tinyurl.com/5bn5xsxm This link will install the programming code in you computer or mobile device. PWM is for motors, see it on Wikipedia to learn more. We must use extra electrical power for motors to work with MakeCode and Microbit. The World of Modules Kit comes with a double USB so that you can add extra power to the expansion board included. The PIR sensor detects humans approaching the MINECRAFT Arena. The gray servo motor lifts the gate and the red DC motor turns the searchlight. This whole project is smaller than LEGO Mindstorms EV3f Brain and Motors. It is much cheaper and fits the size to LEGO Bricks.