Sample data from ADC with Sigfox / Telecom-Design

I just finished a program started a couple of month ago. When I stared to it, I had a hard work to find how to sample a group of  256 values at 32Khz with the EFM32 device embedded in the Telecom Design TD1204 / TD1208 used for my SigFox project. This post details how to do this task

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Low consumption audio capture circuit for arduino

I had to work a little bit on an audio solution to get sound samples using a micro-controler. I based my design on an Internet really known circuit but I had to optimize it a little bit to be more efficient in terms of energy. This post is giving the result of my hack.

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Getting start with angularjs (installation)

angularHere are some key steps to make angularjs running on a CentOs 6. Angularsjs is a javascript framework from Google. This post is describing the first step to install nodejs, yeoman (bower, grunt) … up to the server start and kind of hello world display.

 

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Install GateOne – an HTML5 ssh client

gateone_loginWith the growing firewall constraints accessing a server over ssh is not always a pleasant journey ; I’ve read a korben post on GateOne html5 server side ssh client and I just got an opportunity to deploy it for a test. This post will detail how to install it and secure it a little bit.

 

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TD1208 – How to implement RF LAN

2 TD1208 configured as RF Lan
2 TD1208 configured as RF Lan

TD1208, SigFox chips, include a RF LAN fonction, this allow you to communicate between different TD1208 chip, locally, without using the SigFox network. This is really interesting if you have a network of sensor, you can connect them this way to a gateway. This gateway will then transmit the information to the SigFox network to reach your IoT service.

This post will describe how the rf_lan work and how to implement it.

I’m not fully sure I implement it the right way as the given example are really poor, the documentation is a mess and the source code of this part is not accessible… More over, my feeling is that this part of the SDK is still running bugs. What I mean is that in a future post you should find an update and a better way to do it than the one I’m going to describe. By-the-way, what is here is working, have fun with it !

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Use a PIR sensor

Pir sensor
Pir sensor

This is a PIR ( Infra Red ) sensor ; this device is detecting movement of people by sending a signal on its output. This sensor is generating a +3.3V signal on output when a movement is detected. The duration and the sensitivity can be parametrized.

As you can see on this photo, you have 3 things you can configure on this device that will impact its behavior. The purpose of this post is to describe the use of each.

 

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