R4A_I2C Robots-For-All: Generic I2C support The R4A_I2C library contains generic code for a number of I2C devices including: PCA9685: LED Controller with support for: Motors - PWM control of DC motors connected with two half H-bridges Servos - PWM control of DC servos typically found in radio control models PCF8574: GPIO Extender ZED-F9P - GNSS receiver