To photograph the stars, you need a gadget that can track the revolving night sky in a perfectly timed arc. Otherwise all you’ll see is streaks and blurs.
The post 6 DIY Star Trackers for Perfect Night Sky Photos appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.
We never rest, even during summer, to serve our community and we announce today that we’ve refreshed over 150 example pages and redesigned the Examples area, offering an updated support to the current Arduino Software (IDE) Built-in and Libraries examples
Our website is a living entity that everyday hosts a huge number of visitors. They are looking for software, information, guidelines, ideas and also the right tutorial to start tinkering with their new board on a specific issue or project.
The Reference is the place where everything is documented and explained, with dry and essential information that is also included locally with every Arduino Software (IDE) installation.
Our software also includes a number of built-in sketches that help our users to quickly understand how the various functions and libraries may be used and applied to specific projects and tasks. We all started with the famous Blink and at the end of this tutorial we all felt the power and the excitement of having tamed our board with the upload of our first sketch. Keeping all these examples in good shape and updated is essential to keep you users safe from troubles or difficulties.
These examples evolve, as the libraries also evolve, therefore the sketches may be updated, amended or added. Each of these examples is commented and has an introductory part that gives a description of the purpose of the sketch and – if necessary – the instructions to put together the circuit. We know that the information provided inside the IDE and the sketches is not enough and therefore we made an area of our website where each sketch is explained and documented.
Year after year, board after board and library after library, many “hands” contributed to this area, filling gaps and amending things to reflect the Arduino Software (IDE) status. It has been an ongoing process that inevitably brought the Tutorials area in a state where many styles and ways of explaining things merged. We have big plans for our www.arduino.cc website and it is important to clean and fix the existing areas before we add new contents. This is why my first task – as editorial manager – has been the refresh and overall alignment of our Examples and Examples from Libraries pages.
We have roughly 150 pages documenting our Examples for the current products and libraries and going through them all wasn’t exactly a piece of cake: many things were checked for each example and sometimes things were outdated or missing. We also have our sister brand Genuino that got its space in all the relevant example pages. Now contents, style, look and feel and links in this area are ready for new and fresh developments.
I would like to end this post adding that this task was also a very good opportunity to refresh my knowledge about the powerful capabilities of Arduino programming language and its libraries. I had a few doubts on how to do a few things in my own sketches and going through all the examples gave me the hints I was missing.
The plain list of examples available in the Arduino Software (IDE) is just made of the sketch names, conversely in our pages you find a brief description of each of them. I suggest that you wander through these descriptions: let them excite your curiosity and inspire you!
A clever design for a homemade, radio-controlled BB-8 droid replica.
The post Yet Another Cool BB-8 Droid Project appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.
What would you pay for a 1.2Ghz dual-core ARM computer with 1GB RAM, 4GB onboard flash, 800×600 display, and 5 megapixel camera? Did we mention it also has WiFi, Bluetooth, and is a low power design, including a lithium battery which will run it for hours? Does $15 sound low enough? That’s what you can pay these days for an Android cell phone. The relentless march of economies of scale has finally given us cheap phones with great specs. These are prepaid “burner” phones, sold by carriers as a loss leader. Costs are recouped in the cellular plan, but that only happens if the buyer activates said plan. Unlike regular cell phones, you aren’t bound by a contract to activate the phone. That means you get all those features for $15-$20, depending on where you buy it.
The specs I’m quoting come from the LG Optimus Exceed 2, which is currently available from Amazon in the USA for $20. The same package has been available for as little as $10 from retail stores in recent weeks. The Exceed 2 is just one of several low-cost Android prepaid phones on the market now, and undoubtedly the list will change. How to keep up with the current deals? We found an unlikely place. Perk farmers. Perk is one of those “We pay you to watch advertisements” companies. We’re sure some people actually watch the ads, but most set up “farms” of drone phones which churn through the videos. The drones earn the farmer points which can be converted to cash. How does this all help us? In order to handle streaming video, Perk farmers want the most powerful phones they can get for the lowest investment. Subreddits like /r/perktv have weekly “best deals” posts covering prepaid phones. There are also tutorials on rooting and debloating current popular phones like the Whirl 2 and the Exceed 2.
Once you have your phone, the first order of business is to boot it up. Many prepaid phones try to force the user to go through an activation process. There is always a back door for installers to exit the process though. In the case of the Exceed 2, simply pressing volume up, volume down, back, and home quits out of the activation process.
