There was a time not that long ago when every tool was cordless. But now, cordless power tools have proliferated to the point where the mere thought of using a plain old wrist-twisting screwdriver is enough to trigger a bout of sympathetic repetitive injury. And the only thing worse than that is to discover that the batteries for your tools are all dead.

As [Lance] from the “Sparks and Code” channel freely admits, the fact that his impressive collection of batteries is always dead is entirely his fault, and that’s what inspired his automatic battery charging robot. The design is pretty clever; depleted batteries go into a hopper, under which is a 3D-printed sled. Batteries drop down into the sled, which runs the battery out from under the hopper to the charging station, which is just the guts of an old manual charger attached to a lead screw to adjust the height of the charging terminals for different size batteries. When the battery is charged, the sled pushes it a little further into an outfeed hopper before going back to get another battery from the infeed side.

Of course, that all vastly understates the amount of work [Lance] had to put into this. He suffered through a lot of “integration hell” problems, like getting the charger properly connected to the Arduino running the automation. But with a lot of tweaking, he can now just dump in a bunch of depleted packs and let the battery bot handle everything. The video after the break shows all the gory details.

Of course, there’s another completely different and much simpler solution to the dead battery problem.

Historically, there have been a few cases of useful wireless power transmission over great distances, like a team at MIT that was able to light up a 60 W bulb at several meters, and of course Nikola Tesla had grand dreams of drawing energy from the atmosphere. But for most of us wireless power is limited to small, short-range devices like cellphone chargers. While it’s not a lot of work to plug in a phone when it needs a charge, even this small task can be automated.

This build begins with a 3D printed cradle for the smartphone to sit in. When the device detects that the phone has been placed in the cradle, it uses a linear actuator to drive a custom-built charging cable into the phone’s USB port. Similarly, when the phone is lifted from the cradle the cable is automatically removed. It appears that there is some play in the phone’s position that lets the charger be plugged in smoothly, and the project’s creator [Larpushka] points out that the linear actuator is not particularly strong so we don’t imagine the risk of damage is very high.

While wireless charging still may have the edge when it comes to keeping debris out of the port, we still really enjoy a project like this that seems to be done for its own sake. There are some improvements that [Larpushka] plans to make, but for now we’re delighted by this build. For anyone looking to add true wireless charging to any phone that doesn’t have it, though, it’s not too difficult to accomplish either.

Surely you need yet another way to charge your lithium batteries—perhaps you can sate your desperation with this programmable multi (or single) cell lithium charger shield for the Arduino<! Okay, so you’re not><em>hurting</em> for another method of juicing up your batteries. If you’re a regular around these parts of the interwebs, you’ll recall the <a href="http://hackaday.com/2014/09/21/a-li-ion-battery-charging-guide/">lithium charging guide</a> and that <a href="http://hackaday.com/2014/09/05/an-obsessively-thorough-battery-and-more-showdown/">rather incredible, near-encyclopedic rundown of both batteries and chargers</a>, which likely kept your charging needs under control.</p> <p>That said, this shield by Electro-Labs might be the perfect transition for the die-hard-’duino fanatic looking to migrate to tougher projects. The build features an LCD and four-button interface to fiddle with settings, and is based around an LT1510 constant current/constant voltage charger IC. You can find the schematic, bill of materials, code, and PCB design on the Electro-Labs webpage, as well as a brief rundown explaining how the circuit works. Still want to add on the design? Throw in <a href="http://hackaday.com/2014/07/16/finally-an-easy-to-make-holder-for-lithium-ion-batteries/">one of these Li-ion holders</a> for quick battery swapping action.</p> <p>[via <a href="http://embedded-lab.com/blog/?p=9644">Embedded Lab</a>]</p><br />Filed under: <a href="http://hackaday.com/category/arduino-hacks/">Arduino Hacks</a>, <a href="http://hackaday.com/category/microcontrollers/">Microcontrollers</a> <a><img src="http://feeds.wordpress.com/1.0/comments/hackadaycom.wordpress.com/138748/" /></a> <img src="http://pixel.wp.com/b.gif?host=hackaday.com&blog=4779443&post=138748&subd=hackadaycom&ref=&feed=1" />

Electric vehicle charging stations aren't cheap: one of the most affordable Level 2 (240V) units sells for $450 and only supplies 16A. Electric Motor Works (EMW) -- which is best known for its electric conversion kits -- wants to change this with JuiceBox, a 15kW Level 2 EV charger that costs just $99 in kit form (plus $10 shipping). The device, which is launching on Kickstarter today, supplies up to 62A and operates on both 120V and 240V. It's built around an Arduino microcontroller and EMW is making both the hardware and software open source.

But wait, there's more! The company is also crowdfunding a Premium Edition of JuiceBox ($199 in kit form) which adds time-of-day charging, a color LCD, ground-fault plus output protection (for outdoor use) and a unique enclosure (hopefully as funky as the one in the picture above). While the DIY kits only require basic assembly and soldering skills, you'll be able to buy fully assembled versions for $100 more. At $329 (shipped), a ready-to-use JuiceBox Premium Edition undercuts other similar charging stations by several hundred dollars. The catch? You'll have to supply your own cables (or buy them separately from EMW), including one with a standard J1772 EV connector. Hit the source link below to check out the campaign, and take a look at the PR after the break.

Filed under: Transportation

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Source: EMW (Kickstarter)