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I need 48 sg90 servos to move to a specific position each minute. Now I am using two arduino mega boards to power everything through 6 bread boards but it seems I need more power because some servos are ticking and are delayed. I cant get the external power supply to work independently of the computer. Once I unplug from my computer the servos jitter. Any help would be greatly appreciated.

  • ...Schematic...? – Majenko Oct 16 at 9:33
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    make sure you have connected all the grounds together, i mean from both the Arduino boards, i had similar issue when using ESP8266 module and Arduino UNO together! check this first and also make sure the power supply is regulated and sufficient for your needs. – Somasundharam Sampath Oct 17 at 6:03
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Most servos use an analog signal (width of a pulse) for positioning. Any perturbation in that signal will cause unexpected behavior. Activating 48 servos simultaneously will likely indirectly or directly affect the analog signal.

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The unexpected behavior might be mitigated through changes in software or hardware. These mitigation efforts may include:

  1. Staggering the servo changes so that only 1 servo moves at a time.
  2. Perhaps less effective but worth trying, staggering the servo changes so only 1 servo starts moving at a time. In this scenario more than 1 servos may be moving at a time.
  3. Using a power supply which maintains the expected voltage even during events such as all servos starting simultaneously.

These are only 3 options to consider. Many more exist but may not be pertinent to your situation. More information is needed.

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    For 3: A short power surge could also be handled with a big capacitor between Vcc and ground. Those could provide the current needed for the spike and prevent the voltage from dropping – chrisl Oct 17 at 21:58

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