Available soon. Price $50.00
This is a 4 axis drive board that is designed to run with voltages between 12 and 24 volts with a maximum motor amperage of 2.0 Amps. Small heatsinks are attached to the drive chips and may require active cooling (a fan blowing air across the heatsink) depending on the actual current setting and applied voltage. The drive board comes with 4 plug-in screw terminals that plug in to the green sockets shown in the picture.
STEP & DIR Setting
The drive STEP/DIR are configured as follows:
Signal - DB25 Pin - IDC26 Pin
STEP X - Pin 2 - Pin 3
DIR X - Pin 3 - Pin 5
STEP Y - Pin 4 - Pin 7
DIR Y - Pin 5 - Pin 9
STEP Z - Pin 6 - Pin 11
DIR Z - Pin 7 - Pin 13
STEP A - Pin 8 - Pin 15
DIR A - Pin 9 - Pin 17
The STEP/DIR signals are compatible with standard 5V and lower power 3.3V parallel port signals.
Extra I/O connections
The board has a 10-pos screw terminal with unused parallel port I/O routed to it. The I/O are unfiltered, unbuffered, and not isolated by the drive board. They are simply pass through from the IDC26 header. The numbers (i.e 17 in P17) represents the DB25 parallel port pin number from a standard PC parallel port output. From they left they are:
Motor amperage Setting
Current Limit = VREF × 2
Example: To set for 1 A, set the reference voltage (Vref) to 0.5 V.
The Vref can be measured on the metal dial of the potentiometer referenced to GND
The GND pin is the lower position on the blue screw terminal, away from the green motor connectors.
The VBB pin (motor power) is the upper position of the blue screw terminal next to the "MAX" label.
The Vref should be set with no motors attached.
To set the motor resolution, jumpers can be added to the headers next to the drives:
MODE0 MODE1 MODE2 Microstep Resolution
Low Low Low Full step
High Low Low Half step
Low High Low 1/4 step
High High Low 1/8 step
Low Low High 1/16 step
High Low High 1/32 step
Low High High 1/32 step
High High High 1/32 step
with no jumper installed, the mode will be LOW, while adding a jumper will cause the input to be HIGH. The example in the picture shows the drive set for 1/16th step with a:
Low Low High 1/16 step setting.
On the right hand side of the board is a jumper header. The jumper must be installed to enable the drive chips. If the jumper is removed, the drive chips will be disabled.
The board has two 2-pin headers that are routed to the Vbb/GND connections. These can be used to attach fans if necessary. The left pin of the connector is the GND pin, while the right pin is routed to the Vbb screw terminal. Thus if the motor power supply is 12 volts, a 12 volt fan can be plugged in to the 2-pos header to supply fan cooling for the drive board.
Never connector are disconnect a motor, a fan or DC power to the drive board with the main power supply powered up, as this can destroy the drive chips.
Make sure to provide adequate cooling for the drive chips based on the voltage/amperage levels used.