1131 User Guide - Revision history

Jdecoux: Reverted edits by Jdecoux (talk) to last revision by Mparadis

2018-11-28T19:54:48Z

Reverted edits by Jdecoux (talk) to last revision by Mparadis

← Older revision		Revision as of 19:54, 28 November 2018
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	\text{Force (grams) = 15.311}e^{5.199 \times \text{VoltageRatio}}		\text{Force (grams) = 15.311}e^{5.199 \times \text{VoltageRatio}}
	</math>		</math>
	~~<tabber>~~
	~~Measurement Accuracy=~~
	===Measurement Accuracy===		===Measurement Accuracy===
	To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.		To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.
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	*Gain and offset trimming can be used as a simple method of calibration. The reference voltage and feedback resistor of the current-to-voltage converter are adjusted for each FSR to pull their responses closer to the nominal curve.		*Gain and offset trimming can be used as a simple method of calibration. The reference voltage and feedback resistor of the current-to-voltage converter are adjusted for each FSR to pull their responses closer to the nominal curve.
	*Curve fitting is the most complete calibration method. A parametric curve fit is done for the nominal curve of a set of FSR devices, and the resultant equation is stored for future use. Fit parameters are then established for each individual FSR (or sending element in an array) in the set. These parameters, along with the measured sensor resistance (or voltage), are inserted into the equation to obtain the force reading. If needed, temperature compensation can also be included in the equation.		*Curve fitting is the most complete calibration method. A parametric curve fit is done for the nominal curve of a set of FSR devices, and the resultant equation is stored for future use. Fit parameters are then established for each individual FSR (or sending element in an array) in the set. These parameters, along with the measured sensor resistance (or voltage), are inserted into the equation to obtain the force reading. If needed, temperature compensation can also be included in the equation.
	~~\|-\|~~
	~~Do's and Dont's=~~
	===FSR Usage Tips - Do's and Dont's===		===FSR Usage Tips - Do's and Dont's===
	*'''Do''', if possible, use a firm, flat and smooth mounting surface.		*'''Do''', if possible, use a firm, flat and smooth mounting surface.
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	*'''Do not''' use cyanoacrylate adhesives (e.g. Krazy Glue®) and solder flux removing agents. These degrade the substrate and can lead to cracking.		*'''Do not''' use cyanoacrylate adhesives (e.g. Krazy Glue®) and solder flux removing agents. These degrade the substrate and can lead to cracking.
	*'''Do not''' apply excessive shear force. This can cause delamination of the layers.		*'''Do not''' apply excessive shear force. This can cause delamination of the layers.
	~~</tabber>~~
	{{UGasens}}		{{UGasens}}

	{{UGnext\|}}		{{UGnext\|}}

Jdecoux at 19:52, 28 November 2018

2018-11-28T19:52:59Z

← Older revision		Revision as of 19:52, 28 November 2018
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	\text{Force (grams) = 15.311}e^{5.199 \times \text{VoltageRatio}}		\text{Force (grams) = 15.311}e^{5.199 \times \text{VoltageRatio}}
	</math>		</math>
			<tabber>
			Measurement Accuracy=
	===Measurement Accuracy===		===Measurement Accuracy===
	To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.		To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.
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	*Gain and offset trimming can be used as a simple method of calibration. The reference voltage and feedback resistor of the current-to-voltage converter are adjusted for each FSR to pull their responses closer to the nominal curve.		*Gain and offset trimming can be used as a simple method of calibration. The reference voltage and feedback resistor of the current-to-voltage converter are adjusted for each FSR to pull their responses closer to the nominal curve.
	*Curve fitting is the most complete calibration method. A parametric curve fit is done for the nominal curve of a set of FSR devices, and the resultant equation is stored for future use. Fit parameters are then established for each individual FSR (or sending element in an array) in the set. These parameters, along with the measured sensor resistance (or voltage), are inserted into the equation to obtain the force reading. If needed, temperature compensation can also be included in the equation.		*Curve fitting is the most complete calibration method. A parametric curve fit is done for the nominal curve of a set of FSR devices, and the resultant equation is stored for future use. Fit parameters are then established for each individual FSR (or sending element in an array) in the set. These parameters, along with the measured sensor resistance (or voltage), are inserted into the equation to obtain the force reading. If needed, temperature compensation can also be included in the equation.
			\|-\|
			Do's and Dont's=
	===FSR Usage Tips - Do's and Dont's===		===FSR Usage Tips - Do's and Dont's===
	*'''Do''', if possible, use a firm, flat and smooth mounting surface.		*'''Do''', if possible, use a firm, flat and smooth mounting surface.
Line 61:		Line 63:
	*'''Do not''' use cyanoacrylate adhesives (e.g. Krazy Glue®) and solder flux removing agents. These degrade the substrate and can lead to cracking.		*'''Do not''' use cyanoacrylate adhesives (e.g. Krazy Glue®) and solder flux removing agents. These degrade the substrate and can lead to cracking.
	*'''Do not''' apply excessive shear force. This can cause delamination of the layers.		*'''Do not''' apply excessive shear force. This can cause delamination of the layers.
			</tabber>
	{{UGasens}}		{{UGasens}}

