Wolles Elektronikkiste • Die wunderbare Welt der Elektronik

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.

ESP-NOW Serial

ESP-NOW Serial is a new feature of the ESP32 board package from version 3.0.0, which is really easy to use. I will show you how to use ESP-NOW Serial.

ATmega328PB based boards

I will go into the differences of the ATmega328PB vs. the ATmega328P and introduce three 328PB-based boards and board packages.

HC-14 – the simple LoRa module

With the HC-14 module, you can use LoRa wireless technology very conveniently via simple serial functions such as println(). I’ll show you how it works.