Posts

This is an update to the installation tutorial I’ve already wrote.

Sometime you need to serialize a hierarchical model to JSON. Jackson offers different ways to handle the problem. Here I will expose two of them. tl;dr; First solution: Annotate the super class with @JsonTypeInfo(use=Id.CLASS). Pros: works with any subtype. Cons: breaks with classes or package renaming. Second solution: Annotate the super class with: @JsonTypeInfo(use=Id.NAME) @JsonSubTypes({ @JsonSubTypes.Type(value=Cat.class, name="Cat"), @JsonSubTypes.Type(value=Dog.class, name="Dog") }) adding a JsonSubTypes.Type for each sub-class. Pros: no problems with renaming if custom names are provided....

In this article I will show how flash your ESP8266 with Espruino and run JavaScript on the board.

In this article I will show how to build the framework under the Ubuntu’s like OS and flash your ESP8266-01 device with the latest Smart.js framework version.

In this article I will show how to read the temperature and the humidity from a DHT11 sensor connected to the ESP8266 device and how to send those values to a public site using an HTTP GET request, all using JavaScript code.

In a project I had to translate a search query into a filtering function to apply to a stream of JavaScript objects. The query language was very simple, boolean expressions of property constraints, for example “name:john AND age:52” where the search should return all the objects with property “name” equals to “john” and property “age” equals to 52. The first step was to parse the search query with a parser. You can write a parser by hand or your can use a parser generator like PEG....

As free time project I’ve built a digital clock using Arduino Duemilanove, the DS1307 Real Time Clock, the MCP23017 port expander and a bunch of blue leds.

In this post I will show you how to generate a navigable map of your family tree starting from an image of your tree.

This post will show you how a Dart program running in a Raspberry Pi board can communicate to an Arduino board.

For a DIY project I’m working on I need to run a Dart project on my Raspberry Pi board, precisely in his Raspbian OS. The Dart team has done a good job publishing a wiki page with all the information to build the SDK. Here I’m summarizing the necessary steps in a handy list, or, if you prefer, at the end of the post you can find a zip file with the SDK already built....