Search found 103 matches

by bobc
Mon Nov 25, 2013 1:06 pm
Forum: Events
Topic: Greenpower Finals , Goodwood, Sunday 14 October 2012
Replies: 9
Views: 18983

Re: Greenpower Finals , Goodwood, Sunday 14 October 2012

quick report on the day (now over a month ago). We came 2nd in both races, and we were out of the main race for 23 minutes with electrical problems due to the continuous heavy rain. So, pretty good day (i.e. could do better...!!!.). Main race was won by Rotary Racer for the 3rd year on the trot. In ...
by bobc
Mon Sep 30, 2013 10:17 am
Forum: Events
Topic: Greenpower Finals , Goodwood, Sunday 14 October 2012
Replies: 9
Views: 18983

Re: Greenpower Finals , Goodwood, Sunday 14 October 2012

Just a 'bump' to note that this year's finals are approaching on Sunday October 13th. My team have got back to the sharp end in both races on the day (Look out for Dougal vs Jet in the first race and Dougal vs Rotary Racer in the 2nd). Looking forward to another good day out! (actually it's more tha...
by bobc
Mon Apr 22, 2013 12:29 pm
Forum: Electrically assisted bikes
Topic: EU "legaliser" for an RC motorised ebike
Replies: 4
Views: 12981

Re: EU "legaliser" for an RC motorised ebike

Bit of an update: programming solution here & working; Hardware (mostly) in place to motorise my trike. Only lack of time + inherent laziness holding me back........ http://i543.photobucket.com/albums/gg471/bobc0/trike/trikedrive2_zpsdf8d39f7.jpg http://i543.photobucket.com/albums/gg471/bobc0/tr...
by bobc
Mon Apr 08, 2013 10:59 am
Forum: Home Energy Area
Topic: 24V lead acid battery charger with maximum power point track
Replies: 3
Views: 12862

Re: 24V lead acid battery charger with maximum power point t

Oversampling the ADCs let me increase the resolution & has improved low light performance no end. The incremental conductance method was a non- starter on this board with 8bit ADCs. I now have a complete tool chain from "C" source to programming the PCBs at home so am progressing again...
by bobc
Wed Mar 06, 2013 9:47 pm
Forum: Home Energy Area
Topic: 24V lead acid battery charger with maximum power point track
Replies: 3
Views: 12862

Re: 24V lead acid battery charger with maximum power point t

Boards are back, no. 1 built up & experiments ongoing: I'm looking at the effects of search step size, step rate etc. a various insolation levels. It looks as though a simple adaptive search step size is appropriate, with larger voltage search steps at lower light levels (i.e. lower array curren...
by bobc
Wed Mar 06, 2013 9:34 pm
Forum: Electrically assisted bikes
Topic: EU "legaliser" for an RC motorised ebike
Replies: 4
Views: 12981

Re: EU "legaliser" for an RC motorised ebike

PCBs arrived last week - now built up. Just waiting for a programming adapter to arrive from hongkong ;^) programming adapter finally here - wow that took a while! I Also needed to make an extra bodge board on the programmer to allow 1) use of tiny10 micro and 2) use of reset pin for purposes other ...
by bobc
Wed Feb 13, 2013 10:36 pm
Forum: Electrically assisted bikes
Topic: EU "legaliser" for an RC motorised ebike
Replies: 4
Views: 12981

Re: EU "legaliser" for an RC motorised ebike

Thought I'd add a bit more info to this; the reason I did the circuit was for an electric assisted pedal trike. I work with a school "greenpower challenge" team. Our car goes over 120 miles in a 4hr race on just 20p worth of electricity. I want that performance in my commuting vehicle. And...
by bobc
Wed Feb 13, 2013 9:58 pm
Forum: Home Energy Area
Topic: 24V lead acid battery charger with maximum power point track
Replies: 3
Views: 12862

24V lead acid battery charger with maximum power point track

Just a quick note about a project I'm working on; it's a solar charger for a 24V lead acid battery. It's a small (and I mean small - 25mmx40mm) PCB which runs from a 20V PV array - the sort you'd use to charge a 12V battery with a shunt regulator. To do the maximum power point thing, it has a AVR AT...
by bobc
Wed Jan 30, 2013 1:16 pm
Forum: Electrically assisted bikes
Topic: EU "legaliser" for an RC motorised ebike
Replies: 4
Views: 12981

EU "legaliser" for an RC motorised ebike

My ebike, (it's done several thousand miles now), uses a brushless outrunner and ESC from the model plane world an a small circuit to translate the output from a hall effect throttle to drive the ESC. This works fine but it's hard to drive (throttle way too twitchy) and technically illegal (it can d...
by bobc
Mon Oct 17, 2011 2:41 pm
Forum: Events
Topic: Greenpower at Goodwood
Replies: 11
Views: 18013

Re: Greenpower at Goodwood

enjoyed a cracking day at Goodwood yesterday. We got 3rd in the 1st race and 5th in the 2nd with our car Zebedee - which is about as good as we could hope. Both races were won by a substantial margin, by "Iwhoosh" in the first race, and by "Rotary Racer" in the 2nd. So we're no l...

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