I am having a strange issue with my torque sensor.
Basically I have a torque sensor with a long metal rod attached. When force is applied to the rod, torque is applied that is measured by my electronics setup.
It had some noise, but after adding filter caps to the power supplies and amplifier all the noise went away.
Doing this above, everything works fine . . . but now is where it gets strange . . .
The rod now goes into contact with de-ionized water (about 180k ohms per inch). In this water I have a bunch of my waterproofed servos (that in theory at least have no electrical contact with the water) and waterproof AC lighting.
The water is entirely still and not moving, nor is anything in the water moving either. Nothing has changed from above except contact with the water.
Now the torque sensor outputs huge amounts of noise (like 20% noise)!
Attempting to correct this I ground the ground wire for the torque sensor, but no change. No additional filter capacitors made a difference.
Anyone with ideas on what is going on?
I'll try grounding the metal rod, but other than that I'm out of ideas . . .