Hi,
I have disassembled two DVD drives. The goal is to build a mini laser engraver, but I'd like to start with an XY table and deal with the laser diode later.
My aim is to have the kit open for upgrades, so I'm not going to reinvent the wheel and want to use well-established standards of interfaces.
The firmware I'd like to use is grbl, as it gives all I need (G-code, steppers, limit switches) and is written in C that I'm most familiar with.
First things first, I'd like to make a driver for these two steppers which moved DVD head. They are well-documented bipolars which get up to 500mA per coil. As I have some L293D and Atmel chips laying around, I prefer these components.
As I understand, the main controller communicates with motor drivers with 3 wires: DIR, STEP and ENABLE. A pulse on STEP should make the driver read DIR and move the motor one step in required direction. ENABLE tells whether I should energize the coils. That looks simple, but perhaps I'm missing something?
I have disassembled two DVD drives. The goal is to build a mini laser engraver, but I'd like to start with an XY table and deal with the laser diode later.
My aim is to have the kit open for upgrades, so I'm not going to reinvent the wheel and want to use well-established standards of interfaces.
The firmware I'd like to use is grbl, as it gives all I need (G-code, steppers, limit switches) and is written in C that I'm most familiar with.
First things first, I'd like to make a driver for these two steppers which moved DVD head. They are well-documented bipolars which get up to 500mA per coil. As I have some L293D and Atmel chips laying around, I prefer these components.
As I understand, the main controller communicates with motor drivers with 3 wires: DIR, STEP and ENABLE. A pulse on STEP should make the driver read DIR and move the motor one step in required direction. ENABLE tells whether I should energize the coils. That looks simple, but perhaps I'm missing something?