SIOS — the serial protocol syntax I made

When I first started making AVR modules, there was no Raspberry Pi or ESP8266. Arduino was introduced in 2005, the same year I started with the AVR microcontroller. But I didn’t know of it until many years later.

There weren’t any Wi-Fi enabled microcontrollers at that time. Both Ethernet and Bluetooth interfaces were more expensive, and harder to interface. So I ended up using the good old serial port.

I made my first module with a serial interface in 2007. RS-232 was cheap, and easy to implement.

With RS-232 I got a way of getting data between the microcontrollers and the computer, but I still needed a defined syntax. So I set out to make one, and called it SIOS — Serial Input/Output System.

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The rack box project

A 19" rack cabinet filled with electronics and AVR microcontroller modules — I called it: The rack box project!

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Serial interface module, with analog and digital I/O — AVR

Serial (RS-232) interface module; providing 6 analog and 2 digital inputs, and 9 digital outputs. Uses an AVR ATmega8 microcontroller.

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Serial port I/O module with 15 inputs — AVR

Serial (RS-232) interface module; providing 15 digital inputs. Uses an AVR ATmega8 microcontroller.

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Intruder alarm system controller — AVR

A simple intruder alarm controller I build and used in my old apartment. Uses an AVR ATtiny2313 microcontroller.

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