Arduino Breathalyzer Using MQ3 Gas sensor and OLED Display

A breathalyzer is a generalized trademarked name for devices used for determining blood alcohol content from a breath sample. This means the device can detect from your breadth, the amount of alcohol you have taken. This device becomes very useful when you consider several cases of accidents caused by drunk driving. With this device, you can easily warn the driver of a car when he/she is too drunk to drive a car. It is important to note that this project is not accurate enough to replace the standard breathalyzer and you shouldn’t drink and drive.

For this project, we will be using the MQ3 alcohol sensor. It is a cheap semiconductor sensor capable of detecting the presence of alcohol in air at concentrations between the value 0.05 mg/L to 10 mg/L. The sensor uses a chemical reaction to determine alcohol level and the primary sensing element in the sensor is SnO2, the conductivity of SnO2 is low in clean air but increases as the concentration of alcohol gas in air (breath) increases. It has high sensitivity to alcohol and has a good resistance to disturbances and noise from things like smoke and gasoline.

Arduino Breathalyzer Using MQ3 Gas sensor and OLED Display – [Link]

Raspberry Pi Zero Docking Hub

Add more connectivity to your Raspberry Pi Zero with this docking hub. Available on kickstarter for 16 USD and has 34 days to go.

The Pi Zero USB Docking Hub is a stackable USB Hub that comes with 5 x USB 2.0 data and charging ports, a micro USB port for power input, an RJ45 port for Ethernet, and a 3.5mm audio input/output jack. Installation would take only seconds. Just snap your Pi Zero onto the top of the docking hub station, the four pogo pins on the hub station will connect to the signal pads on your Pi. There is no soldering required!

Raspberry Pi Zero Docking Hub – [Link]

PCBite 2.0 – Hands-free & steady solution for your measurements

SensePeek launched a kickstarter campaign about their PCBite 2.0, a hands free assistance for your electronic measurements. The campaign has 17 days to go, with pledges starting from 30 USD.

 Last year we created the flexible and rock solid PCB holder – the end to wobbly circuit boards on your workbench. TODAY we proudly present the perfection of a measurement tool.  A steady but yet flexible precision probe made for instant measurements or total hands-free operations. PCBite precision probe has a flexible metal arm and a powerful magnet in the base .The measuring tip comes with a thread interface for several mounting options.

PCBite 2.0 – Hands-free & steady solution for your measurements – [Link]

RadarBox24.com – Live Flight Tracker and Flight Status

AirNav Systems develops flight tracking software able to live track flights from around the globe. The solutions are developed by real aviation professionals (airline pilots, engineers and air traffic controllers) -and RadarBox24 was developed on a real world aviation environment. ADS-B receivers used are AirNav RadarBox Pro and AirNav RadarBox 3D. Every RadarBox receiver is designed to share real-time flight data to AirNav Systems servers. Data comes from thousands receivers from all over the world and is processed (at an amazing rate of over 20 million messages per day). Finally data is provided in web browsers and mobile solutions.

Now you can build your own Raspberry Pi data feeder using RBFeeder client and sent data to Radarbox24. This short article will explain everything you need to know about our new Linux based client and how you can install it on your Raspberry Pi.

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]

How to reduce Arduino Uno power usage by 95%

Patrick Fenner @ deferredprocrastination.co.uk shows us how to reduce the power consumption of Arduino UNO. He achieved that by modifying the following parts.

To reduce the overall power usage of the Arduino UNO board significantly:

  • replace the linear regulator with a DC-DC converter,
  • adjust the USB-to-Serial circuit so it’s only powered from the USB port,
  • cut out (or desolder) the always-on LED’s on the board,
  • use the processor sleep mode.

How to reduce Arduino Uno power usage by 95% – [Link]

Instrumentation Amplifier For Pressure Sensor

General purpose differential amplifier project has been designed for various pressure sensor amplifier applications. Circuit provided with multiple resistors, capacitors, dual sensor options and 4 pin Header connector to interface other external sensors. Schematic is an example from NXP application AN1318 Figure 2.

The most popular silicon pressure sensors are piezo-resistive bridges that produce a differential output.

Voltage output is in response to pressure applied to a thin silicon diaphragm. Output voltage for these sensors is generally 25 to 50 mV full scales. Interface to microcomputers, therefore, generally involves gaining up the relatively small output voltage, performing a differential to single ended conversion, and scaling the analog signal into a range appropriate for analog to digital conversion.

Instrumentation Amplifier For Pressure Sensor – [Link]

8×8 pixel Time-of-Flight sensor is only 2.65×2.7mm

Swiss company Espros has completed its cwTOF imager family with the epc611, its smallest Time-of-Flight sensor to date, measuring only 2.65×2.7mm and delivering a 8×8 pixel field. by Julien Happich @ eenewseurope.com:

Sampling now and in volume production at TSMC, the chip can either be used as an 8×8 pixel imager for simple gesture recognition, door protection, or presence detection near machines, or as a fast range finder for simultaneous localization and mapping (SLAM) applications with rotating sensors.

8×8 pixel Time-of-Flight sensor is only 2.65×2.7mm – [Link]

Solar supercapacitor creates electricity and hydrogen fuel on the cheap

A replica of the UCLA device, which can produce both electricity and hydrogen

Researchers in University of California, Los Angeles (UCLA) made a device that may help bring hydrogen powered vehicles to the masses. This device uses sunlight to produce both hydrogen and electricity at the same time. The UCLA device is a hybrid unit that combines a supercapacitor with a hydrogen fuel cell, and runs on solar power. [via]

People need fuel to run their vehicles and electricity to run their devices,” says Richard Kaner, senior author of the study. “Now you can make both fuel and electricity with a single device.

Along with the usual positive and negative electrodes, the device has a third electrode that can either store energy electrically or use it to split water into its constituent hydrogen and oxygen atoms – a process called water electrolysis.

Google offers AI vision kit for Raspberry Pi owners

Google’s Vision Kit lets you build your own computer-vision system for $45 along with your own Raspberry Pi.

The company has now launched the AIY (AI yourself) Vision Kit that lets you turn Raspberry Pi equipment into an image-recognition device. The kit is powered by Google’s TensorFlow machine-learning models and will soon gain an accompanying Android app for controlling the device.

According to Google, Vision Kit features “on-device neural network acceleration”, allowing a Raspberry Pi-based box to do computer vision without processing in the cloud. The AIY Voice Kit relies on the cloud for natural-language processing.

Google offers AI vision kit for Raspberry Pi owners – [Link]