MakerBot replicator II
I had the chance to print some stuff on a makerbot replicator 2, unfortunately is was not myne but the one of a friend of a friend… By-the-way it was my first and great experience of 3D printing.
This post is my feedback on this experiment
TD1205 – sigfox
The TD1205 device is more than the usual Telecom Design Sigfox embedded circuit as TD1204 and TD1208, they are a all in one chip providing GPS antenna and RF antenna. Ready to use, to be clear you just need to plug a battery to use it.
In my point of view, for many applications not requiring more than 2 GPIOs, this product is really easy and chip way to design a SigFox product. As it costs around 55$ and you just have to add box & battery id sounds like the most affordable for small quantities. But …
This post is detailing what is specific to this chip ; read more following the link
sigfox hack board
I assume you know a little bit who I am and what I’m doing, I’m not the one to by > 100€ to buy a one shot development board kit to test & hack a device like the Telecom Design chip. So basically I built my own with the objective to work with multiple configuration.
My “cahier des charges” was to make a board able to be installed as a dauther board on a raspberry PI, able to support an arduino, able to run autonomously and being able to own a TD1204 as a TD1208.
It was a huge work to route it and I must recognize that it do not have all the GPIO connected as I expected but it exists, it works and it help me to build my first SigFox prototypes with success.
So, now, I propose to distribute this board to those of you looking for a such swiss knife.
The TD1204 is the GPS & Accelerometer version of the sigfox Telecom Design chip. After a previous post about the use of the accelerometers (here) I’m describing how to use the GPS module.
The embedded GPS is based on a UBX G7020 chip. This chip will give you the date, time, longitude, latitude, altitude, speed and direction of the device when activated.
Read more for programming details
The Telecom Design TD 1204, used on Sigfox network have a builtin 3 axis accelerometer and a lack of documentation as usual… By the way, here is the result of my searches to make it work.
Basically, the provided libraries makes it easy to use, in the setup part you have to initialize the accelerometers and in the main loop you have to run a TD_ACCELERO_Process(); method to monitor the IRQ and call your callback function to read the data.
It means that the accelerometers is not automatically waking up the device but managed during the 32KHz wakeup look.
The next part is detailing how to use it.
This post is mostly a remember for myself … The formula to get the right antenna size is the following one.
Wavelengh = 300 / FmHz
As an example 300 / 868Mhz = 0,345 m
Then the antenna will be 1/2 wave = 17,28cm or 1/4 wave = 8,64cm
Square is a template you can find on themeforest for 19$ for a single site and for a non profit website. It contains angular, twitter bootstrap and other package already configured to make your project quickly operational.
This post is detailing some way to use it. You won’t find everything but the points I had to search longer before finding a solution. Hope it will help
I spent some time playing with angular.js directives and try to understand what option you should not forget to make it works, this is detailing the result of these search.