This drive control board has four working modes to choose from: [1] Normal Mode 1 [2] Normal Mode 2 [3] Point Operation Mode [4] Automatic round-trip Mode [ Drive Board Dimensions ] Length * width * height 60*44*16mm Basic parameters: [ Voltage Range ]DC5V-12V [ Rated Current ]≤800mA [ Reverse power connection Protection ] Yes [ Overcurrent Protection ] Yes [ Overheat protection ] Yes [ 1 ] Normal Mode 1: S1 Start and stop button, S2 Forward and reverse button, W2 potentiometer speed regulation. If reverse limiting is required, two limit switches can be externally connected to the P3 pin, and contact pieces can be installed on the motor's moving shaft. In this way, the motor will move back and forth within the stroke between the two limit switches. [ 2 ] Normal Mode 2: Press the forward start button S1 and the reverse start button S2. Press either key to stop. W2 potentiometer speed regulation. If a limit stop is required, two limit switches can be externally connected to the P3 pin. In this way, when the motor touches the limit switches, it will stop moving. When the reverse button is pressed briefly, the motor will reverse. [ 3 ] Point operation mode: Press S1 for forward rotation, release to stop; press S2 for reverse rotation, release to stop; W2 potentiometer speed regulation. If a limit stop is required, a limit switch can be connected to P3. [ 4 ] Automatic round-trip Mode: S1 starts and stops, S2 rotates forward and backward, W2 potentiometer speed regulation, W1 potentiometer adjusts the number of automatic round-trip steps. After startup, the motor automatically runs back and forth within the number of steps regulated by W1. P2 Function Description: The speed adjustment potentiometer of the W2 motor slows down when adjusted counterclockwise and speeds up when adjusted clockwise. The P2 speed adjustment extended gear pin, when in slow gear, the adjustment range of W2 is: the slowest step takes 3.125 seconds - the fastest step takes 0.0625 seconds (16 steps per second). The adjustment range of W2 in the fast mode is as follows: the slowest step takes 0.0625 seconds (16 steps per second) to the fastest step takes 0.00125 seconds (800 steps per second). Function description of W1 and P1: The W1 automatic reciprocating travel adjustment potentiometer shortens the travel when adjusted counterclockwise and lengthens it when adjusted clockwise. P1 Automatic round-trip travel adjustment extension pin. When in the short travel gear, the adjustment step range of W1 is 1 to 200 steps. When in the long-travel gear, the adjustment step range of W1 is 200 to 1200 steps. For the P5 stepper motor output pins, depending on whether you choose a 2-phase 4-wire or 4-phase 5-wire stepper motor, connect the wires correctly according to the characters on the board. P6 power input pin, which can be externally connected to a 5V-12V DC power supply Note: (1) If you want to change any function pins of P1, P2, or P4, you need to cut off the power suppl