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…
I’m working with Eagle to prepare a PCB for a Nixie clock. I wasn’t able to find a library for the Nixie I chose so I had to create it from scratch. Nixie’s datasheet has the following drawing about pins disposition: Let’s see how to draw it in Eagle, thanks to an ULP (User Language Program). Choose File – Run ULP……
It certainly happened to you that, when you connect a new USB device to your Windows PC, the operating system assigns the device a COM port with a high number because of the previous ones are in use: Windows indeed keeps the COM port reserved even if the device is not physically connected to the computer.…
Let’s finish building up our mini quadcopter with the installation and configuration of the flight control board. I mounted the Flip32 board on its plastic spacers, using plastic screws to fix it and avoid short circuits. Then I connected the cables from the ESCs to the connectors labeled M1/M2/M3/M4 (the number that corresponds to each motor is detailed…