In the previous blog post, I explained how to install the official development framework (Espressif IoT Development Framework) and how to use it to compile your first example, Hello world. Even if you can write your programs with a simple text editor (on Windows I always suggest to use the opensource Notepad++), it’s very easier to…
After having introduced, in the previous post, the ESP32 chip and the official development board by Espressif, today I’m going to show you how to install and use the official development environment. The official development framework for the ESP32 chip is published by Expressif on Github, with an opensource license (Apache 2.0) and named Espressif IoT Development Framework (shortly idf). To be…
You probably already know the esp8266wifi chip, made by Espressif. It appeared on some Chinese webstores in the middle of 2014 and in the beginning it was used as a “bridge” to connect microcontrollers (Arduino…) to wifi networks thanks to its very low cost (about 5$ for a module). Because of the original firmware was not well documented, it has…
Adafruit IO is the new cloud platform (at the moment still in beta) by Adafruit, designed to allow simple data connections using standard APIs and web-based dashboards. This new platform exposes MQTT APIs, you can therefore apply what you learned in my previous posts to create a complete project that takes advantage of all its features. The…
In the IoT they often don’t give much importance to the security aspects of the communcation. Proof of this is that many of the latest DDOS (Distributed Denial of Service) attacks have been launched by hacked Internet-connected smart devices. In the previous posts, you learned how to configure mosquitto to receive messages published by clients and…
In the first part of this tutorial, I introduced the concept of topics. Every message sent to an MQTT broker must be published to a topic and clients connected to the broker decide which messages to receive subscribing to one or more topics. Today you’ll learn the format of the topics and different ways to…
Being a comics fan, I couldn’t resist publishing a crossover between my “famous” tutorial about using the enc28j60 driver with Arduino and the fresh new tutorial about the MQTT protocol. So, after having introduced the MQTT protocol and explained how to use mosquitto, today I’ll show you how to send data to an MQTT broker using the…
If two devices have to talk to each other, they must adopt the same protocol. In the past, I’ve already shown different types of communication, for example between Arduino and a C# program, Arduino and a website or Arduino and an NTP server. All those communications are point-to-point ones, that is between two actors. Today I’m instead going to introduce you…
The PCBShopper website compares the prices of the most used PCB services. Jeremy Ruhland published on his Github’s repository an Eagle script (ulp, user language program) that automatically gets the required information from an Eagle project and compiles the PCBShopper web form. Let’s see how to use it: – first click on pcbshopper.ulp and display his source code (RAW button). – save…
Introduction During the development of my electronic projects, I sometimes need to develop a graphical user interface (GUI) that talks using serial communication with the devices I create. In the past, I usually chose to develop those interfaces in C# and using the .Net Framework; framework which allows a rapid development, offers great ways to customize the interface (for…