Stepper motor control and data acquisition system: A temperature conversion table can be established as shown in the table. The conversion table consists of 256 storage units, and each unit stores the temperature value (BCD code) corresponding to the unit address. During the operation of the main program, timer T0 sends an interrupt request to the CPU every 20ms. In the process of responding to the T0 interrupt request, the CPU calls the interrupt service subroutine (i.e., the six-digit LED dynamic scanning display program) about 50 times per second to display the measured temperature. From the working principle of the three-phase stepper motor, it can be seen that the stepper motor usually has three power-on working modes: Assuming that the power is turned on in the above sequence, the stepper motor rotates forward, and then the power is turned on in the opposite direction, the stepper motor reverses. Use P1.0, P1.1, and P1.2 of the single-chip microcomputer to control the A, B, and C phase windings of the stepper motor respectively. Find the control model from the control method From the working principle of the stepper motor, it can be seen that the design of the stepper motor control program mainly includes: 1. Determine the direction of rotation; 2. Send out control pulses in sequence; 3. Whether the pulses are sent; 4. Constant speed or variable speed; 5. When changing speed, you need to determine whether to increase or decrease speed.
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