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New forum member N380 hub
Forum : New members (English)
Dernier message : Normand_Nadon
Aujourd’hui, 12:27 AM
» Réponses : 2
» Affichages : 15
Pedal load sensor/ power ...
Forum : Support and DIY (English)
Dernier message : Oran
10-12-2017, 09:25 AM
» Réponses : 6
» Affichages : 203
Attempt at cheap homemade...
Forum : Support and DIY (English)
Dernier message : Michael
10-08-2017, 06:22 PM
» Réponses : 66
» Affichages : 5 889

  Introduction & why I am here in this forum
Posté par : Michael - 11-02-2016, 09:12 PM - Forum : New members (English) - Réponses (2)

Gentlemen (Normand and Oran), today I joined your club (forum) because it looks like we might be 'the' only three visible persons in the internet/world trying to get an automatic seamless shifting solution for our bicycles done in combination with a Nuvinci hub (apart from Bosch and some other large companies that only want to build e-bikes meanwhile, but an e-bike is no option for me, I am still too young for such things, maybe later once I feel 'old' enough).
Since more than six years I was thinking about it once I heard about the Nuvinci hub. First I started to write an app for my Android phone, just to see if these motion sensors could bring me a benefit to go even further into a kind of predictive mode, when and how to shift. Once the app showed the first results I combined an Arduino with a Blue Tooth module and paired it to my phone, so speed data from the reed switch was processed within the Arduino and sent to my phone. Combining this with the motion sensor data from the phone would instruct the Arduino over Blue Tooth, what to do with a servo.
I came that far about three years ago, still without having bought a Nuvinci hub. Then I did not have enough time to go further and time passed.
But this changed this year, in summer I got a new N380, and bought a used N360 with the Harmony (servo Hi8) from ebay. My first intention was to control the Harmony servo via an Arduino via Blue Tooth by my phone. But then I had to learn that with mounting the Harmony servo to my very old, but also very reliable bike (Kuwahara), I would lose my chain tensioner due to less space left by the Harmony servo. I would have to cut the part of the frame away where the chain tensioner is mounted. And that's where I said stop. Once cut off, there would not be an easy way back to get the chain tensioner refitted and even if the transmission ration of the N380 is fully OK, I still like the idea having the chance to shift between the three still existing front sprockets to gain an even bigger transmisson ratio for rare extreme situations, but this will only work if I will keep the chain tensioner. So the Harmony servo was now pushed back, at least for a while. Originally I wanted to go for the h-Sync version of the Harmony servo anyway to utilise the CAN bus via an Arduino.
So now you may be able to understand where I want to go, and that's when I found you two guys doing it without the Harmony servo and I have to admit well done gentlemen!
Guess what I did the last days ... taking your idea using a RC car servo controlling the wires put into a kind of a box at a differnt place so that the chain tensioner can stay where it is, at least for the next development steps. Latest at this weekend I should be able to do the first test drives. Thanks to your pre-work!

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  Économie d'énergie 101 !
Posté par : Normand_Nadon - 10-15-2016, 10:16 PM - Forum : Une Maison verte - Pas de réponse

Voici une petite (bon... très longue!) vidéo qui parle d'économie d'énergie domestique!

C'est un ramassis de connaissance que j'ai accumulé au fil des ans et des projets...

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  5 years of NuVinci hubs
Posté par : Oran - 09-11-2016, 02:07 PM - Forum : General Discussions (English) - Pas de réponse

Its been 5 years since I got my very first NuVinci N360. In that time I don't think there's been many weeks when I haven't used one, most weeks its every day. My mileage isn't that impressive 11-12k miles but I've lived a lot of the time on an island with only 15 miles of roads. I've owned 6 hubs in total, the latest an N380.

They haven't been without issues, worn out stators, traction fluid leaks and a freewheel that made a snapping noise. Despite this they have all been 100% reliable out on the road. A few snapped gear cable's doesn't really count.

There's no doubt that these hubs are a little less efficient than derailleur gears but I gain a little fitness to compensate. They have their purpose on certain bikes, I wouldn't want one on all of my bikes/ trike. Its like a full suspension mountain bike with fat tyres is less efficient than a road bike but is so much better off-road. A NuVinci hub is less efficient than derailleur gears but it preforms so much better in the town/city environment.

In conclusion I think NuVinci CVTs really are the future of transmissions in a lot of applications. Will I still be using one in 5 years time, I'm pretty sure I will be.

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