This post was last modified: 2018-08-15, 00:54 by
npeters.
Hello Hans - I have downloaded the original stepper circuit diagram for the device where the Pro Timer sends the signal to the stepper controller, or are you referring to the design of the new one you have posted where the stepper controls the timer?
If it is the first original design, then it looks to me like "transistor T2 and resistor R3" should maybe say "transistor T1 and resistor R3" as these are connected together (as are transistor T2 and resistor R4). I also see that T1 and R3 are wired between Arduino pin PB3 to the output focus pin, so can you confirm which transistor and resistor you mean please as I don't want to make a mistake :-)
And yes, I am shooting stars with the timer, and I want to add the stepper & slider to make it more interesting. I haven't yet got to buying a rail or gearing, but the motor I have bought was sourced from *bay and is described as a NEMA17 motor, as follows:
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"NEMA 17 Stepper motor 12V For CNC Reprap 3D printer extruder 36oz-in 26Ncm 0.4A"
Model:42SHD0001-24
Step angle: 1.8°
Rated voltage: 12V
Number of phase: 2
Rated current: 0.4A
Insulation resistance: 100MΩmin.(500V DC)
Resistance per phase: 30Ω±10%
Insulation class: Class B
Inductance per phase : 37mH±20%
Rotor intertia: 38g.cm^2
Holding torque: 260mN.m
Mass: 0.2kg
Detent torque: 12mN.m
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Hope I bought the right sort....
Any advice will be appreciated.
Many thanks, Norm