HC-12 Radio Module

The HC-12 radio module is easy to handle and has a long range. I’ll show you how it works, how you make settings, and how you use it legally compliant (in Germany).

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Using IFTTT and Webhooks with the ESP8266

You want to be informed about out-of-control sensor readings on your smartphone (free of charge)? No problem with IFTTT (if this then that). I’ll show you step by step how to do this and how you track things online.

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IR remote controls

I explain how IR remote controls transmit signals and how to build a remote control yourself. I also present the IRLib2 library.

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ESP-01 port expansion

Port expansion for the ESP-01 using the MCP23017, PCF8574 and the 74HC595 shift register are explained in this post. With circuits and sample sketches.

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ESP8266 ESP-01 module

Controlling ESP-01 modules with the Arduino IDE is explained step by step. I provide example sketches with circuits. Also: AT commands.

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MP3-player YX5300

Control your YX5300 MP3 player with the SerialMP3Player library. And: how to (voice-) control the MP3 player with the smartphone. Also: SD card problems?

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