Free Back Article: Card Sound

STMicroelectronics has made available a software expansion package (I-CUBE-LRWAN) for developers working with LoRaWAN® STM32L4 microcontroller-based systems to implement the latest FUOTA specification...

Although most modern microcontrollers have an internal watchdog timer, that may not be safe enough for the system to rely on it. The built-in watchdog timer can reset the MCU but it cannot perform a power cycle. An external watchdog controlling the MCU’s power supply may be a better solution in some cases. There are dedicated ICs for that, but you can also make one yourself based on a 555 timer IC.

We get many questions about Arduino. Most of them have been asked before, and some several times. There is, of course, a countless number of webpages out there which treat most of these questions in some way, but it means digging through forums and blogs to find the answers. As this can be quite time consuming, Elektor Labs decided to compile their own Frequently Asked Questions (FAQ) for Arduino and write down the answers to them once and for all. So, before asking us, check our Arduino FAQ to see if the answer to your question is already there.

With the compliments of the Elektor Labs and Editorial teams, and our best wishes for the new year, here comes another previously unpublished article that's free to download by all registered Elektor e-zine readers. "Free Fresh Articles" are published at two-weekly intervals in the Elektor e-zine, alternating with "Free Back Articles". This time we have a Graphic User Interface (GUI) with touch control that’s remarkable for two things: First, it’s one and the same piece of hardware running happily on at least three popular microcontroller platforms: ESP32, ESP8266, and Raspberry Pi. Second, it employs elements from the LittlevGL library which comes with an MIT licence and produces code for many 16-, 32- and 64-bit microcontrollers.