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.

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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.

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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.

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ESP-NOW

With ESP-NOW you can easily send messages of up to 250 bytes between ESP32 and/or ESP8266 boards. A step-by-step introduction.

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