Author Archives: Paul

What is LoRa ?

Lora-300x171LoRa is a dedicated network for Internet Of Things and Machine2Machine communications. It is actually the main competitor against SigFox.

As LoRa is actually rising in France with different announce from 2 of the main cellular operators deploying the network, it is a good time to have a post on what it is, how it works and what differs compared with SigFox.

Continue reading

Posted in IoT | Tagged , , | Leave a comment

Silabs EFM8 a low cost microcontroller based on 8051 core

EFM8 chip
EFM8 chip

If you my blog and the lesson section you may notice my interest for 80×51 micro-controller family. Silicon Labs has recently launch a new 8b family based on this core.

With price less than 1 euros, they are interesting candidates for low cost hacking and hardware design. Even the programming cable is not really expensive ( $35 + port + Tax ) and the development environment is free.

EFM8 provides a 50MHz core with all the usual I/O – Serial, I2C, SPI. Plus 12 bit ADC, voltage regulator, oscillator…

Continue reading

Posted in Hardware | Tagged , , | Leave a comment

WordPress revolution slider – start an animate on scroll

wordpress-logoThe revolution slider is a way to animate a web page based on a wordpress plugin. When you create a slider it start to be animated directly when the page is loaded. So if your slider is on top of the page it is perfect but if your animation is on the middle / bottom, the animate will be finished when the user will scroll to that part.

It is possible to custom the javascript part and fix this problem as described in this post.

Continue reading

Posted in Programming | Tagged , | Leave a comment

Choose your smd (MLCC) capacitor

mlcc-smd-kondensatoren-foto-samsungThere are different type of smd capacitor ; the one I mainly use are mlcc – multi layer ceramic capacitor. In this technology, there are different dielectric (NP0, X7R, X5R, Y5V) with different characteristics.

I was looking for informations about this and found different nice website. I’ll try to summarize what I found in this post.

Continue reading

Posted in Hardware | Tagged , | Leave a comment

Sigfox on the move !


In many occasion some of my Sigfox prototypes has been in movement with difficulties to emit ; many source can cause this but basically from discussions with specialists speed is not a close friend of Sigfox technology.

As a quick test is always better than a long theorical discussion, tonight, I took my car and made some tests.

This post details the test of Sigfox running in a car at different speed.

Continue reading

Posted in sigfox | Tagged | Leave a comment

Some GNSS / GPS stuff that are good to know for IoT

gpsWhen you start developing a GPS solution, you have to deal with energy and for this you have to create a strategy based on what you expect and the size of your battery.

Basically, a GPS is consuming about 25mA when running. The first time you start it, it have to sync with the satellites, get the ephemeris then you can position in 2D then in 3D.

Read more for more informations

Continue reading

Posted in IoT | Tagged , | 1 Comment