Is there a Sensor / Servo Shield for Arduino UNO in nature for a large number of channels?

Question

Arduino

Good time of the year!
I am doing a project of a “smart” 17DOF humanoid robot on such a frame (and in the future - to add even more degrees of freedom to the arms and head - hence the question) based on this thing: UNO Dock from FriendlyARM. I fasten it on my back + a little higher .. otherwise, when landing, I might rest against it, which is not good;)

The joke is that you can put a regular NanoPi NEO / Air on a board where Arduino UNO is already soldered and, according to the description, get a full-fledged Linux with Python, but with all the digital / analog capabilities of the Arduino (which should just control the servo motors in the joints of the robot).

Guys, please tell me if there are shields for connecting servo drives under Arduino UNO (I took a set from RDS3115 ), for more than 16 channels? On Ali I constantly meet only such ones, and to sculpt two such shields (one above the other) - the robot is already quite “thick” already, and then there will also be two shields ..
Maybe tell me a more elegant solution based on a single-board PC on Linux for a large number of gray drives (I plan to have approximately 21 pcs.) .. but I will be glad for sensible advice and links to Ali - in any case :)
Thanks in advance!

Answer 1

You can take a couple of boards on PCA9685 for serv, what for is the shield over the arduino to sculpt.
Place PWM boards for servos closer to the servos and steer them in U2c. One on the right side, the other on the left. Only power 5V, common and SDA, SCL lines will go to the scarves.
Shields you have one horseradish one above the other will not rise. :)
Well, jerking your feet on a single-board is somehow too much or something. As an option for this, look for an inexpensive FPGA.