I broke the "VIn Connect" jumper at the back of the motor shield board.
I used a 12V 1.5A power supply from an old scanner.
I achieved 300mm per second.
arduino code:
// stepper motor control using http://arduino.cc/en/Main/ArduinoMotorShieldR3
#define ADIR 12
#define BDIR 13
#define APOWER 3
#define BPOWER 11
void setup() {
pinMode(3, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);
pinMode(9, OUTPUT);
pinMode(8, OUTPUT);
pinMode(0, INPUT);
pinMode(1, INPUT);
}
int stage = 0;
void set_stage(int i)
{
switch(i)
{
case 0:
digitalWrite(ADIR, 0);
analogWrite(APOWER, 255);
digitalWrite(BDIR, 1);
analogWrite(BPOWER, 255);
break;
case 1:
digitalWrite(ADIR, 1);
analogWrite(APOWER, 255);
digitalWrite(BDIR, 1);
analogWrite(BPOWER, 255);
break;
case 2:
digitalWrite(ADIR, 1);
analogWrite(APOWER, 255);
digitalWrite(BDIR, 0);
analogWrite(BPOWER, 255);
break;
case 3:
digitalWrite(ADIR, 0);
analogWrite(APOWER, 255);
digitalWrite(BDIR, 0);
analogWrite(BPOWER, 255);
break;
}
}
void ddelay(float d)
{
for(float t = 0.0; t < d; t += 0.01)
{
int h = 4;
h = h + 5;
h = 3*h;
h--;
}
}
void sstep(int forward)
{
if(forward)
{
stage++;
if(stage > 3)stage = 0;
}
else
{
stage--;
if(stage<0)stage = 3;
}
set_stage(stage);
}
void loop() {
// set brake pins to 0
digitalWrite(9, 0);
digitalWrite(8, 0);
// set motor pins
stage = 1;
set_stage(stage);
float d = 2;
while(1)
{
ddelay(d);
sstep(1);
d = d * 0.99975;
if(d<0.85)d = 0.85;
}
}
