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  1. B

    Charging a tablet externally

    Rather than spend the $60 on a charging board for my Motorola XyBoard (xoom 2), I would like to charge the tablet with an external lithium charger http://goo.gl/N83DfW Also, the module has an adjustable amperage setting, but I cant figure out what the chinese picture means on the listing other...
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    Stepper motor controller

    I have a few stepper motors laying around, all are 6 wire(bipolar?) and would like to build a wire stripping machine powered by one. Anyone have a recommendation on a controller that can do variable speed? I'm trying to do this on the cheap.
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    Homemade Bluetooth speaker

    I picked up 5 - 8 ohm speakers from a garage sale yesterday and came up with an idea.. It's taken me many hours, but I managed to throw together a bluetooth speaker. I had a DIY 2x15 watt amp kit ( http://goo.gl/KMAL1Z ) that was put on the back burner, a bluetooth receiver and a pile of Elite...
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    DIY Shunt

    I had a Powerizer smart charger http://goo.gl/QZPavz that I wanted a voltage and amperage readout on. So I installed a cheap combo meter http://goo.gl/gVTYq7 on it. Somewhere down the road, I lost the original shunt for it. Not that I could ram something that large inside the case. So I'm...
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    Hot Lifepo4 after ride

    I put 30 miles on my lifepo4 48v 20ah yesterday and when I checked my pack, it was pretty hot.. I let em cool down for about 2 hours before putting a charge on em. I'm just wondering if that's normal. I've never put that many hard miles on them before(big steep hills). And on a side note, I...
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    GPS overlay on video

    I've seen a few videos on youtube, where they have overlayed GPS data in the form of speedometers, elevation and direction on their video. Does anyone have any recommendations for an android app that can record and export this data so I can drop it on my videos?
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    Thumb throttle pinout

    I just purchased a thumb control from http://california-ebike.com/ for my papa motors controller and was wondering what the controller pinout is. I'm guessing that red is +5v, black is - and white is the variance voltage. I have a pinout for the controller, but I would hate to fry the throttle...
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    I got run over

    Yesterday, I was on my way to work and was cruising up the bike path, when a pathfinder decided to change lanes, knocked me down and drug me up the road between 30-40 feet. I'm okay except for the road rash on my left side and I feel like a mac truck chewed me up and spit me out this morning...
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    Ebike update

    It's been a while since I have shared anything about my bike build... It's around 2 years old now since I first purchased a Papa Motors 48v 15ah kit for around $1200. Since then, the Ping battery died because of faulty BMS(s). So I purchased a bioenno power batter (48v 20ah). The BMS that came...
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    Wire size

    I have a 9" run from my battery to a plug and was wondering if 18ga wire would fit the bill. I ran a few online calculators with mixed results. The BMS has a max 35amp output @ 60v. This is one corner that I dont want to cut. Thanks for any info on my newb question. -Mike
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    Battery amp-hour, watt-hour and C rating tutorial

    I ran across a new youtube video from Afrotechmods, who explains the difference in Ah, Wh and C ratings. Pretty informative video: cxkVxi9P0EA https://www.youtube.com/watch?v=cxkVxi9P0EA
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    Jump starting a car

    I have a 48v 16c 20ah pack for my Bike and tried to start a car with a few cells.. Their battery that read -8v, so I pulled their terminals and connected to a few of my cells for 13.7v. I could run their lights and hear the starter clicking, so I figured there was a bad connection because of the...
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    Disc Upgrade

    Since my bike is 80 pounds and I'm over 200 and I have to stop from time to time, my disc's are paying the price. They turn smoking hot colors, warp in odd ways and wear my pads out frequently (every 3 weeks for pads and 2 months for discs), I need to go bigger. I currently have Dart 3's...
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    Ebike ski machine

    My friend were snowed in at my place last weekend, so I decided to throw a ski on the front of my bike and test it out. I put a few zip ties around the rear tire and that gave me great traction. Unfortunately, the thing did not steer very well. The next step would have been to place slats or...
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    Ready for Gears

    I'm ready to ditch my direct drive hub for a geared hub, but I'm not sure what I'll need to pull me up 10% grades(or greater). My current setup is sold by Papa Motors http://goo.gl/bDZw7Q As it stands now, I can get a 30 mph run at one hill and have to peddle like crazy about 3/4 of the way up...
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    Bioenno Power LiFePO4

    I received my 48v 20ah battery from Bioenno power yesterday. I noticed that they are not mentioned that much on this board, so I figured I would throw some thoughts out there. The BMS is hidden inside the packaging, which is good and bad. You are stuck with the tall configuration, unless you...
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    LiFePO4 48v 15ah BMS issues

    I had my battery for about 2 months and then the first LED would stay on all the time. They sent me a new BMS, I installed it and after a few days, the pack was back to normal. But a week or two later, the first 2 lights would stay on. I'm talking to PING's customer service, trying to figure...
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