Sorry. I should have thought to provide the link:
A4983 and A4988 Getting Started Guide
I am using an Arduino Duemilanove running this sketch:
#define stepPin 2
#define dirPin 3
#define enablePin 4
void setup()
{
// We set the enable pin to be an output
pinMode(enablePin, OUTPUT);
// then we set it HIGH so that the board is disabled until we
// get into a known state.
digitalWrite(enablePin, HIGH);
Serial.begin(9600);
Serial.println("Starting stepper exerciser.");
pinMode(stepPin, OUTPUT);
pinMode(dirPin, OUTPUT);
}
void loop()
{
int j;
// set the enablePin low so that we can now use our stepper driver.
digitalWrite(enablePin, LOW);
// wait a few microseconds for the enable to take effect
// (That isn't in the spec sheet I just added it for sanity.)
delayMicroseconds(2);
// we set the direction pin in an arbitrary direction.
digitalWrite(dirPin, HIGH);
for(j=0; j<=10000; j++) {
digitalWrite(stepPin, LOW);
delayMicroseconds(2);
digitalWrite(stepPin, HIGH);
delayMicroseconds(1000);
}}
and everything is set up just as in the tutorial. I experimented with the reset tied to the sleep pin as shown in decrDude’s diagram , pulled up to Vcc by itself and pulled up with the sleep pin attached.
There is no voltage at the outputs so there is no way to set the current. I will try and get a photo tomorrow for you to examine.
I don’t have a second A4988 board but I tried the EasyDriver board once again and confirmed that my wiring and Arduino sketch were correct.