***Question***

> *Problem in porting Rpi3B+ python GPIO PWM servo programs to Rpi4B*

***Answer***

> */ to continue, ...*


***References*** 

*[Rpi4B PCA9685 PWM Controller driving 4 TowerPro MG996R Servos - tlfong01][1]*

*[PCAS9685 PWM Controller Installation Notes - tlfong01][2]*

*[Rpi3B+ GPIO PWM Servo Testing Notes - tlfong01][3]*


***Appendices***

(1)  Rpi4B PCA9685 and 4 TowerPro MG996Rs

[![servo][4]][4]


  [1]: https://raspberrypi.stackexchange.com/questions/102115/slight-dip-on-the-gpio-5v-line-when-leds-are-on
  [2]: https://raspberrypi.stackexchange.com/questions/101095/rpi4b-raspbian-10-buster-circuit-python-blinka-installation-problem
  [3]: https://raspberrypi.stackexchange.com/questions/99408/pin-powered-pi-crashes-when-servos-move
  [4]: https://i.sstatic.net/06fVd.jpg