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+ | ====== Force-sensitive Resistor (FSR) ====== | ||
+ | ===== Summary | ||
+ | ==== Introduction | ||
+ | A **force-sensitive resistor** (alternatively called a **force-sensing resistor** or simply an **FSR**) has a variable resistance as a function of applied pressure. | ||
+ | |||
+ | These devices are fabricated with elastic material in four layers, consisting of: | ||
+ | * A layer of electrically insulating plastic; | ||
+ | * An //active area// consisting of a pattern of conductors, which is connected to the leads on the tail to be charged with an electrical voltage; | ||
+ | * A plastic //spacer//, which includes an opening aligned with the active area, as well as an air vent through the tail; | ||
+ | * A flexible substrate coated with a thick polymer conductive film, aligned with the active area. This polymer is very often replaced by a layer of FSR ink. | ||
+ | |||
+ | {{ sensors: | ||
+ | |||
+ | When external force is applied to the sensor, the resistive element is deformed against the substrate. | ||
+ | |||
+ | Operationally, | ||
+ | |||
+ | The same applied force will result in a wider output swing in a FSR than a strain gauge. Strain gauges, however, have higher accuracy than an FSR. Depending upon the particular needs of the application, | ||
+ | ==== Using an FSR ==== | ||
+ | One of the most common circuits implemented to utilize an FSR's output is the [[tutorials: | ||
+ | |||
+ | === Mounting === | ||
+ | Because the FSR's operation is dependent on its deformation, | ||
+ | |||
+ | === Output === | ||
+ | The | ||
+ | |||
+ | This sensor is known to have poor [[accuracy]], | ||
+ | |||
+ | |||
+ | === History === | ||
+ | The FSR was invented by Franklin Eventoff in 1977 as an attempt to make digital instruments more expressive. Early instruments include the [[http:// | ||
+ | ===== Devices | ||
+ | |||
+ | //Prices listed below are updated to March 2011// \\ | ||
+ | |||
+ | <box 100% round blue|**Interlink Electronics FSR**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | |||
+ | * [[http:// | ||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | Datasheet: {{http:// | ||
+ | Resources: {{http:// | ||
+ | Notes: Prices vary depending on the size and shape of the sensor. See also the "FSR Design Kit." | ||
+ | Variants: There are four formats: 0.2" and 0.5" diameter circular, 1.5" x 1.5" square, and 24" long strip\\ | ||
+ | </ | ||
+ | |||
+ | <box 100% round blue|**Interlink Electronics FSR Design Kit**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | |||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | \\ | ||
+ | Datasheet: {{http:// | ||
+ | Resources: {{http:// | ||
+ | Notes: Great kit for beginners, except for the waste from the limited range of sizes available!\\ | ||
+ | Variants:\\ | ||
+ | </ | ||
+ | |||
+ | <box 100% round blue|**Tekscan FlexiForce sensors**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | Datasheet: {{http:// | ||
+ | Resources: | ||
+ | Notes:\\ | ||
+ | Variants: A201 MODEL; HT201 (HIGH-TEMP) MODEL; A401 MODEL\\ | ||
+ | </ | ||
+ | |||
+ | <box 100% round blue|**Infusion Systems TouchMicro-5 v1.2**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | Datasheet: {{http:// | ||
+ | Resources: | ||
+ | Notes:\\ | ||
+ | Variants: Lots of variants according to the size, length of the tail and smoothness of the response. All the members of the //Touch// family share the same technology. Price varies according to the size.\\ | ||
+ | </ | ||
+ | |||
+ | <box 100% round blue|**Sensitornics Force Sensing Resistors**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | Datasheet: {{http:// | ||
+ | Resources: | ||
+ | Notes:The Force-Sensing Resistor are available in both //Shunt Mode// and //Thru Mode// \\ | ||
+ | Variants: Force-Sensing Resistor; Translucent FSR; Clear FSR\\ | ||
+ | </ | ||
+ | |||
+ | <box 100% round blue|**IEE, formerly LuSense**> | ||
+ | <box 30% round red right|Sources> | ||
+ | * [[http:// | ||
+ | </ | ||
+ | Description: | ||
+ | Datasheet: N/A \\ | ||
+ | Resources: | ||
+ | Notes:The information on the website of the company are very vague about the technical characteristics of the sensors. No datasheet is available. \\ | ||
+ | Variants:\\ | ||
+ | </ | ||
+ | ===== Media ===== | ||
+ | |||
+ | <box 100% round red left|**Images**> | ||
+ | {{sensors: | ||
+ | </ | ||
+ | |||
+ | <box 100% round red left|**Videos**> | ||
+ | {{http:// | ||
+ | </ | ||
+ | |||
+ | ===== External links & references ===== | ||
+ | * G. Burdea, //Force and Touch Feedback for Virtual Reality.// New York, NY: Wiley, 1996. | ||
+ | * Interlink Electronics, | ||
+ | * [[http:// | ||
+ | |||
+ | {{tag> |