In SX Microcontrollers, SX/B Compiler and SX-Key Tool, drfrag wrote:

Hello all, I need a little help figuring out why RB0-2 can't drive my micro servos.
I bought [url=http://www.tamvalleydepot.com/products/quadservodecoder.html]this controller[/url] and 3 of [url=http://www.tedani.com/tednix-8g-micro-servo-asm0812-13kg-p-1264.html]these servos[/url].  For some reason the servos connected to RB0-2 won't operate properly yet all 3 servos work on RB3.  I noticed that RB0-2 are also comparator connections and believe there is some interface problem between RB0-2 and the [url=http://www.swip.com.cn/en/products.php?product=yt5188]YT5188 chip[/url] used in the servo. (here is [url=http://www.swip.com.cn/product/servo/YT5188.pdf]the datasheet[/url] with 5188 circuit as the one on the YT5188 page only lists 5166 circuit)
This page has the [url=http://www.tamvalleydepot.com/howto/quadschematicsandcode.html]controller schematic[/url] and [url=http://www.tamvalleydepot.com/images/Quad_Servo_Switch_Decoder_2_5.txt]code[/url] (at bottom).

I am going to try to investigate the servo chip board more but it's really small and hard to work with.

If anyone has any ideas as to what is going on here both myself and the creator of the quad controller would really appreciate the help.

Thanx,
David

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