Free PHP hosting and Yoctopuce API

By martinm, in Internet of Things, october 28,2016.

A noticeable characteristic of Yoctopuce modules is that you can drive them from a server thanks to the HTTP callback API allowing you to work around NAT filters. Obviously, this is truly interesting only if you have a PHP, Java, or ecmascript server. Well, this week we tested some free PHP hosts and we show you in details how to configure them...

Measuring outside air quality

By mvuilleu, in Measures, october 21,2016.

There is no magical sensor able to measure air quality in any circumstance: for each environment, you must select the appropriate sensor. We have already presented in this blog some ways to evaluate inside air quality, in particular to detect stale air because of CO2. We also talked about sensors that you can use to detect toxic or foul smelling gases, used in particular in the industry. Today, we address how to measure the quality of outside air, that is, the air that everyone breathes daily.

Calibrating a Yoctopuce sensor

By seb, in Measures and Programming, october 16,2016.

Generally, we always try to use sensors which do not require any calibration. But, in some cases, we cannot work around this step, in particular if you need to compensate an external perturbation. All the Yoctopuce sensors have the possibility to automatically apply a correction to the value returned by the sensor. Let's see how it works.

A screen that consumes (almost) nothing

By martinm, in DIY and Internet of Things, october 07,2016.

The issue with most screens is that they need to be constantly powered to display information. There is however an exception: the e-paper (or electronic paper) technology. This week, we take advantage of this technology to build a connected screen able to work for months on a single battery charge.

Accelerometers and gyroscopes: fantasy vs. reality

By mvuilleu, in Measures, september 30,2016.

The widespread use of game controllers and augmented reality tools based on accelerometers and gyroscopes raises many ideas for applications. However, some of these applications are more a fantasy than a reality, as enthusiasm sometimes makes us forget some basic physical principles. So, here is a little reminder to help you avoid cruel deceptions...