Connect the servo's +5 V and GND connections to an external power supply and the remaining signal wire to any Raspberry Pi I/O pin to make a Raspberry Pi control a servo motor. Remember to connect any GND pin on the Raspberry Pi to the power supply's ground.
The PI has HW I2C, which we can utilize to interact with a PWM driver like the PCA9685, which Adafruit uses in their 16-channel 12-bit PWM/Servo Driver! Using our simple Python library and this tutorial, you can simply drive up to 16 servo motors on your Raspberry Pi with this breakout.
Because a motor requires a variable supply of 5 volts, it cannot be operated directly from the Raspberry Pi's GPIO ports. This implies that it must be powered separately. However, motor controller add-on boards can be used to provide this functionality.
The circuit for operating a DC motor with a Raspberry Pi is fairly simple to create. To begin, connect the L293D's pins 8 and 16 (VCC2 and VCC1) to an external 5V supply (assuming you are using a 5V Motor). On the L293D, there are four ground pins. Connect pin 4 to the supply's GND.
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