[PSUBS-MAILIST] Speed and Direction Control for Small Brushed Motors

[Jon Wallace via Personal_Submersibles]

For a couple of weeks I've been toying with the idea of a "fly-by-wire" approach to rudder control.  I really don't like the idea of manually operated foot control found in K-subs and while thinking about how I might implement a hand control I started delving into a fly-by-wire solution after seeing a youtube video on a totally unrelated topic demonstrating small motor controllers.
I've converted a 5 volt hand-held power screwdriver into a 1-ATM housing partially filled with oil for lubrication purposes.  The torque on these small things are quite impressive and I believe may be strong enough to handle a rudder.  Even if it isn't, I can still use the motor for something else.
I combined a small motor controller that can handle 10 amps, with a TEENSY microprocessor, and a joystick which allows me to control motor spin direction, and speed.  It works amazing and total cost was about $60.  If you've got a purpose for a small electric motor with speed/direction control, you might find this project interesting.  I've written a paper and also included software, both available at PSUBS.ORG > PSUBS Community > Community Projects > Speed and Direction Control for Small Brushed Motors.
Direct link:http://www.psubs.org/community/projects/moto-1.pdf


Jon
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