Using ULN2803
Motor driver modules for motors allow you to control the working speed and direction of two motors simultaneously. Here we present an alternative to driving two motors using ULN2803 IC. The main advantage of this project is its low-cost design.
Circuit and working
The circuit of bi-directional DC motor control is shown in Fig. 1. It consists of ULN2803 high-current Darlington transistors array pack (IC1), four pnp BC327 transistors (T1 through T4), four resistors (R1 through R4), two switches (S1 and S2) to control motors in forward and reverse directions, and a 9V DC power supply.
Transistors T1 and T2 control motor M2, while transistors T3 and T4 control motor M1. Pin 9 of IC1 is ground and pin 10 is connected to 9V. Working of the two motors (M1 and M2) is explained in Tables I and II, respectively.
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