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    thefabus' smart F-Bike Build Thread

    Hey endless sphere. I've been planning to build an electric bike for quite some time now. With all sorts of ideas creeping into the project scope and some failed ideas I never got around to make substantial progress, however in the last days I've picked that project back up to actually produce...
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    From 6S to 8S (ESC)

    I don't believe connecting 36V to GND will enable some sort of 'higher voltage mode'. The input voltage can be sensed quite easily by the circuit at the battery connection. If they say it can be used with 8S why don't believe them and try if it works?
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    Replacing freewheel... double washers?

    I first wanted to create a thread but no need if there's one already about this. A while ago I screwed on a random freewheel on my QS 205 just for the hell of it to go for a ride. After that I wanted to take it back off, only to realize that my freewheel removal tool did not fit. Well f***...
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    Overvolting a 48V eBike controller

    That won't work because the fets need some margin to the battery voltage because during switching the voltage can actually be much higher at the fets. There would be other things as well like voltage dividers for voltage sensing. So I agree, just buy a 72v one and you're fine.
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    Kelly, CANBUS and Arduino

    CAN bus is better suited for automotive applications because it has higher resistance to noise (even though rs232 should work fine too). If you want to use it, you can either use an arduino shield (i think the due is the only one supporting CAN) or you could use a breakout board like...
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    How to " step down " 72 volt battery to 18 volt for accessory tire pump

    18v-20v is not that common. Maybe 24V would work too? Otherwise, step down to 24 and then again to 18. DCDCs in the lower voltage range that can handle a few amps are quite cheap.
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    kWeld - "Next level" DIY battery spot welder

    Really impressive work! The website says all units are sold out... Do you know when new ones will be available for purchase? Looking forward to buy one. Also, it would be really cool if the welder would send out the measured data over a serial port after each weld. That way one could plot it...
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