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8 years ago.
RC Servo
Hi, After i have modified my RC servo (HS 645MG) to continous rot, i want to command it for directions(left, right and middle ) with set in a numbr of steps, is there any proposition?
2 Answers
8 years ago.
Hi, there is a very good explanation to this here: https://www.arduino.cc/en/Reference/ServoWrite Overwise just try this Program
It will start to accelerate the servo in one direction and than into the over. I would expect the servo to be driving one direction full speed at p = 0.0 and at p = 1.0 into the other. At p = 0.5 it should be still but I would expect you have to tune that.
8 years ago.
you mentioned that you modified the servo for continuous operation. That used to mean that the physical stop was taken out AS WELL AS the feedback resistor input to the drive circuitry. ' If that is the case - you won't be able to get a 'middle' position [without an external feedback of some sort - you could solder a wire from the internal feedback resistor and bring it outside the case to be hooked up to an A/D input, but there will most likely be a 'dead zone' OR use an optical encoder wheel of some sort] ' with a modified servo - it runs forward or reverse - depending on the pulse you send - 1ms for one direction, 2 ms for the opposite direction ' HTH
thanks a lot, i'd like to get explanation about your proposition, is there any link to any vidéo or some thing like this?
posted by 14 Apr 2016mini-sumo robot builders (google it) may have some links. You can have a white (or metal) wheel with
black spokes, then use an ir-detector pair to sense the black & white regions ( or just the 'middle' point!.
a disk with a hole in it could also be used for a middle point. the wire for the A/D input is a more
involved process. no specific links or videos - but the mini-sumo bots have lots of info on them.