Wolles Elektronikkiste • Die wunderbare Welt der Elektronik

Async WebServer with the ESP32

I will show you step-by-step how you can control one or more ESP32s via your browser using the Async WebServer. We will switch LEDs, dim LEDs and read out values.

STM32 boards – Part 2: Selected functions

I will show you how to implement selected functions on STM32 boards using the Arduino Core package. I will cover timers, PWM, low power, I2C, SPI, ADC, DAC, RTC and more.

STM32 boards – Part 1: Overview and Upload

In part 1, I give an overview of STM32 and Nucleo boards and explain how to upload sketches to them using the Arduino IDE. Various methods are available.

SCD4x CO₂ sensors

I introduce the SCD4x CO₂ sensor modules and show you how to control them using the Sensirion library. I also check their reliability in comparison with a commercial measuring device.

DS3231-based alarm clock

I present concepts for a DS3231-based alarm clock. The alarm clock is controlled with only two buttons and a slide switch. I use the Nokia 5110 and the DOGS164 as energy-saving displays.

Preprocessor directives determine what the compiler shall ultimately process. To do this, they replace character strings and include or exclude lines of code. They also influence the behavior of the compiler.

tinyAVR Series Part 3: Timer D

The third part of this article deals with the Timer D, which is used exclusively for the tinyAVR Series 1.

tinyAVR Series Part 2: Timer A/B, CCL, SLPCTRL

In this sequel of my article about the tinyAVR series 0, 1 and 2, I cover the topics Timer A, Timer B, the Configurable Custom Logic (CCL) and the Sleep Control module (SLPCTRL).

Programming the tinyAVR series 0, 1, 2 – Part 1

The microcontrollers of the tinyAVR family differ significantly from the classic ATtinys. This is an introduction to programming at register level.

Formatted output

Generating formatted output with sprintf(), snprintf() and dtostrf() is convenient and simple. I will explain the various options as well as the pitfalls.