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]
Make Galileo’s Finger: and open source star finder. via instructables:
Given the opportunity to use one of the Intel Galileo boards, we wanted to build something that would honour Galileo’s memory and pay tribute to his discoveries. What better way than to do something related to his primary focus – astronomy.
Being an avid astronomer, and loving being able to look up into the night sky and know what star or planet I’m looking at, I thought a cheap, accurate laser pointer would be perfect.
With the right idea in mind, and three weeks in which to do it, my partner and I set off coding and building.
Build An Open Astronomy Learning Tool With Arduino – [Link]
31 March 2015, Seattle–For a killer price of only $30, the small and rugged Arachnio puts taking the Internet of Things everywhere, easily within reach.
Confident that the Arachnio will be a success–as the first wireless Arduino variant to integrate the ESP8266EX WiFi chip, Logos electromechanical has launched the Arachnio as a Kickstarter project with perks for early supporters.
The Arachnio’s versatility means it can be used for many different types of projects, such as deployable sensors, audio visual applications, robotics, and smart home automation. “The number of applications the Arachnio can be used for is almost limitless. It will appeal to hobbyists, hackers, developers and researchers,” said Logos Electromechanical founder and principal engineer, Pierce Nichols.
The following features make Arachnio a standout:
- Integrated WiFi — No extra parts to buy or integrate — just load an easy-to-use library and connect to the Internet! The ESP8266EX WiFi chip on the Arachnio works beautifully with the Arduino core.
- Small and light — The Arachnio is only 50 mm long, 18 mm wide, and weighs less than 10 grams with headers installed.
- Rugged — Due to its small size, light weight, and the robustness of the Atmega32u4 processor, it’s hard to kill.
- Low power draw — In deep sleep with the power LED removed, current consumption is below 50 microamps on a single Li-Po cell.
- Arduino Micro pinout — The Arachnio uses the same pinout as the Arduino Micro and is only very slightly larger in order to accommodate the integrated antenna.
- Breadboard compatible — Standard 0.1″ headers enable you to plug directly into a breadboard for easy prototyping.
- Fully open source — everything including the board layout and the network stack is open source.
ARACHNIO – Arduino Variant with WiFi – [Link]
by Mahesh Venkitachalam:
I was in Bhutan last December, and as we travelled to different locations, I kept wondering what the temperature and altitude was, and wished I had some gizmo that would show me these values. Back home, I did a bit of research on altitude sensors, and one that came up was the cheap BMP180 sensor. It measures temperature and pressure, and the latter can be used to calculate the altitude. It’s been lying around with me the past few months, and now I’ve finally gotten around to building a display around it.
Temperature / Altitude / Pressure Display using BMP180 – [Link]