For the control of a robot arm i’m using a K8000
To read the position of the robot-arm i’m using high quality linear potmeters and a 0-5V range
0V should give position 0
5V should give position 255
When moving the arm to a certain position, values fluctuate, eg.: robot arm is on fix position 200, values vary from 180-230
As you can see, it’s quiete hard to determine an exact position with this situation.
Is there any (hardware or software) solution on the K8000 to stabilize these values?
You can use a capacitor on the input of the K8000, you can use shielded cable to connect the K8000 to the potentiometer or you can use an algorithm for moving averages.
If your potentiometer has a metal housing, ground it to avoid measuring errors due to static discharges.
Thank u already for the answers.
Do you happen to know which capacitor is best suited for this usage?
The local electronics supplier couldn’t give me a direct answer, and told me to hear around…
He just told me to be careful, not to blow up the K8000-inputs this way, while the wrong capacitor could give an output much greater than the 5V.
Does anyone have a scheme, which indicates how to place the capacitor on the input?
You’re welcome.
No value known, please experiment with some values in the 10 tot 470 uF range. Beware: with high values it is possible that your readout becomes too slow and that your robot arm is already at the end of its mechanical path while your electronics are thinking it is not.
As you feed your potentiometers with a max. tension of 5 Volts, you can’t have an higher voltage than 5 V on your capacitor. Your supplier clearly isn’t an electronics specialist…
Just put a capacitor parallel on the input (between ground and incoming signal).
You just verified my own thoughts about the max of 5V, but I started hesitating after talking to the shop keeper.
Wasn’t sure about the connection, but that’s solved too now.