Vitruvius

Jovan Stosic December 17, 2018

Marcus Vitruvius Pollio (/vɪˈtruːviəs ˈpɒlioʊ/; c. 80–70 BC – after c. 15 BC), commonly known as Vitruvius, was a Roman author, architect, civil engineer and military engineer during the 1st century BC, known for his multi-volume work entitled De architectura. His discussion of perfect proportion in architecture and the human body led to the famous Renaissance drawing by Leonardo da Vinci of Vitruvian Man.

By his own description[2] Vitruvius served as an artilleryman, the third class of arms in the military offices. He probably served as a senior officer of artillery in charge of doctores ballistarum (artillery experts) and libratores who actually operated the machines.

Source: Vitruvius – Wikipedia

Francesco di Giorgio Martini

Jovan Stosic December 17, 2018

Francesco di Giorgio Martini (1439–1501) was an Italian architect, engineer, painter, sculptor, and writer. As a painter, he belonged to the Sienese School. He was considered a visionary architectural theorist—in Nikolaus Pevsner’s terms: “one of the most interesting later Quattrocento architects”. As a military engineer, he executed architectural designs and sculptural projects and built almost seventy fortifications for the Federico da Montefeltro, Count (later Duke) of Urbino, building city walls and early examples of star-shaped fortifications.

Born in Siena, he apprenticed as a painter with Vecchietta. In panels painted for cassoni he departed from the traditional representations of joyful wedding processions in frieze-like formulas to express visions of ideal, symmetrical, vast and all but empty urban spaces rendered in perspective.

He composed an architectural treatise Trattato di architettura, ingegneria e arte militare, the third of the Quattrocento, after Leone Battista Alberti’s and Filarete’s; he worked on it for decades and finished sometime after 1482; it circulated in manuscript. The projects were well in advance of completed projects at the time, but innovations, for example in staircase planning, running in flights and landings round an open center, or dividing at a landing to return symmetrically on each wall, became part of architectural vocabulary in the following century. The third book is preoccupied with the “ideal” city, constrained within star-shaped polygonal geometries reminiscent of the star fort, whose wedge-shaped bastions are said to have been his innovation.
St John the Baptist, 1464 at Museo dell’Opera del Duomo, Siena

Francesco di Giorgio finished his career as architect in charge of the works at the Duomo di Siena, where his bronze angels are on the high altar and some marble floor mosaics are attributed to his designs. The design of the church of San Sebastiano in Vallepiatta in Siena is also attributed to him.

Di Giorgio’s painting of the “Madonna and Child with 2 Angels” is found at the Lowe Art Museum in Coral Gables, Florida.
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Source: Francesco di Giorgio Martini – Wikipedia

ESP8266 Deep Sleep with Arduino IDE | Random Nerd Tutorials

Jovan Stosic December 14, 2018

Deep Sleep mode

Let’s start with a simple example. You need to use a wire to connect the RST pin to GPIO 16 which is labeled as D0, in a NodeMCU board. Simply follow the next schematic:

If you take a look at the NodeMCU pinout, you can see that GPIO 16 is a special pin and it has a WAKE feature

 

The RST pin of the ESP8266 is always HIGH while the ESP8266 is running. However, when the RST pin receives a LOW signal, it restarts the microcontroller.

If you set a Deep Sleep timer with the ESP8266, once the timer ends, GPIO 16 sends a LOW signal. That means that GPIO 16 when connected to RST pin can wake up the ESP8266 every time the timer ends.

Source: ESP8266 Deep Sleep with Arduino IDE | Random Nerd Tutorials