	{{UGnext\|}}		{{UGnext\|}}

Mparadis: /* Formulas */

2018-05-10T17:53:35Z

Formulas

← Older revision		Revision as of 17:53, 10 May 2018
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	The 1131 can handle applied forces of up to 2kg.		The 1131 can handle applied forces of up to 2kg.
	===Formulas===		===Formulas===
	{{UGSensorFormula\|force (grams)}}The Formula to translate voltage from the sensor into a force in grams is:		{{UGSensorFormula\|force (grams)}}The Formula to translate voltage ratio from the sensor into a force in grams is:


	:<math>		:<math>
	\text{Force (grams) = 15.311}e^{1.~~0398~~ \times \text{~~Voltage~~}}		\text{Force (grams) = 15.311}e^{5.199 \times \text{VoltageRatio}}
	</math>		</math>

Mparadis at 20:55, 8 May 2018

2018-05-08T20:55:44Z

← Older revision		Revision as of 20:55, 8 May 2018
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			__NOINDEX__
	<metadesc>The Phidgets Thin Force Sensor comes with an adapter board already attached for convenience. Measures up to 2 kg of force.</metadesc>		<metadesc>The Phidgets Thin Force Sensor comes with an adapter board already attached for convenience. Measures up to 2 kg of force.</metadesc>
	[[Category:UserGuide]]		[[Category:UserGuide]]

Jdecoux at 18:03, 11 April 2018

2018-04-11T18:03:32Z

← Older revision		Revision as of 18:03, 11 April 2018
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	Next, you will need to connect the pieces:		Next, you will need to connect the pieces:
	[[Image:1131_0_Connecting_The_Hardware.jpg\|500px\|right\|link=]]		[[Image:1131_0_Connecting_The_Hardware.jpg\|500px\|right\|link=]]
	# Connect the 1131 to the ~~1018~~ with the Phidget cable.		# Connect the 1131 to the HUB0000 with the Phidget cable.
	# Connect the ~~1018~~ to your computer with the USB cable.		# Connect the HUB0000 to your computer with the USB cable.

	<br clear="all">		<br clear="all">
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	==Using the 1131==		==Using the 1131==
	{{UGcontrolpanelSensor\|1131\|~~1018~~}}		{{UGcontrolpanelSensor\|1131\|HUB0000}}

	{{UGSensorVoltageRatioInput\|1131\|force (grams)}}		{{UGSensorVoltageRatioInput\|1131\|force (grams)}}

Mparadis at 16:18, 29 November 2017

2017-11-29T16:18:15Z

← Older revision		Revision as of 16:18, 29 November 2017
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			<metadesc>The Phidgets Thin Force Sensor comes with an adapter board already attached for convenience. Measures up to 2 kg of force.</metadesc>
	[[Category:UserGuide]]		[[Category:UserGuide]]
	==Getting Started==		==Getting Started==

Lmpacent at 19:37, 21 June 2017

2017-06-21T19:37:23Z

← Older revision		Revision as of 19:37, 21 June 2017
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	Next, you will need to connect the pieces:		Next, you will need to connect the pieces:
	[[Image:1131_0_Connecting_The_Hardware.jpg\|~~400px~~\|right\|link=]]		[[Image:1131_0_Connecting_The_Hardware.jpg\|500px\|right\|link=]]
	# Connect the 1131 to the 1018 with the Phidget cable.		# Connect the 1131 to the 1018 with the Phidget cable.
	# Connect the 1018 to your computer with the USB cable.		# Connect the 1018 to your computer with the USB cable.

