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Here's some progress info on the second build I am currently working on. In this version, both derailleurs will have the same Pololu 3452 motor and the same type of shaft. The control unit and the battery will be mounted inside the frame.
Here's some progress info on the second build I am currently working on. In this version, both derailleurs will have the same Pololu 3452 motor and the same type of shaft. The control unit and the battery will be mounted inside the frame.
Last update: Dec 23rd 2017.
Last update: Dec 23rd 2017.
Rear and front derailleur shafts. The bearings are SKF 625ZZ's.
Shaft diameter is 6mm with 4mm lead.
POLOLU-3452, 225 rpm Gear motor.
Rear motor bracket
Milling the front motor bracket on a DIY CNC.
Control unit modules:
Arduino Pro Mini 5V
Pololu S7V7F5 Regulator
Pololu S7V8A Adjustable Regulator
2 x Pololu MAX14870 Motor Controller
3503 Linear Hall sensor and 4 pcs 2x5mm disc magnets glued into the front derailleur.
7.4V 1400mAh battery. This fits nicely inside the bike frame.
Front derailleur almost ready.
Rear actuator
A pile of magnets for position detection.
Hall sensor glued in place.
Against all recommendations a 3mm cable hole was drilled to the carbon frame.
Derailleurs installed for calibration and testing.
Battery was fitted inside the seat post. Main power switch and charging connector are accessible under the seat.
SRAM S500 levers waiting for installation of switches.
Waterproof tactile buttons installed. They are moulded into polymorph plastic, painted and then glued to the levers with epoxy.
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