Many Servos with one Arduino

Hi every body
I'm working on a robotic arm and i'v try to run it with one arduino and no external power ! at first it worked but when i've added bleutooth module it didn't work !
I've made the attach in the loop before witing the angle

Sorry to hear that. But I don’t think you’ll get much help unless you provide a lot more details.

Try reading “How to use this forum - please read” at the top of this and every forum. That has lots of useful information about what’s needed.

All I can say so far is you shouldn’t be using servo.attach() in loop(). Once in setup() is almost always enough.

Steve

i'v try to run it with one arduino and no external power

What does that mean? So where is the power coming from? USB, batteries, ... ?