![]() In 4-step microstep, controller will 4x increase number of steps by approximating sinusoidal current on coils using PWM.Īlso controller will decrease current 2x with PWM when idle.ĭue to schematic simplicity, controller does not have current-feedback circuits. In half-step more, controller will double number of steps by introducing midle steps where two coils is enabled. This mode can be used to increase momentum of motor. ![]() In half-phase full spte, two coils will be enabled at at time. ![]() In full-phase full step, one of the coils will be enabled at at time. Software limits were tracked by Mach3 software.Ĭustom firmware can be configured to run each channel in one of the 4 modes: I were using off switches to disconnect motors from power source when axis limit is reached to prevent CNC damage. Two motors were connected to +12V, and one to +5V. I have been using computer ATX power source to power controller and motors. Schematic is given below:Ī separate sensor boards allows to connect X,Y and Z zero sensors, tool tip sensor and Spindle On:Ĭontroller is optoisolated ( this was the main design goal). The controller is based on ATTiny2313 micro-controller and custom firmware. ![]() I designed 3 axis STEP-DIR unipolar stepper motor controller for my CNC. ![]()
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