PCA9685 16-Channel module is very useful and can help a lot when there are insufficient PWM output pins. The most important application is to control servo motors. This module can control a large number of servo motors at the same time.

As mentioned, the PCA9685 driver can be used to control 16 servo motors. In fact, this module only uses the I2C pins of the microcontroller. You can even connect 62 of these modules together to get up to 992 PWM outputs using only the same two I2C pins.

Other features:

• Adjustable frequency PWM up to about 1.6 kHz
• 12-bit Resolution for each output

We use MG-995 servo motor to interface this module. The applied voltage of this motor should be in range of 4.8 to 7.2V. The frequency of motor is 50 Hz and the PWM duty cycle is 20 milliseconds. This motor has 3 pins as follows:

• PWM: Orange
• VCC: Red
• GND: Brown