, in such a way, that one nozzle of sensor will be left “unconnected”. Naturally, such a configuration can only be used if a small leakage of a measured “gas” (air) is acceptable.

Sensirion SDP sensors measure pressure but even a flow - [Link]

27 Nov 2013

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Felix of LowPowerLab writes:

I’m calling it MotionMote because it detects motion and because pretty much every type of wireless sensor or Moteino node name ends in “mote“. The possibilities for home security are endless, put this little guy in a corner near a door or on top of a cabinet somewhere and detect them intrudaz! Did I say there’s no wires?
Read on for details and source code and case design.

[via]

MotionMote – Moteino motion sensor - [Link]



 
 
 

 

 

 

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