Thanks to all who responded. I'm at work, and just trying to squeeze in here.
Reason for starter motor? It's available.
Yes, they generally are easily available, but it doesn't mean it's much good for anything else.
Ford starter, Pic 16f84, also available.
Do you mean you already have a pile of them?, because the 16F628 is just as available (if not more so), and costs less money.
Actual distance would be 2.5 miles one way.
Battery to be recharged by windmill when parked at home.
Will be used everyday. Hoping it recharges at night.(will have plug in socket in case of no wind).
During the day(at work). small solar panel to maintain battery.
MY brother built one, but motors not lasting because of full on mode.( just a switch).
No, it's because it's not designed to run for more than a few seconds a few times a day. unning it slower with PWM won't extend it's life, it may even shorten it due to over heating?.
I'm trying to eliminate the cost of fuel and vehicle registration ect... And no, not interested in a pedal bike.( I tried that)(wildlife could outrun me)(bears ,coyotes ect...)
What is the legal postion where you are?, in the UK you would probably be subject to some kind of legal restrictions (everything is!).
Why not buy a moped?, 100 miles per gallon, cheap registration and insurance, and it will leave a starter motor standing!.
Also the choice of motor is because of tremendous amount of power available.
But it's only designed for very short term use, and is VERY inefficient for anything other than a starter motor!.
Nigel, if I use this chip(16f84), A look up table for pwm, and one for variable position switch, would that work? Or should I just go with chip you use on your tutorials, with variable resistor/potentiometer for speed control?