>many consumers were frustrated when they tried to charge their portable devices in cars.
Well, it depends on how long you're in the car, doesn't it? If you take a 15 minute drive and you start with your phone at 20%, do you expect 100% in 15 minutes? Wou wonlt get that from a home charger. For less than about $15, you can get a dual charger that plugs into a cigarette lighter. I have a dual charger. Unless you're on a 2-hour drive, don't expect your phone to be fully charged.
I would assume that with smoking on the decline (it is isn't it?) that more manufacturers would simply put usb chargers in the place of the lighter. Hell, even if smoking isn't on the decline, energy sucking devices are obviously on the rise.
>more manufacturers would simply put usb chargers in the place of the lighter.
Don't take away my cigarette lighter socket even though I have never smoked and never will. Why, because what if you need to power something besides a phone charger? For example, my GPS plugs directly into the lighter socket. Now true, the other end of the cable is a mini-USB so I could use a mini-USB cable plugged into a USB socket, if my cars had them.
But speaking of mini-USB cables (see my post immediately below), did you know that they have five connections, not four? The fifth is for a pull-up resistor that lets the cable charge some devices. My daughter's MP3 player was one of those. The cable that came with it would only charge the player when connected to a computer USB port but not to a charger. Pin 4 needs a pull-up resistor so the charger knows there's something connected to it. PCB USB ports don't have that.
I have a blog about this that I can post here on request.
One advantage of the USB is it's smaller, taking up less dashboard space. But, you really need two or more, thereby killing any space savings. USB might cost more because it needs a DC/DC converter to get down to 5V. The cig lighter socket is just the 12V from the vehicle's electrical system and is thus more universal.
Well... I'dd really like USB charging ports to be integrated on the dashboard, at least two USB ports, but I would not give up the ciggarete lighter plug...
I use it for my mini air compressor, in case the pressure in my tires needs adjusting, and for small cool box I sometimes take with me to picknicks or trips...
There are a lot of other devices that need 12V, and up to now I haven't seen any other conector in car to supply it (and with 10 or so amps).
But I would do one thing... I would replace it with someting more compact. Actualy none of my friends that smoke, use the cigarette lighter in the car.... they use the connector for chargers, SAT-nav and other gadgets...
The Iphone charging issue referred to is (I believe) due to the conventional USB charging current being limited to 0.5A. Most smartphones (Iphone and HTC, Samsung etc) require something nearer to 1A to provide both device operating power and battery charging power simultaneously, especially when running apps in the car like navigation.
Some devices can be pursuaded to draw more than the maximum 0.5A by connecting the D+/D- lines together in the USB charging lead. This works on my HTC smartphone and enables me to use navigation apps on long journeys whilst charging the phone battery to 100%.. You do need to check that the car charger/USB adapter can supply the current needed first tho! Many of them are marked as rated up to 1A but will run very hot at this type of current level...
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.