Hi there,

I created a github repository and uploaded all documentation and installation files here:

https://github.com/vanvuongngo/Shift4Me

Feel free to create new "Pull requests", issues and comments.

best regards
asialife

Hi Jan

Very nice implementation.
Thanks for making it open source!

Now that it is "stable" please have a look at:
www.rideshimano.com/global/en/Shimano-Di2-the-intelligent-drivetrain/

Regards

Just add a speed sensor - reed contact and a magnet - to the setup to detect if the bike is moving. This could be used to detect downhill without pedalling or rolling towards a traffic light or standing... Would be only a few lines of code. Store actual speed, compare newe speed. Speed same or increased -> downhill, same or lower -> rolling towards a light. No crank, no speed -> standing.
Also, possibly decouple servo and actual pull at the bowden. Servos don't like constant pressure pull.

Hi Jan,

very interesting project I found today in the German "Heise-online" article and congratulations for this great idea and the complete instructionss and more...

Since I´m also doing some Arduino programming and 3D printing I have read everything to understand in detail what is done here. :-)
Currently I do not have abike but waiting for my dream bike is back in production. Seems that a lot of parts from China are missing and production in Germany is on hold.

However I developed an Arduino Mini based anti-thief alarm circuit with 105dB sirene based on a acceleration sensor.

And here comes my idea for an improvement of your electronic design. I used a LiOn single cell 18650 (3450mA), a DC StepUp converter (3A) and a LiOn charge / protect module.

The cell has a an output of 3.7 - 4.2V nominale and can be discharged until 2.9 safely. The output voltage can be adjusted via the DC Buck-converter to 6V for the Arduino and servo. So there is no need for 2 batteries. Additionlly I would not use NiMH cells due there is still a little memory effect but also I would say that your charging concept with 2 cells packets in row with different voltages and different discharge current is not very healthy for them. All cells placed in row should have the same dischrage level before charging them.

Here I have attached some links to cells and the modules. maybe you think about this for a future design.

https://www.conrad.de/de/p/samsung-inr18...99572.html

https://www.amazon.de/Lademodul-Schutz-A...B07FB6PLKM

https://www.amazon.de/LAOMAO-Step-up-Con...MDQQ6DHNE8

https://www.conrad.de/de/p/panasonic-ncr...36402.html

Hi. When I push the button and release it after the first beep, that puts it in bypass mode, am I right?
What I was wondering: when I'm in this mode and I push the button again, I don't hear it beep. Is this normal behaviour?

Hi, 
Could someone share the scripts, please? As there isn't scripts in downloads or maybe I miss the link.

So I've build the Shift4Me. It's great! It really is a great tool - my gears are shifting automatically and the result to me (riding comfort) is very noticable. I get to my destination with more easy than before.
But I have a situation: after some time (it happens mostly aften a 10km ride) suddenly the servo moto is acting up: it is moving back and forth randomly. My battery indication is not flashing (so battery should be fine).
Anyone have any idea of might be causing this??

When the problem occurs: then i turn the power off, wait two minutes, everything is back in 100% working order. Then again after 5-10kms, the problem re-occurs...

Love the idea. Would it be possible to post some clear close-up pics of the installation on a bike and of the 3D-printed parts? This would be helpful for people (like me) who are not sure if the kit would adapt to their bike.

Thanks in advance,
Clemens

Shift4Me is an open-source project. That means it is completely free. The download section contains all the files (schematic, Arduino scripts, 3D-printfiles...) that you need to start building your Shift4Me.

BUT: only registered users of this Forum can have access. The Download section is hidden if you're not registered. 
So just hit the Register link op the top of this page, sign up, and you'll have access.

First of all: keep it nice... Be respectful, polite and such. 
Try to post your thread in the appropriate sections. 

Before posting questions, consult the technical docs as manuals and other user's experiences.
Have fun!