Arduino based bracelet with OLEDs

Wearable electronics isn’t something new to us. There are plenty development boards specially designed for such applications. But seems that there is plenty of room for creativity in this area. Arduboy introduces his ardubracelet project, where he builds a bracelet out of small Arduino board and flexible circuit which caries not one, but three OLED screens.

As you can see in demo, all three screens are linked as one allowing to play games like Tetris or use them as a watch. Controls on bracelet is done with touch senor pads. To make it complete there’s probably some polishing needed – 3D printing will fix this issue. Also there are promises of feature enhancements like Blue-tooth.


Microcontroller driven resistor decade box

Usually resistor decade boxes are mechanical – a rotary switch comutates resistors while turning it around. But if you decide to build one, you may face problem by selecting this switch. They seems to be quite expensive and quite old fashioned. Stynus has been planing to build one of those, but mechanical switching handle didn’t look very attractive, so he decided to switch resistors electronically through microcontroller.


He ended up by building three PCBs where one is a control board carrying LCD, PIC 16F648A microcontroller, rotary encoder and push button. Other two boards are resistor boards – one for high value resistors and another for low value. Each resistor board caries 16 small relays that are controlled through shift registers. Then only annoying thing with electronically controlled resistor box is that you need a power supply for it where mechanical boxes are passive. But seeing resistor value on screen probably pays off.


Custom Arduino keyboard for Minecraft players

Minecraft is pretty well known computer game where you have freedom to build and destroy world elements made of bricks. Some people find it very addictive while other call it waste of time. But all games are more or less waste of time aren’t they?


Lakhan Mankani finds Minecraft quite interesting and addictive, so he decided to build a special keyboard for it. He used an Arduino board which interfaces 9 Tactile switches. Gamepad extends existing PC keyboard with those nine buttons – they can be arranged as you like. With current Arduino sketch buttons work with default game controls. There are some issues with some laptop keyboards as it tends to replace its keyboard with gaming pad while playing.


Arduino 3D printer

It seems that Arduino won’t be known for only their development boards and software. Arduino officially enters 3D printing market with their Arduino Materia 101 3D printer. Printer is powered by Arduino Mega.


Arduino 3D printer will be available on Arduino store as a kit or assembled version. Cost of the kit is going to be around 800 USD. The official presentation of printer is at Maker Faire Rome, 3-5 October 2014. Here are few characteristics of printer:

“Printing technology: Fused Filament Fabrication

Printing area: 140 x 100 x 100 mm +/- 5mm

X and Y theorical resolution position: 0,06 mm

Z resolution: 0.0025 mm

Extrusion diameter: 0.35 mm

Filament diameter: 1.75 mm

Optimal temperatures with PLA: 200-230°

Tested and supported filaments: PLA

Unsupported but tested filaments: Cristal Flex, PLA Thermosense, Thermoplastic Polyuretane

(TPU), PET, PLA Sand, PLA Flex

External dimensions: 310 x 330 x 350 mm

Weight: 10 kg

Usage: 65 watt

Electronical board: Official Arduino Mega 2560 with Open Source Marlin Firmware

LCD display 20 x 4 with encoder menu

Preloaded with PLA printing presets

Extruder block with filament pressure regulation”