Lmpacent at 16:42, 19 June 2017

2017-06-19T16:42:44Z

← Older revision		Revision as of 16:42, 19 June 2017
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	==Technical Details==		==Technical Details==
	===~~Force Sensor~~===		===General===
	The ~~Force Sensor~~ can handle applied forces of up to ~~2 kg~~.		The 1131 can handle applied forces of up to 2kg.
	===Formulas===		===Formulas===
	{{UGSensorFormula\|force (grams)}}The Formula to translate voltage from the sensor into a force in grams is:		{{UGSensorFormula\|force (grams)}}The Formula to translate voltage from the sensor into a force in grams is:

Lmpacent at 21:15, 16 June 2017

2017-06-16T21:15:34Z

← Older revision		Revision as of 21:15, 16 June 2017
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	[[Category:UserGuide]]		[[Category:UserGuide]]
			==Getting Started==
			{{UgSensorIntro\|1131\|Thin Force Sensor\|Voltage Ratio Input port}}

	~~===Required Hardware===~~

	* A [{{SERVER}}/products.php?product_id=1131 1131 Force Sensor]		Next, you will need to connect the pieces:
	* An InterfaceKit or Hub to ~~read~~ the ~~sensor~~
	* A Phidget cable
	* A USB cable
	* A computer

	~~===Connecting the Pieces===~~
	[[Image:1131_0_Connecting_The_Hardware.jpg\|400px\|right\|link=]]		[[Image:1131_0_Connecting_The_Hardware.jpg\|400px\|right\|link=]]
	# Connect the ~~force sensor~~ to the ~~InterfaceKit or Hub~~ with the Phidget cable.		# Connect the 1131 to the 1018 with the Phidget cable.
	# Connect the ~~InterfaceKit or Hub~~ to your computer with the USB cable.		# Connect the 1018 to your computer with the USB cable.

	<br clear="all">		<br clear="all">
	~~==Testing Using Windows==~~		{{UGIntroDone\|1131}}

	{{~~UgSensor~~}}		==Using the 1131==
			{{UGcontrolpanelSensor\|1131\|1018}}

			{{UGSensorVoltageRatioInput\|1131\|force (grams)}}

	==Technical Details==		==Technical Details==
			===Force Sensor===
	The Force Sensor can handle applied forces of up to 2 kg.		The Force Sensor can handle applied forces of up to 2 kg.

	===Formulas===		===Formulas===
	The Formula to translate voltage from the sensor into a force in grams is:		{{UGSensorFormula\|force (grams)}}The Formula to translate voltage from the sensor into a force in grams is:


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	===Measurement Accuracy===		===Measurement Accuracy===
	To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the ~~sensor~~ voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.		To ensure the most accuracy, a small disc (included) can be placed directly on the sensing pad before applying force to the disc. This will ensure that all the force is applied directly to the sensing pad and not to the surrounding surface. The longer the object rests on the sensing pad, the more the voltage will drift and increase slowly in value. It is very difficult to compensate for the drift since different constant forces will produce different drift rates. For this reason, the average accuracy of this sensor is within 10% of the true value. The formula above was determined after the object with a known mass was resting on the sensing pad for 15 seconds. The general drift rate curve is logarithmic with time.

