by amandaghassaei instructables.com:
Monitor your road speed using the Arduino. This project uses a magnetic switch (also called a reed switch) to measure the speed of one of the bike’s wheels. The Arduino calculates the mph, and send this information out to the LCD screen on the handlebars as you ride. It is compatible with any kind of bike/wheel, simply enter the radius of the wheel in the firmware to calibrate the device for your setup.
Arduino Bike Speedometer – [Link]
Wireless, Credit-Card sized, Android + Linux + Arduino™, Embedded Sensors, starting from $49. What else?
UDOO Neo embodies a new concept: a single board computer suitable for the Post-PC era:
- Like a Raspberry Pi, you can program it in any language and run a full Linux environment with graphic interfaces.
- You get all the simplicity of an Arduino-compatible board, thanks to the Cortex-M4 and the Arduino UNO pinout layout, with the possibility of adding most Arduino™ shields, actuators and sensors, both analog and digital.
- An incredible, smoothly-running Android 4.4.3, it gives you the possibility to build new Android-based smart devices.
- You get a wireless module: Wi-Fi 802.11 b/g/n + BT 4.0 (Classic Bluetooth and Bluetooth Low Energy), because we hate cables.
- 9-axis motion sensors are embedded, to build your perfect drone/robot/3D printers/whatever or create new kinds of interactions with the real world.
- Open-source hardware: because we love to let you hack things or create new devices from scratch!
- Starting from $49!
UDOO Neo = Raspberry Pi + Arduino + Wi-Fi + BT 4.0 + Sensors – [Link]
The LightBlue Bean is a low energy Bluetooth Arduino microcontroller. Using Bluetooth 4.0, it is programmed wirelessly, runs on a coin cell battery, and is perfect for smartphone controlled projects.
SAN FRANCISCO and MINNEAPOLIS April 20, 2015 Punch Through Design, a hardware and software development firm making it easier to develop Bluetooth Low Energy products, announced that the company?s popular LightBlue Bean has been used to create the winning device at the Bluetooth World Hack Challenge.
LightBlue Bean – Zero wires. Infinite uses – [Link]
I used specialized triple half bridge IC L6234 (~ 8$). You can make the same spending less money (but more time) with MOSFET transistors or other IC.
L6234 datasheet is surprisingly useless. Go straight to Application Note AN1088 instead.
I added current limiting resistors (1kΩ) to all INputs and ENable pins, a bunch of capacitors recommended in application note and current sensing shunt resistor 0.6Ω (big blue one).
Spining BLDC motors at super Slow speeds with Arduino and L6234 – [Link]
World’s first compact Arduino with integrated OLED+WIFI+SD CARD+32K SRAM for your 21st century projects! Play, create, embed, invent.
Piccolino (Italian for “tiny”) is a small, low-cost yet powerful programmable controller with an embedded OLED display and WIFI connectivity that you can program using existing tools like the Arduino IDE environment and the ESPlorer IDE. It uses the new ESP8266 LUA powered WIFI module which takes care of all the WIFI connectivity workload requiring only 3 lines of code in your sketches to establish a wireless connection. Furthermore, it can be configured both as an Access Point or a Station, so you can easily develop mobile device controlled appliances.
Piccolino: Arduino Compatible + WIFI + OLED + SRAM + SD CARD – [Link]
by jojo @ circuitstoday.com
Recently we have learned how to interface GSM Module with Arduino and send/receive SMS using GSM module. Interfacing any device with a micro controller is the first step to building a useful system or project with that particular device. In this tutorial, we are going to build a very interesting project – a Fire Alarm System which will send SMS to a set of Mobile Numbers when fire occurs in a particular location. We have seen many typical Fire Alarm projects which will alert with a siren or an automatic shutdown mechanism. This fire alarm project make use of modern communication technologies to deal with emergencies.
GSM based SMS Alert Fire Alarm System using Arduino – [Link]
by Juan J. Martínez:
This is my first serious attempt to learn electronics. DAN64 is my first project and it has been a discovery process during 3 months of my free time. I had to learn a lot of things I didn’t know much about, from basic electronics to the details of the AVRs -and specifically the ATmega328-, and a whole world of things in between such as signalling, protocols, interfaces, modulation and demodulation, SDKs, EDA software, prototyping, PCB fabrication, etc.
I’m certain that in this project I’m doing many stupid things and I’m sure my approach to solving some of the problems is not the best, but in my discharge I can only say: it works! (to some extent at least).
I got lots of gotcha! moments, ups and downs where I though I couldn’t finish the project because perhaps what I was trying to achieve was just impossible.
So this is not about perfection but about good enough for me and about the learning process and having fun.
DAN64 – an AVR based 8-bit microcomputer – [Link]
Arduino Project: Data Logging DS3231 SD card module and Arduino Nano DIY data logger
Arduino Project: Data Logging with DS3231 RTC, SD card module and Arduino Nano DIY data logger – [Link]
MAKE has posted Alasdair Allan’s three part series concerning the ESP8266 MCU. Alasdair highlights the capabilities and limitations of this chip, the installation and use of a supporting version of the Arduino IDE, and how to create a breadboard adapter for the ESP-01 breakout board (pictured above.) [via]
ESP8266: Arduino compatible $5 MCU with WiFi – [Link]
Ugifer wrote this instructable detailing the build of his Arduino based high-altitude balloon tracker:
The tracker is based upon the Atmel ATMeag328 Microcontroller which forms the heart of many of the popular “Arduino” boards. We are going to make an “Arduino Compatible” board which we can program using the Arduino IDE.
Because the GPS module and SD card both require 3.3v and we have plenty of computing power, we may as well make the whole tracker run on 3v3. That means that we can’t clock the ‘328 up to its full 16MHz but it will run happily at 8MHz on 3v3, and that’s plenty for our purposes.
Arduino based high-altitude balloon tracker – [Link]