Problems with controlling Tower pro SG90 servo

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hi everybody,

i working on robotic gripper. open en close gripper tower pro sg90 micro servo used.
while testing robotic gripper strange things occurred. servo starts sweeping (goes 180 degrees goes 0 degrees , repeats process) randomly.
at first thought fault in program. loaded "servo knob" sketches included arduino program. same thing happens.
hooked different servo (other brand) no problems whatsoever.

so feeling says problem lays servo. have multiple servo's , every 1 off them works should except 4 tower pro's
so started searching information sg90. lead me nowhere. things found where:

-homepage off tower pro containing no information whatsoever: http://www.towerpro.com.tw/viewitem1.asp?sn=584&area=50&cat=159
-a guy controls sg90 ardumoto (pulse range 600ms 2100ms): http://mechomaniac.com/connectingservostotheardumoto

does know problem be?

robin

quote
does know problem be?


does servo warm? other servos work expected, sg90 might bad. servo warm? describe result of servo not being connected arduino/power supply ground.


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