I dont't understand button (Try to control the sg90 servo motor through the nodemcu)

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C++ Blynk (Legacy) - Code Examples for Basic Tasks

#4 Slow & Variable Servo Sweep Without ‘delay()’ (Yay Timers!) This is one I dug out of my archive and tweaked a bit to make it variable and stable. I also have another method of varing a timer, shown in a later post: 20 - Easy Variable Timer This example will allow you to control the sweep speed of a servo motor… normally they run at one speed, from where they are to where you want them to go. Traditional methods to slow that down is move the servo in incremental steps with a delay between…