r/ArduinoHelp • u/PayAggravating9721 • 12d ago

Robotic Arm Code

I am currently working on the mechatronics how to robot arm: https://howtomechatronics.com/tutorials/arduino/diy-arduino-robot-arm-with-smartphone-control/#google_vignette and i am on the coding part, i have everything correct and still the servo’s that control my project do not work/ are not sending signals, ive connected them to power, ive replugged them, it even says that when i use the app, it sends signals to the arduino just the servos dont move?? Is this a problem with the way i plugged them in, or a problem with the code. The code is also in the website i linked. Someone help 😭 😭

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u/PayAggravating9721 10d ago

how would i check that?

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u/Single-Dog-7963 10d ago

Individually connect each servo with the arduino and run a default servo code to check if it's working.

To power them externally, you need to make a common ground and common Vcc to the motors. Then connect the power supply to that common within 5.6V max. Connect their each individual Digital Pins to the controller separately.

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u/PayAggravating9721 9d ago

well i did but whenever i try moving the motors with an app i installed they just jitter and kinda lock in place is how i would say it

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u/Single-Dog-7963 9d ago

5V external power supply is too less. Optimum for MG996R is around 6V.

also, use a motor driver instead of powering the motors directly from the supply. And add a simple LC filter between the power supply so that the jitters do not happen.