micro servo

[Marq]

Hello. What servos would work with the Epoch's board? I need to know for my pan chassis kit.

[cdog4w]

Well, I can't fully answer this, but I can shed some light on it. I'm doing a conversion on a bit buggy to use epoch electronics and a tiny servo. It works, but its not perfect. The basic idea premise behind a normal 3 wire servo is that you have +/- to power it, and the third wire is signal. Inside the servo is a board that decodes the signal to figure out where it is supposed to be. It uses an internal potentiometer to measure where it is so that it can be where it is supposed to be. Epoch on the other hand, has 5 wires, 2 to the motor, 3 to the pot. This means that the decoder board is on the epoch circuit board and not in the servo. So to wire up a standard 3 wire servo, pop the end off, remove or wire around the circuit board and directly wire to the servo motor and potentiometer.

Now to my issues and my thoughts on them. It works, I get equal travel side to side, but it is slow and the speed seems uneven depending on which direction (turning more/or centering) and which side its on (left/right).

Anyway, heres a vid of it, and most of the time when it returns to center, its when I let the wheel go neutral (ie. im not slowly moving back to center manually, I'm letting it center itself).
http://video.google.com/videoplay?docid=-1708546317971557449

My thought is that the servo is expecting 5V but is getting less since the epoch battery is only 3cell. The other issue is that the pot in the new servo is not the same value as the stock epoch one. I tried to compensate by adding a resistor inline and got close to the value. Hard to tell how much it helped, shades of gray type of thing.