ESP32 Archive • Wolles Elektronikkiste

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.

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.

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.

Serial and SoftwareSerial

In this article, you will learn how Serial and SoftwareSerial work, which functions are available to you and how to use them.

Using FreeRTOS with ESP32 and Arduino

FreeRTOS is a real-time system, with which multitasking can also be realized on relatively small MCUs. This article is an introduction to the topic, whereby I will limit myself to the ESP32 and the AVR-based Arduinos.

Interrupts – Part 3: Timer Interrupts

The programming of timer interrupts is hardware-specific. I show in detail how it works on the ATmega328P, ATtiny85, ESP8266 and ESP32.

Interrupts – Part 1: External interrupts

Interrupts can be used to solve many challenges in microcontroller programming. However, there are also some stumbling blocks. This first part is about external interrupts.