I am working on a Robotic gripper. to open en close the gripper a Tower pro SG90 micro Servo is used.
while i was testing the robotic gripper some strange things occurred. the servo sometimes starts sweeping (goes to 180 degrees than goes to 0 degrees and repeats this process) randomly.
at first i thought that is was a fault in my program. so i loaded "Servo knob" from the sketches included with the Arduino program. same thing happens.
hooked up an different servo (other brand) no problems whatsoever.
so my feeling says that the problem lays with the servo. i have multiple servo's and every one off them works as it should except for the 4 Tower pro's
so i started searching for information about the SG90. which lead me nowhere. only things i found where:
-Homepage off Tower Pro containing almost no information whatsoever: http://www.towerpro.com.tw/viewitem1.asp?sn=584&area=50&cat=159
-A guy that controls a SG90 with a ardumoto (pulse range 600mS to 2100mS): http://mechomaniac.com/ConnectingServosToTheArdumoto
does somebody know what the problem could be?