SquareWear 2.0, an open source wearable Arduino by Rayshobby:
This is SquareWear 2.0, an open-source, wearable Arduino microcontroller board. This version measures 1.7″x1.7″ in size, and has built-in LIR2032 rechargeable Lithium coin battery. It also has a number of integrated components (see below). It is designed to be sewable: you can stich conductive threads through the large pin pads, solder a wire directly onto the pads, or solder snaps onto the pads to allow quick attachment or detacthment from textfile and fabric. Best of all, it’s based on Arduino, so you can make use of numerous available Arduino libraries to help build your project! SqureWear 2.0 is perfect for wearable electronic projects as well as general-purpose microcontroller projects. It’s also a great little board for learning Arduino programming.
SquareWear 2.0 — an open source wearable Arduino - [Link]
We wrote this whole page to try to make buyers of USBasp programmer clones aware of what’s possibly out there for sale and the conclusion we came to about the units we bought, after quite some investigative work IT SIMPLY DOES NOT REALLY WORK !!!
We tried to read the flash content, and the blue led flashes, but that’s about it … it does not work
USBasp Experiences - [Link]
Terasic’s DE0-Nano houses the Altera Cyclone IV that features a low cost, low power FPGA ideal for high-volume and cost-sensitive applications. Boosting a miniature size of 49 x 75 mm and a weight of 40 g, the board was aimed for simple implementations targeting the Cyclone IV up to 22,320 LEs. The device utilizes small spacers as legs and even an acrylic cover on top of the board to provide better protection making this Development kit (Devkit) the option to choose for robust applications while giving of a sleek feel to users as they get to look through the device’s glass-like cover. The DE0-Nano definitely is one device to consider in making portable design projects where portable power is essential.
Running at around $80, users already get to enjoy a lot of other on board features. The DE0-Nano is equipped with a 3-axis digital accelerometer designed for better sensing applications. Other on board features follow in the form of 2 separate extension headers plus a third header that supports an ADC converter with 8-channels and 16 I/O Pins, 8 user LEDs, Push buttons and DIP switches. DE0-Nano also provides a three-power scheme option for designers through a USB mini-AB port, 2-pin external power header and two DC 5V pins.
Upon connection to the host PC, the FPGA Devkit automatically powers up and the LEDs start fading in and out. Once host PC has loaded up the DE0-Nano Control Panel, the LEDs stop fading indicating a full user access of the device. The DE0-Nano Control Panel is a GUI that allows users to automatically verify hardware components of the board. Users get to play around the LEDs and a GUI representation is also provided for the Push buttons and DIP switches. The control panel also allows users to work around with the memory and verify accelerometer coordinates and even provides an ADC tab that allows users to monitor the voltage levels in the different channels. The DE0-Nano Control Panel has a user-friendly interface that provides a fast response GUI that readily illustrates all changes made in the actual board. In general, the device is a great development board. It already has everything on board without having to pay for a lot of extras. Despite the DE0-Nano being an entry-level device, the well thought out and compact design definitely makes it a very complete and functional development board.
Terasic DE0 Nano – Product Overview - [Link]
T0m designed a Twin Triac AC switch on DP5050 PCB:
Double SSR for TO-220 package triacs and MOC* series optocoupled drivers. The schematic is based on a design by RobG posted to the 43oh forum.
Twin triac AC switches - [Link]
Here’s a low-cost single phase energy metering solution using Microchip’s MCP3909 metering ADC and PIC18F25K20 8-bit microcontroller. App note can be found here.
The meter was tested for a range of current from 0.1A to 20A using the Fluke 6100A Electrical Power Standard. Measurement results are visible on the LCD or on the Pulse Output. This document is intended to provide guidance for designers who are interested in using Microchip’s MCP3909 Metering ADC with synchronous sampling and PGA on current channel, and the low-cost high performance PIC18F25K20 microcontroller.
Low-Cost Shunt Energy Meter using MCP3909 and PIC18F25K20 - [Link]
This is the first book of Giorgos Lazaridis covering the BJT Transistor Theory. The purpose of this book it to help the readers understand how transistors works and how to design a simple transistor circuit. It is addressed to amateur circuit designer with little or no previous knowledge on semiconductors. The book is written to be easy to follow, so it keeps mathematical formulas as simple as possible. Feel free to download and read it. More topics will be covered later.
The BJT Transistor Theory - [PDF]
Brian posted an article describing how he designed and built his business card:
A business card should represent a person’s expertise. My expertise is in creating unique circuit boards, so to celebrate this I wanted to create a USB thumb drive circuit that contains my resume and contact information. This was also a great way to experience coding for USB applications using the Cortex M series of microcontrollers. As a side note, I have done other projects with Cortex M including a simple serial relay and a USB keyboard emulator, but this is the first one that is exciting enough to write about.
Business Card version 2 - [Link]
Bajdi documented his Arduino self balancing bot build:
For the electronics I used one of my own PCB creations, a Bajduino of course It’s just a small (50x50mm) break out board for an ATmega328. I’m running the ATmega @ 16MHz and 3.3V. It’s out of spec according to the datasheet but it works… I also needed an IMU of course. I found a MP6050 sensor in my parts box. The MPU6050 combines a 3 DOF gyro and 3 DOF accelerometer in a small package, ideal for a self balancing bot.
Building a self balancing bot - [Link]
Jie Qi from the MIT Media Lab and Bunnie from Studio Kosagi are hoping to crowdfund their idea for a new method of circuit building called Circuit Stickers.
A crossover between high tech and arts and craft, Circuit Stickers are not a serious prototyping tool but aim to find new uses for easily configurable electronics circuits so that they can be incorporated into other media such as books (basic science or fiction) or even wearable electronics.
Interconnect and power tracks made from sticky copper tape (or other conducting material) are laid out on any non conducting surface such as paper, material or flexible fabric. The individual components come ready-mounted and connect to the copper tracks via pads with sticky anisotropic (Z) tape. These can be peeled off later for reuse. There are two kits available containing a sketchbook to take you through the basics, colored LEDs, sound, light and trigger sensors and a tiny microcontroller with an ISP programming connector. That old Tee shirt looking a bit tired? Spruce it up with a running light display. [via]
Circuit Stickers: Cut and Paste Circuitry - [Link]
Frank Zhao posted his STM32F4 breakout board [via]:
I really like the STM32 family of ARM microcontrollers. This breakout board is a narrow design that fits perfectly on a breadboard. Every pin is accessible. It has USB, a reset button, and a bootload button. The chip itself has a permanent USB bootloader that is activated by the bootload button. This means that no equipment is required to program this microcontroller, no expensive debugger, nothing at all except a USB cable.
Design files are open source and can be downloaded, there is also a short video about the bootloader and more instructions
I am also giving away blank PCBs to those interested (see “giveaway” on my page), Seeed makes more than I need, every single time
STM32F4Stamp, a breakout board for STM32F4 - [Link]