Well, hi, sci.electronics.design.
I haven't been by in a while.
Work on the MOEPED continues. What's a MOEPED?
It needs an encoder. Here in s.e.d., an "encoder" search returns:
but I need a funny, different encoder. I've thought of building a diode matrix.
Available encoders:
7 positions, switching a bank OFF in position 1 through a separate relay and line, and switching
12 power bank components (2700 F, 2.5 V ultracapacitors) series or parallel as needed to provide
1x12, 2x6, 3x4, 4x3, 6x2, and 12x1 configurations, for dynamic braking and throttle control.
I'll be using relay:
most likely.
Encoder output is something like:
0000000000000 and power off condition is this as well.
1000001000000
1000100010000
1001001001000
1010101010100
1111111111111
I have to draw a schematic to get this right....I have already made some relay PCBs. They aren't soldered or mounted.
It also would help if it were operated by a bicycle cable!
There are 7-position bike shifters available that could provide a basis for switch increment spacing. A machined drum of the right radius would control a rotary switch nicely, since it is unlikely for a linear switch to have the right spacing. I can do the mechanicals and a diode matrix, so I may get by with an existing 12 position switch, a drum, a return spring for the cable, and a matrix, but I'd like to see if there are such encoders on market before doing a one-off.
Some combination of linear throw potentiometer, linear LED display driver IC, and diode bridge or burnable array of some kind might do a nicely generalizable solution that other EV hackers could use.
Where do I find such a "hen's tooth?"
I have a NI USB-6008 and Compaq TC1100 for later use as an automatic controller but I need a robust, near-zero-power manual control first!
Doug Goncz Replikon Research Seven Corners, VA 22044-0394