arduino motor examples for SN754410

gistfile1.txt

First get the value of the pot.
http://www.arduino.cc/en/Tutorial/Potentiometer

int potValue = value of pot... current position from 0 to 1023

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Set the direction based on pot value. If it's one way, it'll spin CW, if its another, it'll spin CCW
Based on example from http://web.ics.purdue.edu/~fwinkler/616/sn754410_Arduino.pdf

if (potValue > 512) {
    digitalWrite(motor1APin, LOW); // set leg 1 of the H-bridge low 
    digitalWrite(motor2APin, HIGH); // set leg 2 of the H-bridge high 
} else {
    digitalWrite(motor1APin, HIGH); // set leg 1 of the H-bridge low 
    digitalWrite(motor2APin, LOW); // set leg 2 of the H-bridge high 
}

speed_value_motor1 = 127; // half speed 
analogWrite(speedPin, speed_value_motor1);


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Set the speed based on pot value.

// spin one way
digitalWrite(motor1APin, LOW); // set leg 1 of the H-bridge low
digitalWrite(motor2APin, HIGH); // set leg 2 of the H-bridge high

// use the map() function to convert a 0-1023 number to a 0-255 number
// http://arduino.cc/en/reference/map
// map(value, fromLow, fromHigh, toLow, toHigh)

speed_value_motor1 = map(potValue, 0, 1023, 0, 255);
analogWrite(speedPin, speed_value_motor1);