Review on Geekworm Full Function Motor HAT for Raspberry Pi 4B/3B+/3B - Robot Expansion Board for Raspberry Pi 4 Molde B, 3B+/3B/2B/B+ (Stepper/Motor/Servo/IR Remote) by Joy Janes

same embedded chip, they must have the same basic refresh rate. Most commercial servos are designed to run at 50Hz and will not work if you crank the frequency much higher. Many DC motors stall at low speeds with a 50 Hz duty cycle under light loads. Frequency. They usually require 300 Hz or preferably higher. So you can't use this board for both servo and motor speed control which is why I bought this board as it advertised both. I had to install a separate HAT servo controller on my Pi and just use this board to control the motor. . Hence the average rating for this product. Alternatively, if you only need to control a few servos, you can set up some of them to run directly from the Pi's GPIO bus, as long as you power them from a separate power supply. If you buy this product as a solution for servos and motors, forget about it. Please note that the provided Raspi-MotorHat Python library (which appears to be used from the Adafruit Raspi-MotorHat code) does not work directly with Python 3. You need to port the code to Python 3. Basically just a fix for print( ) statements.