Shimano's Di2 Canbus protocol - advances on hacking it?

Discuss light weight issues concerning road bikes & parts.
kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

This shit is not hard. I guarantee it's a variation on a standard digital communication interface. Someone send me a $2000 UI2 gruppo and I'll detail it for you in a couple of weeks.

freeloader
Posts: 46
Joined: Mon Dec 31, 2012 5:27 am

by freeloader

kulivontot wrote:Someone send me a $2000 UI2 gruppo


The probability of that happening is not very high.

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

No shit, but a bunch of hemming and hawing about why it hasn't been done before isn't likely to document the interface either.

drmutley
Posts: 344
Joined: Fri Feb 11, 2011 4:23 am

by drmutley

kulivontot wrote:This shit is not hard. I guarantee it's a variation on a standard digital communication interface. Someone send me a $2000 UI2 gruppo and I'll detail it for you in a couple of weeks.


kulivontot wrote:No shit, but a bunch of hemming and hawing about why it hasn't been done before isn't likely to document the interface either.


Nothing useful to add except telling how good u are? Do u fix aircraft as well? Move along....

egebhardt
Posts: 31
Joined: Wed Mar 19, 2008 8:38 pm

by egebhardt

Here's a battery hack you've probably seen already:

Buy a used SM-BMR1 or 2 (they are the same) for ~$25. Update the firmware, or not.
Get a teeny allen and remove the chip in the base. Those posts are + and -. The tapered side is +.
Solder a wire with a JST (japanese standard terminal) connector.
Buy cheap 7.4v Lipo (2 cell) batteries on Ebay for $6.
For $31, you have a Di2 battery.

Note: BMR1 and 2 do not support BlueTooth wireless configuration.
Eric in San Carlos, CA

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