Step Generator Using the 555 IC (MEC159E)

This circuit is part of my book Robotics, Mechatronics and Artificial Intelligence (sold out) published in the United States. It can be used as a control shield for stepper motors in a mechatronics or robotics project or as a building block for simple projects.

The circuit shown in Figure 1 produces the pulses necessary to drive a translator coupled to a stepper motor. The circuit is an oscillator wherein the output frequency determines the speed of the stepper motor when it operates as a common motor.

S1 is a switch used to step down the frequency range when closed. The circuit can be powered from supplies in the range between 5 and 18 V. P1 adjusts the frequency, and the output is compatible with TTL and CMOS logic.

P1 can be replaced by a resistive sensor such as an LDR to control the speed from external signals (see Section 10 for more details).


Figure 1 Step generator using the 555 IC.
Figure 1 Step generator using the 555 IC.