	====Set up a Repeatable and Reproducible Mechanical Actuation System====		====Set up a Repeatable and Reproducible Mechanical Actuation System====
	*Provide a consistent force distribution. FSR response is very sensitive to the distribution of the applied force. In general, this precludes the use of dead weights for characterization since exact duplication of the weight distribution is rarely repeatable cycle-to-cycle. A consistent weight (force) distribution is more difficult to achieve than merely obtaining a consistent total applied weight (force). As long as the distribution is the same cycle-to-cycle, then repeatability will be maintained. The use of a thin elastomer between the applied force and the FSR can help absorb error from inconsistent force distributions.		*Provide a consistent force distribution. FSR response is very sensitive to the distribution of the applied force. In general, this precludes the use of dead weights for characterization since exact duplication of the weight distribution is rarely repeatable cycle-to-cycle. A consistent weight (force) distribution is more difficult to achieve than merely obtaining a consistent total applied weight (force). As long as the distribution is the same cycle-to-cycle, then repeatability will be maintained. The use of a thin elastomer between the applied force and the FSR can help absorb error from inconsistent force distributions.
	*Keep the actuator area, shape, and compliance constant. Charges in these parameters significantly alter the response characteristic of a given sensor. Any test, mock-up, or evaluation conditions should be closely		*Keep the actuator area, shape, and compliance constant. Charges in these parameters significantly alter the response characteristic of a given sensor. Any test, mock-up, or evaluation conditions should be closely
	matched to the final use conditions. The greater the cycle-to-cycle consistency of these parameters, the greater the device repeatability. In human interface applications where a finger is the mode of actuation,		matched to the final use conditions. The greater the cycle-to-cycle consistency of these parameters, the greater the device repeatability. In human interface applications where a finger is the mode of actuation,
	perfect control of these parameters is not generally possible. However, human force sensing is somewhat inaccurate; it is rarely sensitive enough to detect differences of less than ± 50%.		perfect control of these parameters is not generally possible. However, human force sensing is somewhat inaccurate; it is rarely sensitive enough to detect differences of less than ± 50%.
	*Control actuator placement. In cases where the actuator is to be smaller than the FSR active area, cycle-~~tocycle~~ consistency of actuator placement is necessary. (Caution: FSR layers are held together by an adhesive that surrounds the electrically active areas. If force is applied over an area which includes the adhesive, the resulting response characteristic will be drastically altered.) In an extreme case (e.g., a large, flat, hard actuator that bridges the bordering adhesive), the adhesive can present FSR actuation		*Control actuator placement. In cases where the actuator is to be smaller than the FSR active area, cycle-to-cycle consistency of actuator placement is necessary. (Caution: FSR layers are held together by an adhesive that surrounds the electrically active areas. If force is applied over an area which includes the adhesive, the resulting response characteristic will be drastically altered.) In an extreme case (e.g., a large, flat, hard actuator that bridges the bordering adhesive), the adhesive can present FSR actuation
	*Keep actuation cycle time consistent. Because of the time dependence of the FSR resistance to an applied force, it is important when characterizing the sensor system to assure that increasing loads (e.g. force ramps) are applied at consistent rates (cycle-to-cycle). Likewise, static force measurements must take into account FSR mechanical setting time. This time is dependent on the mechanics of actuation and the amount of force applied and is usually on the order of seconds.		*Keep actuation cycle time consistent. Because of the time dependence of the FSR resistance to an applied force, it is important when characterizing the sensor system to assure that increasing loads (e.g. force ramps) are applied at consistent rates (cycle-to-cycle). Likewise, static force measurements must take into account FSR mechanical setting time. This time is dependent on the mechanics of actuation and the amount of force applied and is usually on the order of seconds.

	====Develop a Nominal Voltage Curve and Error Spread====		====Develop a Nominal Voltage Curve and Error Spread====
	When a repeatable and reproducible system has been established, data from a group of FSR parts can be collected. Test several FSR parts in the system. Record the output voltage at various pre-selected force points throughout the range of interest. Once a family of curves is obtained, a nominal force vs. output voltage curve and the total force accuracy of the system can be determined.		When a repeatable and reproducible system has been established, data from a group of FSR parts can be collected. Test several FSR parts in the system. Record the output voltage at various pre-selected force points throughout the range of interest. Once a family of curves is obtained, a nominal force vs. output voltage curve and the total force accuracy of the system can be determined.

	====Use Part Calibration if Greater Accuracy is Required====		====Use Part Calibration if Greater Accuracy is Required====
	For applications requiring the highest obtainable force accuracy, part calibration will be necessary. Two methods can be utilized: gain and offset trimming, and curve fitting.		For applications requiring the highest obtainable force accuracy, part calibration will be necessary. Two methods can be utilized: gain and offset trimming, and curve fitting.

Mparadis at 16:21, 6 June 2017

2017-06-06T16:21:35Z

← Older revision		Revision as of 16:21, 6 June 2017
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	===Required Hardware===		===Required Hardware===

	* A 1131 Force Sensor		* A [{{SERVER}}/products.php?product_id=1131 1131 Force Sensor]
	* An InterfaceKit or Hub to read the sensor		* An InterfaceKit or Hub to read the sensor
	* A Phidget cable		* A Phidget cable