So I'm trying to build a robotic arm a small project for local school kids and I came up to use cheap materials like SG90 servos, regulator and arduino something like the bellow pick
The only problem is that the SG90 do a lot of noise and it will be annoying to hear.
I'm planing to put all the servos in the Base cylinder box and use strings to control the hand, it's not a serious project just for kids to see and play with it.
Anyone got any idea how to make that cylinder box sound proof? What kind of materials I can use? Something that can absorbe the vibration/sound of the servos.