Using only a ULN5804 integrated circuit, stepper motors up to 500 mA can be controlled from TTL signals with this shield. The circuit is powered with 12 V and with the pulses applied on pin 11, we will have the motor rotation command. The S1 switch allows you to select the direction of movement of the motor. The circuit is suitable for two-phase motors. An oscillator with integrated circuit 555 can be used to excite this control by causing the motor to rotate continuously.
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