Mapping question help me plz The surgical laser is attached to a force sensitive
ID: 2072706 • Letter: M
Question
Mapping question help me plz
The surgical laser is attached to a force sensitive joystick that can be modeled as a force sensitive resistor, a device that changes its resistance in response to a force. Your friend sends you the joystick, and you painstakingly measure the resistance while applying a different set of forces: Force (lb) Resistance (Ohms) Determine an expression for the resistance in terms of the force. Eventually, this force sensitive resistor will be connected to an ADC so that a computer can interpret the force results and ultimately move the laser. The ADC has an input voltage range of 0-3.3V and 24 bits. What is the resolution of the ADC? Given the relationship determined above, sketch a circuit that models the force sensitive resistor over the 0-10 lb range. (use a rheostat or potentiometer) Design a circuit that takes the force sensitive resistor and drives the input of the ADC, enabling full utilization of every bit of the ADC over the 0-10lb range. Describe your design process. Draw the schematic for the circuit, labeling all passive component values and supplies.Explanation / Answer
The nonlinearities can be difficult to model, especially the time variant effects. Several empirical characteristic curves have been proposed to describe the effect. Lim and Chong [177] suggest an empirical logarithmic characteristic curve of resistance versus force R = C2e C1F .
The calculation of the magnetomotive force produced by a coil is straightforward, since a coil is equivalent to a pure voltage source. = N I, (A.5) with N the number of windings of the coil and I the current through it. The force on the piston is Fm = µ0SN2 I 2 2(l0 + leq x) 2 . (A.6)