Archive for the ‘batteries’ Category
Open Electronics‘ staff were looking for a common and standard hardware platform usable on different robots they were working on. Their goal was to find a single platform that had to provide power supply to the microcontroller, it had to provide stabilized voltage for the servos, and, finally, it had to be equipped with an obstacle detector and with an IR receiver.
Having chosen Arduino as the target core board, they developed an ad-hoc shield meeting all these requirements, whose detailed description can be found here, together with the BOM and a lot of source code.
[Via: Open Electronics]
Impressing automotive hacking lets this FIAT car moving by the number of “like” from the Guarana Antarctica Facebook Fan Page. The advertising idea is simple: let the social audience support this Sau Paulo to Salvador trip to reach the Carnivalby commenting / “liking” the page. The onboard Arduino ADK (connected to a tablet and the internet) allows the car going on by a certain amount of meters (apparently one “like” is 10 meters, while each comment lets the car go ahead for 20 meters).
[Mykle Hansen] explains how to make a Speed Vest displaiyng the speed of the bicycle, as seen on Make: 19. This is a cool intro-project for wearable electronics.
Bicyclists receive a lot of honk-based grief from car drivers who perceive them as slow and in the way, and when drivers misjudge a bicycle’s speed, it can cause “right hook” collisions that kill several bicyclists each year. This lightweight night-cycling vest displays your current speed in glowing, 7-inch-tall numbers easily visible to cars. On the back, an Arduino microcontroller reads input from an off-the-shelf bike speedometer sensor, and then switches power to sewn-in numerals made from electroluminescent (EL) wire.
[Pierre] shares an interesting geo-localization project of sound, narration and culture, made in ”plan d’Aou”, a district of Marseilles – France. The project dates back in September 2010, within the framework of the Smala project in order to trace a sound cartography of Islam in the city of Marseilles: the guys at [Echelle Inconnue] took their time to fully document the all project with schematics, codes, fritzing diagrams and so on.
Several mobile systems were distributed to the people to accompany their walk across the district with, by hand, a kind of speaker to be press on the walls which makes it possible to listen to the sound by vibrating the material of the wall.
The materials of urban furniture or buildings become the speakers required for sound diffusion. Each resonant body had its acoustic specificities, the words take shape in metal, wood or glass… Textures of the sound fluctuate from a surface to another and the listener must juggle with these characteristics to obtain a quality of optimal listening, between documentary in the walls and poetic sound creation.
Nice post from the latest Hackaton in Malmo Hackerspace:
For the Hackathon event last weekend, we wanted to build a robot and decided to go for a kiwi-drive. The kiwi-drive is a three wheel drive configurations that use special wheels to achieve omnidirectional movement. The robot was designed in Corel Draw (that’s what the laser cutter prefers) during the two weeks leading up to Hackathon and parts were purchased so that everything would be ready when the build started. We also moved the design from Corel Draw, via AutoCAD for cleanup, to SketchUp for a virtual test assembly and rendering to make sure everything would fit together.
[...] The Arduino provides a simple serial interface and does all of the required drive calculations. It also provides an add-on interface that can be accessed using the same serial link and allows up to over a hundred expansions to easily be added to the system. The first two addons will be a battery voltage monitor and an emoticon display.
Want to build one? check the wiki of the ongoing project with part list and code (soon).
The JEEPuter is a programmable push-button system for controlling things like ignition, GPS navigation system, CB radio, RF scanner, 110V inverter, external and internal lights, and garage lights too. The JEEPuter also has temperature and light sensors which can set the dash lights and internal lights on autopilot. As a final touch, the Jeep’s ignition starts when you type a passcode instead of turning a key. While the JEEPuter is specifically for the Jeep Wrangler, you can learn from the build and apply the techniques to your own car.
[scolton] made a nice self-balaced vehicle based on two DeWalt cordless drills and an Arduino Nano:
Segstick is a self-balancing…well, literally some kind of broomstick I found in the MITERS workshop. It is powered direct by two DeWalt cordless drills chucked to two 6″ wheels. The controller is an Arduino. Additional supporting devices include an Inertial Measurement Unit (IMU) from Sparkfun and two motor drivers from Pololu .
see the compete how-to on [Instructables]
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[Jeff Crystal] on Voltaic Systems tells us three innovative ways to to power up arduino:
Direct to a Solar Panel – We plugged our 2.0 Watt, 6Volt panel into the Arduino’s 5.5mm x 2.1mm DC Jack via our Generator Circuit Box. On a hazy day and through a screen, it lowered the basic blink application. Of course, this will only work when there is sunlight and your application can work with extended downtime. The circuit box set has two outs so you can send power to another part of your application if needed. The panel is also available from Adafruit.
A 5Volt Battery with a USB Port – There are a number of battery packs out there with an integrated USB port. Our 3,000mAh Battery Pack V11 connects to the Arduino via a USB A/B Cable. The major downside is that there is a one hour shut-off in our battery if the load is drawing less than 50mA. This is great for preserving battery life in the pack but not great if you need to run the Arduino for over an hour. You can restart the battery by pressing the Power Button.
Solar & Battery Hybrid – We were pointed towards these Tenergy Lithium-Ion Cells (3.7V 2600mAh) and this smart battery case (puts two Li-Ion 3.7V cells in series) by office neighbors Breakfast NY. We connected three of our 10Volt panels in Parallel with our Generator circuit box (As an alternative, you could wire two of our 2.0 Watt, 6Volt panels in series to charge this configuration), connected the circuit box to the Arduino’s DC Jack, then connected the second out from the circuit box to the 2 Li-Ion cells. The circuit box has a blocking diode which prevents power from draining from the batteries into the panel. When the sun goes down or is obscured by clouds, the batteries will kick in and provide power to the Arduino. When the sun is up, excess power goes into the batteries for later. Both the batteries and the battery case have built-in protections against overcharge and short circuit which simplifies the amount of supporting circuitry you need to do.