SIM800L module

With the SIM800L, you can add mobile phone functions to your projects, e.g. make calls or send measured values via SMS and much more.

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TCA9548A – I2C Multiplexer

I show you how to use up to eight I2C components with the same address with the I2C multiplexer TCA9548A. Alternatively, you can use MOSFETs as well for this purpose.

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LED dot matrix display control

I show you how to control an LED matrix display and how you can create a running font. I use the LedControl library, but I also show how to do it without.

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LM393 – turns analog into digital

Using the LM393, analog sensors can deliver digital signals. This can make programming much easier. In this article I will show you how this works using an LDR (light dependent resistor).

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Port expander MCP23017

The 16-bit I/O port expander MCP23017 is introduced including a library. The functions are explained by sketches and circuits.

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