blackdragon72

Thanks for the links to all the components. I ordered this: http://www.omc-stepperonline.com/9deg-thin-stepper-motor-125mm-05a-7ncm10ozin-14hr050504s-p-88.html There are two main reasons: - I want to drive coarse knob so I need at least 400 steps motor. And my knob is somehow stiff so I also want to have more torque. If it does not work then I will attach motor to fine knob. - I need a small factor (esp shallow one) so I can still store the OTA with motor attached.

I am new to Arduino based focuser design, and this is a great resource to get me started. I have ordered Arduino Uno and motor shield board, and am still waiting for order to be delivered. I am interested in to modify the sketch for Uno. This is a sample sketch I got from internet: // Include the Stepper Library #include <Stepper.h> // Map our pins to constants to make things easier to keep track of const int pwmA = 3; const int pwmB = 11; const int brakeA = 9; const int brakeB = 8; const int dirA = 12; const int dirB = 13; // The amount of steps for a full revolution of your motor. // 360 / stepAngle const int STEPS = 48; // Initialize the Stepper class Stepper myStepper(STEPS, dirA, dirB); void setup() { // Set the RPM of the motor myStepper.setSpeed(30); // Turn on pulse width modulation pinMode(pwmA, OUTPUT); digitalWrite(pwmA, HIGH); pinMode(pwmB, OUTPUT); digitalWrite(pwmB, HIGH); // Turn off the brakes pinMode(brakeA, OUTPUT); digitalWrite(brakeA, LOW); pinMode(brakeB, OUTPUT); digitalWrite(brakeB, LOW); // Log some [removed word] Serial.begin(9600); } void loop() { // Move the motor X amount of steps myStepper.step(STEPS); Serial.println(STEPS); // Pause delay(2000); // Move the motor X amount of steps the other way myStepper.step(-STEPS); Serial.println(-STEPS); // Pause delay(2000); } So looks like in addition to have different initialization code, I just need to use step(1) and step(-1) to replace clockwise() and anticlockwise() routine. I dont need to touch ASCOM driver, is my understanding correct? And is it possible to create a universal sketch to support Uno too?