Recent content by jamesv

Thanks gwhy I never thought of doing it like that! I'll test it tonight when I get home. Dave I see what you're saying, that does concern me but as I have gears on the bike I'm normally at pretty much full throttle and I just vary speed with the gears mainly. First gear is about 15 mph and top...

Thanks guys, and gwhy I really do appreciate your help, this bike wouldn't have stood a chance otherwise! Here's my code it's probably dreadful but what do you think? #include <PID_v1.h> //Define Variables we'll be connecting to double Setpoint, Input, Output; //Define the aggressive Tuning...

Hi guys I've recent brought an Arduino to try and make a current limiter for my electric bike that uses an RC ESC. I plan on using PID to create a current limit but I am unsure of what values of kp ki and kd to use with my RC ESC, does anyone have any rough ideas? Thanks James

It's hard to look at the watt meter while I'm at full speed but from glancing down it is not drawing more than 30ish amps at constant speed, I hit a recorded 34.8 mph tonight. At the moment I cannot change beyond gear 4 because of clearance issues but I'll get that sorted on the weekend for a...

Hi mate, I'm kinda shocked didn't expect to see anyone from Guernsey on here! But yeah I'm in Guernsey :D I'll get some pictures uploaded soon I'm busy with my Uni application tonight.

Hi guys, I have just got the electric bike working after panning it for quite some time. At the moment I am using 3 12v 12ah batteries that I got for free from the recycling centre, they are not the best but OK to get everything else sorted. Thanks to the guys off here who answered all my...

Thanks gwhy just wanted to make sure that would not weaken the shaft too much. I will go for just the one 5mm grub screw. Thanks James

Hi guys I have another question, I am going to be using a C80100 motor with a 12mm shaft, my question is how do I go about securing the sprocket on the shaft, I will be using around 4KW. I am hoping to use a 9 tooth sprocket from technobots...

Thanks for the reply fechter it has helped allot, and thanks for designing that circuit! I am aiming to just use the limiter as a safety device to stop the controller frying itself I think I will keep it like the first design as to reduce the 'overshoot' you mentioned. From your vast amount of...

Thanks for finding that John hopefully he will come across this and be able to give me a hand. I get the general idea of how it works but don't completely understand it which is why I am having trouble working out how to make it work for my set up. Did you end up using it? I haven't found...

Hi Guys, I've finally decided to go for my electric bike build for a school project as I can use the workshop tools. My setup will be an alien C80100 rewound to 40kv, a turnigy dlux 160 amp HV ESC driving the freewheel cranks. I know my main problem is going to be limiting the current as the RC...

That's impressive I didn't think that was achievable the speed limit here is max 35 so that would be amazing! I really wanted to avoid hell sensors as they seem complicated to a newbie! I plan on still using the gears on the rear cassette so in '1st' gear it would have a max speed of 9mph, I was...

OK thanks I have just welded a plate onto the 80 tooth and drilled a 10mm hole its good but definitely not perfect so it looks like I will be going with the 76T technobots sprocket as well but it will work OK for testing. I plan on using the 190A Hobby King SS speed control...

Thanks that has cleared things up a lot. As the bike will soon have to be my main mode of transport to school and back I'm thinking of going with the larger motor (http://www.giantshark.co.uk/c808508-kv170-p-407469.html) and hopefully this will make it much more reliable as I will be running it...

Hi, thanks for the welcome :D That site is perfect! I live in Guernsey, but that shouldn't be a problem even if they will not send it direct as I have relatives in the UK who would send it to me. The 80 tooth is from a Chinese electric scooter so I'm not sure I have always believed it was just...