Category Archives: Primus

Primus Chassis

Now the motors are here and the brackets cut, it is time to assemble the bare boards to see what the mouse will look like.Primus is intentionally simple and consequently a bit chunky. Two large and two small boards are needed. These are conveniently cut from pieces of perforated prototyping board. ideally this will be… Read More »

Motor driver chip

The Allegro SLA7062M stepper driver is a excellent choice for a versatile and robust stepper motor driver.This device will let you drive a unipolar stepper motor at voltages up to 46 Volts and 3A per phase. It employs an internal PWM control of motor current which is can be set by a pair of external… Read More »

Motor Mounting

The Sanyo Denki 103H546 is a completely standard stepper motor in a size 17 frame. The mounting face is tapped with four conveniently located holes tapped for M3 screws.All we need is a simple way to fix the motor to the base and main circuit board. For that, some kind of right-angle bracket is required.… Read More »

Selecting the motors

For general ease of construction and simplicity for the new mouse builder, stepper motors are hard to beat. They are also generally large and heavy. A bit of a search soon turns up a variety of possible motors for Primus.Ideally, we would have a small motor to allow the construction of a sleek, compact mouse.… Read More »

Starter mouse dimensions

The maze has dimensions fixed by the competition rules. Further, the mouse is limited to a maximum size of 250mm x 250mm. When the competition was devised, this was a fairly significant constraint. in these days of tiny processors with everything on board and handy, small, batteries, it makes sense, even for the beginner, to… Read More »

Primus – a starter mouse

Some time ago, I described a simple stepper based micromouse chassis that was to form the basis for an open design for the beginner. Well, After a long gestation period, I think I am about ready to start on that.The chassis will be pretty much as described at Minos06 with a modular layout allowing the… Read More »