Basic Introduction Of Stepper Motor Drive Control Board
一, Description of the board jumper: all jumpers are on the left side and are controlled by the microcontroller.
1. When the short circuit near the optical couple is hit in the direction of CLK-555, the 555 on the board provides the clock to the driver; when hitting the CLK-CPU, the right user CPU provides the clock to the driver.
2. Hit JT5 on the right: the HALF/FULL (full speed/half speed) pin of 297 is connected to GND. The default is FULL mode; when JT5 is hit on the left: the HALF/FULL pin of 297 is empty. The motor mode is controlled by the user.
3. Hit JT6 on the right: the CW/CCW pin (direction) of 297 is connected to GND. The default is clockwise rotation mode; when JT6 is hit on the left: the CW/CCW pin of 297 is empty. The user controls the motor forward and reverse mode.
二, The button description:
The board uses the brand new L297 as the control chip L298 as the driver chip The onboard NE555 clock circuit provides CLK for the L297, so this version can work without external control There are 3 control buttons onboard
EN - enable
CW - reverse rotation
HF - half speed rotation
The forward and reverse rotation, full speed/half speed and enable of the motor can be directly controlled by pressing the button.
三,Basic function description:
After the isolation of the optical coupler, the four basic control terminals of CLK CW HF EN are drawn out of the microcontroller, etc., which can be very convenient to control the work of the circuit. This board has many improvements and is convenient for research and use. The board uses a 1N5822 fast diode as a freewheeling device, which is much faster than the L298 of the rectifier bridge and the motor can provide more complete and effective protection. Module power supply +5V (L297 and L298 control power supply) +12V (minimum 4V and maximum 16V according to the motor) to supply power to the motor.
The motor output interface includes: +12V four-phase output GND (please connect according to your motor).
Control input interfaces include: GND CLK EN CW HF.
EN: High level to stop, low level to enable.
RET: high level to stop, low level to enable.
C/CW: high level counterclockwise, low level clockwise.
H/HD: High level full speed, low level half speed.
CLK: Clock pulse.
It should be noted that: for the convenience of testing, a low-frequency clock source composed of NE555 is set on the board (the jumper is placed at CLK-555 when in use). When you use an external clock signal to control the speed of the motor, you must jumper Fake it at the CLK-CPU, otherwise the external clock will not be transmitted to the L297.
四, The interface description:
1. The small second interface (JT1) on the upper left of the board: VCC is connected to +5V, GND is connected to the power ground, and the second is the working voltage of the chips L297 and 555;
2. The small eight interface (MCU-IN) in the middle left of the board is the signal isolated by the optocoupler: EN (enable), RET (reset), C/CW (forward and reverse control), H/FU (full speed/half speed) ), CLK (clock signal) +5V (Optical coupling voltage) Note: If it is not controlled by CPU, the signal of the small eight interface (MCU-IN) can not be connected to anything.
3. The working voltage of JT2 is 298 is also the working voltage of the drive motor (connected to +12V)
Note: The maximum motor power supply voltage recommended by the board is between 4V and 18V. The maximum working current does not exceed 2A, otherwise the dissipation power of the L298 will be too large and cause serious heat generation. In this case, the maximum working current can be increased to 2.5A by measures such as air cooling. about.
4. OUT is the four-phase signal line of the motor A B C D
