Category Archives: Technology

Tips and test on technological product and components. Operating system, networks, hardware, security…
Astuces et tests autour de produits et composants technologiques, systèmes, réseaux, hardware, sécurité …

Telecom Design SDK – TD_USER_Loop working way

Posted on by
Reply

After some discussions this afternoon with TD support and get a good advice from them, this post details some notice about TD_USER_Loop working way and power saving.

For those like experienced with Arduino, Telecom Design loop is not working like

while(1) {
   loop();
}

But it is called on Interrupt ; I don’t know why but I was expecting it to be called every tick (32KHz) which was a wrong assumption. In fact, this procedure is called on wake up from any interrupt. The frequency of call can’t be determined, it can be not called in a minute if no events occurs. That is why schedulers helps you to have a predictable call.

SigFox downlink howto

Posted on by
21

antennaSigFox downlink is now available since the Telecom Design SDK 5. This allow to send a message to your SigFox device from the network. You have a 4 message a day limitation.

This post will explain how to configure and use SigFox downlink

 

Continue reading →

Telecom Design TD1207 – low cost sigfox transceiver

Posted on by
Reply
TD1208/TD1207

TD1208/TD1207

The Telecom Design TD1207 has been released. In fact this chip is a TD1208 you can’t reflash and you have to use with the builtin modem firmware. The datasheet is the same as 1208 the main difference is that you have no information about RAM and FLASH size. The TD1207 is at a lower price than the TD1208 (about -2$).

SigFox Down-Link is now available for TD chips

Posted on by
1

I was waiting for it since a long time, now it is ready ! The down-link code is available on the Telecom Design SDK version 5.0.0.

Thank to this upgrade we are now ready to receive 4 messages a day on a device and ready for device actions !

I recommend to reinstall the SDK or at least to clean all the previous build as in my case, updating from github created a lot of build issues.

Stay tuned, I’ll try and give some feedback soon !

Start playing with LiPo batteries

Posted on by
6
lipo battery

lipo battery

LiPo (Lithium Polymere) batteries are interesting batteries for IoT as they are nt so much expensive, easy to get with multiple form factors and multiple capacities. As they are used for radioguided planes and such toys, you have a lot of really small batteries available for a couple of euros.

The Lipo battery is typically providing 3.7V. This sounds good for 3.3V circuit. The charging circuit is quite easy and low expensive compare to some others battery technology.

But there is no miracle and a couple of problem I’m actually discovering and this post will introduce.

Continue reading →

Getting start with Tobeca 2 – 3d printer

Posted on by
Reply
3d printer is a kit

3d printer is a kit

The Tobeca 2 is a French and Open Source 3dPrinter. THis printer is delivered in a kit (you can also ask to get it built for a higher price) The price of the printer is about 700€ + 100€ for the dual head option I chosen.

So I’ll publish some post in the next days to detail the installation. My time is really short these week, so it could be long before I finish it. By-the-way if you have one to build of you want to buy one, I hope these notes based on my experience will help you.

Finally, I spent about 16 hours to mount the printer and a couple more to get my first print!

Continue reading →

RFRPI shield V1.2 released for RPI B+

Posted on by
7
Raspberry Pi B+ - RFRPI Shield

Raspberry Pi B+ – RFRPI Shield

I’m proud to announced the Raspberry PI shield for high quality RF433 have just been released to be compatible with Raspberry Pi model B+ (and A+).

The shield works exactly the same with the RFRPI lib. It is a little bit mode compact and modified to fit the usual cases.

You can contact me for orders.

Use node & javascript for web crawling

Posted on by
2

I recently have to crawl the web to get some data from a website, even if I’m more a Java addict and convinced that JavaScript is the 21 century basic, this language seemed to be the more efficient way to do this task.

I discovered for this purpose the use if crawler : a javascript library for node.js

This post details this experimentation.

Continue reading →