barden said:
Hello everybody,
To start A big thank you for developing all these wonderful tools around the TSDZ2, starting at casainho.
Please excuse my poor basic English (thanks google translate)
My name is Denis and I live in the French Alps, near Lake Geneva
I am paraplegic and I use a handbike (handcycle).
So I have on the roads and paths that I practice (I like to walk on unpaved paths) steep slopes, and steep descents, hence the interest of a mid-drive motor. And I need good brakes, I have a pad brake (V-Brake), but I plan to put a nexus (with maybe the double pinion as did brilliantly jeff.rides) with a brake drum brake second (roller brake or coaster brake, I talk about it later) And I had a BBS on another handbike, which works very well, but I like the idea of a torque sensor with an engine that helps in proportion to the effort, to play sports as much as I can while being disabled.
Please excuse me for this long introduction, but necessary for you to understand my context of practice and my needs.
I read with interest in particular the interventions of jeff.rides, which I contacted by private email. He encouraged me to post on the forum, even if Jeff has already answered my questions well, but I have new ones (smiles).
It is really important to keep the information public / open so you can inspire others in your situation!!
Jeff seems very experienced and lucky he shared some good videos about his build.
barden said:
But it seems that another advantage of the coaster brake is to be able to apply a negative torque when starting the engine, which facilitates the help of the engine (I have much less force in the arms than a valid one in the legs well sure). So I'm a little lost, should I take a coaster brake or a roller brake?
This is something I think Jeff didn´t understand yet, maybe because he could not play with the most recent version of the firmware that has high sensitivity on the torque sensor and full calibration, unlike older versions of the firmware and other forks.
On this firmware, you can make the motor start running with a value lower than 1kg of weight / force on the torque sensor, which is almost nothing and I am pretty sure more than enough for users like you!!
Please follow the torque sensor calibration wiki page and then discover by yourself what the sensor can detect, you will be amazed. You will see on the display the weight / force in KGs you are doing on the pedals and then you can choose the multiplication factor on assist level to produce the motor current / torque.
barden said:
Then I would prefer a 48V, but it seems that if I have to choose a coaster brake, it only exists in 36V. What is it exactly about this? it seems that the 48V has more torque than the 36V, is it true?
Read the wiki FAQ. Also, seems that 48V can hold for more time the motor high current, meaning you can pull the max power for longer time.
barden said:
Regarding the screen, I'm also lost there ... Jeff.rides has long used an LCD3 screen, with developments by mbuba, but this branch seems to have stopped. What about the coaster brake and the P850C screen? is it compatible?
For display, the best is the 860C -- but see the comparison table on the wiki.
The coaster brake version, while I don't have one to test, I am using the same code as Buba and other users with a coast brake are helping to test the code.
barden said:
I would prefer to have a stable version, with an engine that stops when we stop pedaling, a controller that does not catch fire (laughs) ... it seems that the versions in development are not yet completely stabilized (P850C )
I am active developing the firmware and sometimes there are issues but you can count with the best possible firmware, on for you case I think the best one because has high torque sensor sensitivity and full calibration.
barden said:
To buy, from France, tips to give me? there seem to be big price differences (aliexpress, electrifybike), are they justified?
I would expect support from electrifybike and none from aliexpress sellers, like PSWPower. Look also at PSWPower as they can sell from inside EU, so no extra taxes on customs.