This perpetual calendar displays the date, month, and day using cryptic rings

Earlier this year we covered an automated perpetual calendar, which used three ring gears to align the date, month, and day of the week with a viewing window. After building one of these devices, Wolfspaw was inspired to put a new “spin” on things by combining it with a linear Cryptic Calendar, featuring digits that only make sense in the viewing window.

The resulting project looks like a few rings inscribed with alien symbols, until each is rotated in place. This frames the numerical date, as well as abbreviated month and day so that they can be read.

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DeLorean Electric Car Conversion: Behind The Build

A lot has changed since Back To The Future was released in 1985. During these last 3.5 decades, we’ve seen a plethora of hybrid and electric cars enter the market – from the practical Toyota Prius to the industry disrupting Tesla. The EV revolution has also inadvertently led to a new era in DIY electric cars. With more electric cars on the road, Motors, inverters and battery cells, which used to be hard to come by, are now readily available on the after market.

John DeLorean’s DMC-12 – the car we all know and love as Doc and Marty’s Back to the Future Car was meant to be the definitive sports car of the 1980’s. The gull-wing doors and stainless steel exterior made it a unique curiosity for car enthusiasts. However, there was one big problem with the DMC-12, its small 6 cylinder engine put out a feeble 130 hp. But for one special DeLorean, a Buick Grand National Engine swap created, what was referred to as, the world’s fastest DeLorean. The turbocharged 4.3 liter v6 was tuned to 570 horsepower.

DIY Android+Arduino Controlled Labyrinth (Maze) Game

The device presented in the video represents marble maze game that is controlled using a smartphone via Bluetooth connection.

The device consists of two parts. The first is the Arduino part where the servo motors are controlled and the second part where the signals generated by the accelerometer are sent via the Android smartphone. It consist few components:

– Arduino Nano microcontroller

– Bluetooth adapter

– and two 9g servo motors

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Minimal metal detector made with an Arduino and a coil of wire

For an easy DIY metal detector setup, look no further than this project by creator “rgco.” 

The handheld device uses a 20-60 turn coil of 26AWG enameled wire, connected across an Arduino Uno or Nano’s pins 8 and 10. A series of pulses is continuously sent out by pin 10, which are delayed in reaching pin 8 according to the inductance across the coil. As this coil approaches other metallic objects, the effective inductance changes, thus varying the delay in the signal reaching pin 10.

This effect is sensed by the Arduino, outputting chirps on a buzzer as audio feedback when metal is nearby. To convert it into a practical device, the Nano configuration is stuffed into a Tic Tac container, with the coil held at a distance with two skewer sticks.

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AM/FM/SW Radio Receiver – Si4730 / Si4735

This Arduino radio receiver has an attractive look and nice features using an inexpensive color TFT / Arduino and fell componets.

It includes the indication of the frequency in large numbers in the style of vintage seven segments, two bargraphs for indicating the signal strength, selection of 7 BW filters for AM, indication of the wavelength of the band, 2 color themes, Stereo/Mono indication and 14 bands for coverage of LW / MW / SW / CB, ranging from 100kHz to 30MHz and the commercial 64-108MHz FM band.

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