Hi Steven,could you tell me if this engine that I found on Amazon, can be good for building this clock with Arduino nano '.Thanks so much.
Yes, that looks like a good stepper motor. The most important spec is the 30 ohm winding resistance that is needed for the low power driver used in the clock. The connector near the motor is also very convenient.
Quimat Nema 17 Stepping Motor, 26Ncm(36.8oz.in) holding torque 12V/0.4A for 3D Printer CNC : Amazon.it: Commercio, Industria e Scienza