Some applications require root permissions. To achieve this, your best bet is to do a bit of Googling for your particular phone model. The XDA developers forums are a great resource for this. While prepaid phones don’t usually have communities behind them like flagship phones, you can often find at least some information on what it takes to root your particular device. The most well-known “root every device” application to date is towelroot, created by GeoHot. You might remember [George Hotz] aka GeoHot as the first person to jailbreak an iPhone. He also made the news by getting into a bit of hot water with Sony over some PlayStation 3 security holes. Towelroot uses a Linux kernel exploit (futex) to gain root permissions. Released in June of 2014, the futex exploit has been patched on most new phones. However, it hasn’t been patched on phones that receive relatively few updates – like prepaid phones. On the Exceed 2, Towelroot works perfectly, giving the user root without even requiring a reboot. Once the phone is rooted, a root privilege manager like SuperSU is needed to keep track of which applications should have root permissions. Once that is done, anything goes! We’ve found packages like BusyBox to be huge helps – especially when working at the console through Android Debug Bridge (ADB).
Between these low-cost phones and the used phones every family seems to have floating around now, there are a heck of a lot of devices out there waiting to be used. What can you do with a spare Android phone? Quite a lot. There has never been a better time to learn to code for the Android Platform. Android Studio is the current official development environment. If you know a bit of Java, it’s easy to jump in and start making apps. If you’re not a Java head but want to learn, there are tutorials all over the web to help get into the swing of things.
Not a coder? The swiss army knife of automating android devices has long been Tasker. Tasker allows you to set off simple scripts (called tasks) with triggers which can be anything from plugging in headphones to connecting to a particular WiFi access point, to pressing a button on the screen. Want your smart phone to announce your arrival home with your own theme music? Just set up a Tasker profile to play a song when it connects to your home WiFi router. Tasker supports plenty of actions natively, and can be extended with plugins. Scripting Layer For Android SL4A) even allows it to extended with Python scripts.
Moving into the hardware world, there are plenty of ways to get GPIOs from an Android phone. The Android Accessory Development Kit (ADK) is getting a bit long in the tooth, but it’s still a great way to interface an Arduino board like the Arduino Mega ADK with your device. Another option for getting into the hardware realm is the IOIO OTG board. As the name implies, this new version of the IOIO board supports the USB OTG standard. This allows it to connect a phone either as a host or as an accessory. Need a simple wireless terminal for your project? Grab a terminal app and a Serial Port Profile (SPP) compatible Bluetooth module, and Bob’s your uncle. Interested in hacking with the ESP8266? There is an entire page of apps on the Google Play store dedicated to interfacing with everyone’s favorite low-cost WiFi module.
We’ve just covered the tip of the iceberg here. What kind of hacking would you do with a spare Android phone, or one of these low-cost prepaid devices. Let us know in the comments!
This plug-and-play rig will make it easy to control high-voltage outputs from a low-voltage Arduino.
The post Use an Arduino and Relays to Control AC Lights and Appliances appeared first on Make: DIY Projects, How-Tos, Electronics, Crafts and Ideas for Makers.
The project Emanuel Bombasaro submitted to the Arduino blog is about a high altitude balloon he launched on August 21st over Denmark. The balloon, called Titan 1, is made of a helium-filled latex balloon, a payload box holding the flight computer, sensors and a parachute (36” diameter). A GoPRO camcorder mounted inside the payload box and capturing an image every second.
The flight computer is an Arduino Mega which logs position (GPS), pressure, temperature, humidity, luminosity, earth magnetic field, acceleration and spin, measured by a variety of sensors:
At 1:10 we jump from cloud level (~3200m) towards reaching the peak altitude of 35393m. Immediately the moon appears on the right and is visibile again and again. 2:05 the fragments of the bursted balloon can be seen and up it goes back to earth. 3:00 we drop down to cloud level (~3200m) and soon after hit the ground.
This is the list of modules and sensors connected to the Arduino Mega:
Check the detailed documentation with Flight Computer Software sketch on this Design Mission PDF document.
You can also explore the Flight Data Report showing the collected mission data graphically on this PDF.
Omkar is a special 8 years old who created a wearable device called O Watch: an Arduino Zero-based smartwatch kit for kids. The project, recently kickstarted, allows young people to learn programming, 3D printing and a bit of craft while making their own smartwatch and customizing it. The kit will be released with a series learning tools including a kid-friendly website with easy tutorials, examples and a community to share creations.
