Designed for optimal interoperability with Nextion HMI, this universal TTL UART to MIDI interface transforms your favorite Nextion into a full-fledged MIDI controller. But we didn’t stop there. The NexMIDI (as my Chinese colleagues baptized it) is designed to be interfaced not only with any Nextion HMI display, but also with most microprocessors like Arduino, Teensy, PIC, STM32, Raspberry Pi, and so on. Logic level-wise, the RX pin of J2 accepts either 3.3V or 5V TX level from your Nextion Screen or from any MCU.

Who hasn't experienced this - you are coding a HMI project and there are parts, for example a settings page, which you want to protect with a password. And then, tons of thoughts and considerations arise: Where and how do I store the password for comparison with the user entry? How do I protect a specific page from unauthorized access? And so on... Neither the Nextion's integrated MCU nor the Nextion programming language give us the required computing power to do true and secure encryption. But we aren't left alone with that. There exist a few simple technologies which allow us to add some layers of security to our HMI project. You may use one, several or all of them, depending on your project's security specifications or your personal level of paranoia 😉

While the RTC of the Enhanced and Intelligent series HMI screens is pretty straightforward, once one has understood the concept of the RTC0 to RTC6 system variables, there is not much information about solving problems. That's why we see here a simple RTC demo project, followed by a video, explaining how to preset the RTC and how to fix issues.

Developing HMI projects A way around these "oops" moments It's hot outside. If you are lucky, you have air condition. I haven't. I live in a more than 400 years old house in France. But with air condition or without, everyone who writes Nextion code has already experienced this: You

Let's imagine that you want to build a battery controller. Your MCU (Arduino or whatever) retrieves the basic parameters (battery level, voltage, current) with the analogRead() function which returns abstract digital 10bit values between 0 and 1023. Instead of caring about conversion and scaling in your MCU code, let the Nextion HMI do this job - it has enough free resources. Just have your MCU sending the 3 raw numbers over. The Nextion will do all the math to display them correctly, and - as a cherry on the cake - it will even compute and display the electrical power from the voltage and current values.

Recent surveys tell us that people prefer looking at videos over reading. Thus, I decided today to keep up with these times and I produced a video, showing you a polyphonic (thanks to multi-touch) MIDI keyboard on a Nextion NX1060P101, connected to the new Nextion MIDI I/O adapter which will come to market very soon.