Category Archives: Primus

Testing the motor driver

This is the first time I have used the SLA7062 so I made up a small test board to make sure everything will be OK. This turns out to be a splendid motor driver and the motors can be driven … Continue reading

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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 … Continue reading

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Sensor Data Analysis

Micromouse sensors are subject to several sources of error and interference. Capturing a set of data samples lets you do some simple analysis of the effects of those errors.The test rig was set up with a section of wall placed … Continue reading

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Sensor test

The simple sensor circuit described by Ng Beng Kiat seems to give the best results.On his web site (http://www.np.edu.sg/alpha/nbk/) Beng Kiat describes Min4, one of his recent mice. In there is a PDF with schematics for the mouse. The sensor … Continue reading

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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 … Continue reading

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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 … Continue reading

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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, … Continue reading

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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 … Continue reading

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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 … Continue reading

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