He’s not new to DIY tech and learning as he’s been doing a few workshops to teach Arduino to other kids and likes it when they get excited about making Arduino projects. Omkar told us:
I was first interested in robots. But my dad got me started with projects that light up LEDs that were easier to learn and code myself. (ps: my dad did not let me get a robot kit at first :).
I decided to do a wearable project because there were many of them I saw in the news and I thought they were cool. I wanted to make a smartwatch so that I could wear it myself and share my project with my friends in school.
If you are a kid and are new to making, O Watch could be a great starting point as you’ll learn about coding, 3d printing, craft and also sharing. The Arduino IDE will be your primary programming tool for the watch, the case can be 3D printed in a color of your choice and you’ll experiment on how to knot yourself a cool band to wear it.
What are you waiting for? You have just a few days to back the project on Kickstarter and have an O Watch delivered to your home!
The USB interface is being increasingly used as a power supply and charging port for all kinds of devices, besides data transfer. A meter to measure the electrical parameters of devices connected to a USB socket or charger would be handy on any hacker workbench. The folks at [electro-labs] designed this simple USB power meter which does just that.
The device measures voltage and current and displays them, along with the calculated power, on the small 0.5″ OLED display. The circuit is built around an ATmega328. To keep the board size small, and reduce component count, the microcontroller is run off its internal 8MHz clock. A low-resistance shunt provides current sensing which is amplified by the LT6106 a high side current sense amplifier before being fed to the 10 bit analog port of the ATmega. A MCP1525 precision voltage reference provides 2.5V to the Analog reference pin of the microcontroller, resulting in a 2.44mV resolution. Voltage measurement is via a resistive divider that has a range of up to 6V. An Arduino sketch reads voltage and current data on the analog ports and displays measurements on the display. The measured data is averaged to filter out noise.
The OLED display has a SPI interface and requires the u8glib library. The project uses all SMD parts, but is fairly easy to assemble by hand and could be a nice starter project if you want to wet your feet on surface mount assembly techniques. It’s designed using SolaPCB EDA software, and the source files for schematic and board layout are available as a ZIP archive. Download the BoM and Arduino code and you have everything needed to build this nifty device.
Thanks to [Abdulgafur] for sending in this tip. And if you are looking for a more comprehensive solution, check the awesome Friedcircuits USB Tester which we reviewed earlier and is available in the Hackaday Store.
Marcelo Jimenez developed a library to use an Arduino as a JTAG programmer. Basically a Python script uploads a XSVF file to an Arduino which interprets it and performs the necessary JTAG manipulation in order to do the programming.
The project is pretty simple because it just uses a few resistors and some wires and the library is included in the Arduino library manager or you can check it on Github.
He also wrote an article to explain some JTAG, SVF and XSVF basics:
I have recently felt the need to incorporate a JTAG port in a project to program a hardware that contained a CPLD. The idea was to both program it and perform some integrity tests on the board. I imagined something using pogo pins, to make it easier and quicker to test everything. I would also write the necessary test routines and generate some kind of report.
With this objective in mind, I have decided to design an Arduino shield to do the job. The testing routines were not really a big deal. And I was sure I would find some JTAG library for Arduino ready to be used. That was not the case.
There were some projects using Arduino to control a JTAG TAP (Test Access Port), but they were all incomplete. And I had no idea what was really JTAG. So I had to study a little bit to make things work for me.
In the end, the challenge proved enlightening. There were some caveats, both from hardware and from software. I’ll try to address them in this article.
[Russel Munro] decided to go all-out for his son’s birthday cake: he made a Transformers robot cake that, well, transforms from a truck into a robot, Optimus Prime style. His impressive build has the actions of the original: first, the front rears up to lift the head, then the back lifts to form the body and the head and arms pop out of the top. Underneath the thin fondant exterior is a 3D printed body, driven by a mechanism in the base. He used fishing line to lift the parts, which is pulled by a motor salvaged from a CD player, being driven by an EasyDriver board from Sparkfun.
The main issue he had to overcome was weight: apparently he underestimated the weight of the fondant that covers the cake, and had to do some last-minute work to strengthen the drive mechanism, and skip plans for the more ornately decorated version that his wife had planned. But the look of glee on his son’s face when he operates it at the party is the best bit. In these days of CGI and computer games, it is good to remind the kids that there is still a lot of fun to be found in ingenuity and liberal quantities of hot glue.
