My first project will be …
small 2 wheeled, differential drive, robot car
a third wheel (ball caster) for balance
It will just roam around the house for 15 to 30 minutes and then park for a recharge.
Controlled by a Raspberry Pi and a RoboClaw
3" diameter wheels
My approach to pick an RPM was to walk 15 feet at a speed that I thought was OK for the car.
That took 7 seconds and about 19 revolutions of the wheel.
That equates to about 163 RPM.
My thought is to pick something like this: 140 rpm 12v 20 mm diameter metal gear motor:
Question #1: Because it is a 12v motor, is it appropriate to connect 2 of these 6.0 V NiMH Battery Pack in series:
Question #2: The motor mentioned above has a 12v stall current of 1.6 amps. With two motors, does that mean I ideally need 3.2amps to run for an hour which would mean, besides connecting two of the above batteries in series, I would have to double that and create a second pack to connect in parallel?