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PS the hall sensor I use takes hardly any power at all. My multimeter cant even detect it because its so low.

I made a new design that uses a 4093 NAND gate IC and a 4013 D-Type flipflop IC. These uses tiny amounts of power. You still need an electromagnet as a reed switch or relay doesnt generate a big enough field. I've refined my electromagnet design by using a thinner wire (0.15mm) and making more...

400 - 500 quid is about what id expect to pay tbh. I've not been particularly good to mine. But considering the price of cells 700 quid is a complete rip off.

Ah I just saw the ebay, I assumed it was a no brand one. Looks like they've custom built that themselves. Must be using their own BMS. Makes sense really.

Cheers. Bloody hell thats expensive! I wonder how many cells are inside it.

I have a HaiBike AllMtn SL which uses the Yamaha system. I've run it ragged commuting to work every day and the battery is starting to degrade. I thought Pah! ill just buy a new battery...Then I found out there is literally nowhere online I can buy one from! Is anyone else in the same boat? Does...

Ps. Ill be adding my new design soon which uses a dual flipflop. Ill post schematics here. Ive also been working on a 3d printed case for it which houses all the components and also a 500mah lipo battery thats rechargable through USB. More info to come soon!

If you create a parallel circuit off your hall effect sensor and invert the signal so that high is in and low is off you can then feed that into an AND gate. So you have this hall output plus the flipfip output and when both are on the and gate output will be high which feeds into a transistor...

Go into the settings and change its wheel size to the lowest setting. I believe these bikes dont use a magnet sensor as its built into the hub. So changing the wheel size to a small value should give you some more speed.

So to anyone who's interested I swapped the arduino out for a 2 bit D type flip flop, it consumed hardly any power and works a treat.

True but an npn2222 is cheap! Its essentially doing the same thing as a 5v relay would do is it not? (Ive recently returned to electronics btw so im nowhere near a pro, my background is programming) Im doing some experiments and I think I could even power the arduino with a single 18650 esp if...

True the batteries can be a pain but since its now running from 2x18650s it lasts a loooong time. Im going to experiment how much current I need to pass through the coil before the bike sensor doesnt pick it up anymore. At least then I can put in some resistors and save some power.

Correction the lower the value the resistor the higher the current. I actually dont have a resistor between my AA and my electromagnet. Ill upload a video soon with a parts list. I had fun building it, seems reliable too.

I made one using and inch long steel bolt wrapped around with 0.3mm of enameled copper wire. It seems like the magnet sensor is quite sensitive so a solenoid could work fine. I just found it cheaper to make my own magnets. I experimented with different numbers of coils but in the end I just...

So I upgraded this a bit. Its now powered by 2 18650 lithium polymer cells, which means the battery wont run out for a LONG time. I've also added an RF transciever in the unit so that I can transmit the speed to my own LCD screen located on the handle bar. This is also powered by an arduino...

These are built into the Arduino board which is pretty handy. You can buy the boards from anything from £5 up to £15 for the micro version. The great thing is its open hardware so you could even make them yourself. I cant really test the hub sensor sadly as I no longer have a hub driven motor...

I tested it on a flat piece of "private" land today and I got up to 27mph quite easily before running out of room. I think on a road with some decent hybrid tyres you could get up to 30 and sustain it.

Hi, i'm using a yamaha motor. The reason i dont put it on the cranks is that using this method all I have to do is just double the read out speed and I know how fast im going. Also it means im not modifying my bike in any way other than moving the magnet up the spoke slightly I'm going to...

I know im a bit late to the scene here but having my ebike has literally changed my life. Since owning it i've lost a ton of weight as it allows me to do the exercise I love without worrying about my knee that got injured when I was serving in the RAF. It literally makes cycling an absolute...

As most of you are quite aware theres a speed limit in the UK of 15.5mph for electric bikes, which makes sense for public roads etc (not really). But what about when you're on your own private land and you want to get more out of the bike... Yeah theres lots of different dongles you could...