Force Sensing Resistor placement
Force Sensing Resistor placement
(OP)
Need some help getting my head around what I need to build to make this work. If you look at the links I have listed here you can see a drawing of what it is that I am talking about. I want to put a FSR at the 4 cardinal positions in this joystick. I would like it to be bolted up tight so nothing moves. So when I push the stick forward the forward FSR in conjunction with the rear FSR will out put the amount of force applied. My question is will the FSR be able to "read" anything in this configuration? The second concern is will the left and right FSR's values change while pushing forward.
Post 415 shows a pic of the model
http://www.benchmarksims.org/forum/showthread.php?...
Post 433 shows a pic of the plates and the spacers that will be used to hold in the base.
http://www.benchmarksims.org/forum/showthread.php?...
Maybe I should give up on the FSR's and go with the mini strain gauge. But then I have to work out the electronics end of things.
Any thoughts?
Thanks
Menessis
Post 415 shows a pic of the model
http://www.benchmarksims.org/forum/showthread.php?...
Post 433 shows a pic of the plates and the spacers that will be used to hold in the base.
http://www.benchmarksims.org/forum/showthread.php?...
Maybe I should give up on the FSR's and go with the mini strain gauge. But then I have to work out the electronics end of things.
Any thoughts?
Thanks
Menessis





RE: Force Sensing Resistor placement
RE: Force Sensing Resistor placement
OK this is what I have so far. The tubes on top are the eight spacers that the bolts pass through to hold it in place. The tubes on the bottom are not part of the project. The FSR's will be in 4 locations. Top, bottom, left and right between the two discs.
Thanks for letting me know about the dud links Scott.
Menessis
RE: Force Sensing Resistor placement
Excessive force will deflect the rod towards the pipe on the bottom end of the joystick. Use location of this rod to read force. (In a torque wrench, the rod would deflect and indicate on a scale, the tq applied.)
Have you identified the FSR you will be using? It wasn't clear between unusable links and lack of info in original post, this suggestion may or may not work with what you have in mind. But, in any event there may be some merit to moving the force reading away from the mounting bolts.
If you want to simplify components, consider some type of pneumatic or hydraulic bladder system to push pistons tied to linear actuators. This could transform small deflections in mounting plates to useable linear positions. Placing the bladders should be pretty intuitive, sandwich between two mounting plates, one of which has at least a small amount of flexibility. Now I think I like this suggestion more than the first, but I've already typed it so I will leave both.
RE: Force Sensing Resistor placement
TTFN
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RE: Force Sensing Resistor placement
Menessis
RE: Force Sensing Resistor placement
Four of any type of sensor is over-constrained and makes the math harder.
Use three strain gauges on the tube, 120 degrees apart.
RE: Force Sensing Resistor placement
Menessis
RE: Force Sensing Resistor placement
Menessis
RE: Force Sensing Resistor placement
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: Force Sensing Resistor placement
RE: Force Sensing Resistor placement
Menessis
RE: Force Sensing Resistor placement