Mni CNC laser engraver

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After the proliferation of 3D printers and working with the same XY axis system, desktop laser engravers have appeared on the market, just googling the title of this post to realize the wide variety available. The “assembly” that is exposed in this article is already a classic in the DIY world, it is about reusing…

LED cube 8x8x8

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Some time ago I had planned to build a LED cube like the ones seen on the net. They seem interesting artifacts with great animation effects, and they are devices with huge programming possibilities. It could be said that it is a three-dimensional display although of very low resolution, since each pixel (in 3D they…

ArduinoOTA & NodeMCU – WiFi Programming

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With the use of boards such nodeMCU and others that also incorporate the ESP8266 module it is possible, very simply, to upload sketches wirelessly, regardless of the USB connection, from the arduino development environment. This greatly facilitates the maintenance and updating of all those IoT devices that we design in this way. Implementation method is…

BMP280 pressure sensor & nodeMCU

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After several Arduino-based designs with the use of external Bluetooth and Wi-Fi modules, I decided to purchase a pair of NodeMCU – ESP8266 boards that incorporate Wi-Fi and BT connectivity and can be programmed from the arduino environment. There is also a lot of documentation about these boards. The idea is to use them to…

Hexapod Robot

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Back in 2015 I spent a couple of months building a hexapod robot after seeing several models on the web with prices totally out of my reach, whose purchase would also have deprived me of the adventure of getting involved in the design and construction process. To be honest, these commercial models such as “Phoenix”…

Tesla coil

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At the end of the last century (1999) when I was finishing my studies in electrical engineering I was fortunate to know the works of the most incredible engineering genius Nikola Tesla, but he was never sufficiently recognized. There are innumerable contributions to the progress of humanity, especially in electrical engineering, among others nothing less…

Marantz PM-50 HiFi amplifier repair

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A couple of years ago I came to my hands for free! although damaged, a great HiFi amplifier from the early 90s, the Marantz PM-50, 70W per channel, with tone control and input selector, including those of Phono with a small preamp. A few days ago I finally decided to bring it back to life…