Analog Input Primer - Revision history

Mparadis: /* Mechanical Specifications */

2014-04-11T18:55:03Z

Mechanical Specifications

@@ Line 9: / Line 9: @@
 ==Mechanical Specifications==
-Each Analog Input uses a 3-pin, 0.100 inch pitch locking connector.
+{{AnalogConnector}}
 ==Electrical Specifications==

Mparadis: /* Interfacing to an Arbitrary Sensor */

2013-06-24T17:09:00Z

Interfacing to an Arbitrary Sensor

← Older revision		Revision as of 17:09, 24 June 2013
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	[[Image:arbitrary_sensor.jpg\|right\|link=\|thumb\|250px\|Schematic for connecting to a sensor.]]		[[Image:arbitrary_sensor.jpg\|right\|link=\|thumb\|250px\|Schematic for connecting to a sensor.]]

			Normally, you can connect a sensor directly to the analog input as long as it has a 0-5V range (or smaller). However, if the sensor is not designed to send its signal across a long cable, you may need to add components as shown in the image.

	Note the use of power supply decoupling and the RC Filter on the output.		Note the use of power supply decoupling and the RC Filter on the output.

Burley: /* Electrical Specifications */

2013-05-23T17:47:50Z

Electrical Specifications

← Older revision		Revision as of 17:47, 23 May 2013
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	The RawSensorValue property brings out a 12-bit value (0-4095) for users who require maximum accuracy.		The RawSensorValue property brings out a 12-bit value (0-4095) for users who require maximum accuracy.
	Please note that the sampling is actually done with an oversampled 10-bit ADC, but reported as a 12-bit value to allow future expansion.		Please note that the sampling is actually done with an oversampled 10-bit ADC, but reported as a 12-bit value to allow future expansion.

			One side effect of this oversampling is that very low noise signals will not get full resolution from the ADC without dithering noise injected into the signal.

	The analog inputs on Phidgets interface kits are designed for a maximum of 5V. More than this will cause unpredictable behaviour and could damage the board.		The analog inputs on Phidgets interface kits are designed for a maximum of 5V. More than this will cause unpredictable behaviour and could damage the board.

Mparadis: /* Interfacing 3.3V Sensors */

2012-11-20T19:11:25Z

Interfacing 3.3V Sensors

← Older revision		Revision as of 19:11, 20 November 2012
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	[[File:33vsensor.jpg\|thumb\|200px\|link=\|Interfacing a 3.3V Sensor using a 3.3V power supply.<br/>[[Media:33vsensor.jpg\|Full-sized Image]]]]		[[File:33vsensor.jpg\|thumb\|200px\|link=\|Interfacing a 3.3V Sensor using a 3.3V power supply.<br/>[[Media:33vsensor.jpg\|Full-sized Image]]]]

	When using a 3.3V sensor with the analog input of a Phidget InterfaceKit, the main challenge is generating the 3.3V supply. You can either buy a 3.3V power supply, or you can buy a voltage regulator to convert the 5V line on the analog input to a 3.3V line, as illustrated in the diagrams. You can also use a second analog input to monitor the output of the 3.3V supply or the regulator. Note that SensorValue will still be equal to the input voltage multiplied by 200, so a 3.3V sensor will saturate at a SensorValue of 667 instead of the usual 1000.		When using a 3.3V sensor with the analog input of a Phidget InterfaceKit, the main challenge is generating the 3.3V supply. You can either buy a 3.3V power supply, or you can buy a voltage regulator to convert the 5V line on the analog input to a 3.3V line, as illustrated in the diagrams. You can also use a second analog input to monitor the output of the 3.3V supply on the regulator. Note that SensorValue will still be equal to the input voltage multiplied by 200, so a 3.3V sensor will saturate at a SensorValue of 667 instead of the usual 1000.

	If the sensor is ratiometric, you can determine the measured value of the sensor expressed as a percentage of the maximum value by dividing the sensor value of analog input 0 by analog input 1. For example, if analog input 1 measures a SensorValue of 667, and analog input 0 measures a SensorValue of 133, then you know that the sensor's measured value is twenty percent of the sensor's maximum value.		If the sensor is ratiometric, you can determine the measured value of the sensor expressed as a percentage of the maximum value by dividing the sensor value of analog input 0 by analog input 1. For example, if analog input 1 measures a SensorValue of 667, and analog input 0 measures a SensorValue of 133, then you know that the sensor's measured value is twenty percent of the sensor's maximum value.

Mparadis at 21:09, 22 August 2012

2012-08-22T21:09:47Z

← Older revision		Revision as of 21:09, 22 August 2012
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	You can use the [{{SERVER}}/products.php?product_id=1132 1132 - 4-20mA Sensor Interface] to read a 4-20mA sensor with an analog input. For more information on 4-20mA sensors, see the [[4-20mA Sensor Interface Primer]].		You can use the [{{SERVER}}/products.php?product_id=1132 1132 - 4-20mA Sensor Interface] to read a 4-20mA sensor with an analog input. For more information on 4-20mA sensors, see the [[4-20mA Sensor Interface Primer]].

			==List of Devices with Analog Input==

			{{:Devices with Analog Inputs}}

	==Non Phidgets Analog Sensors==		==Non Phidgets Analog Sensors==

Mparadis: /* Interfacing 4-20mA Sensors */

2012-08-20T21:11:55Z

Interfacing 4-20mA Sensors

← Older revision		Revision as of 21:11, 20 August 2012
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	===Interfacing 4-20mA Sensors===		===Interfacing 4-20mA Sensors===

	You can use the [{{SERVER}}/products.php?product_id=1132 1132 - 4-20mA Sensor Interface] to read a 4-20mA sensor with an analog input. For more information on 4-20mA sensors, see the [[4-~~20mA_Sensor_Interface_Primer~~]].		You can use the [{{SERVER}}/products.php?product_id=1132 1132 - 4-20mA Sensor Interface] to read a 4-20mA sensor with an analog input. For more information on 4-20mA sensors, see the [[4-20mA Sensor Interface Primer]].

	==Non Phidgets Analog Sensors==		==Non Phidgets Analog Sensors==

Mparadis: /* Connecting non-Phidget devices to the Analog Inputs */

2012-08-20T21:11:24Z

Connecting non-Phidget devices to the Analog Inputs

← Older revision		Revision as of 21:11, 20 August 2012
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	<br clear="all">		<br clear="all">

			===Interfacing 3.3V Sensors===

			[[File:33vregulator.jpg\|thumb\|200px\|link=\|Interfacing a 3.3V Sensor using a voltage regulator.<br/>[[Media:33vregulator.jpg\|Full-sized Image]]]]
			[[File:33vsensor.jpg\|thumb\|200px\|link=\|Interfacing a 3.3V Sensor using a 3.3V power supply.<br/>[[Media:33vsensor.jpg\|Full-sized Image]]]]

			When using a 3.3V sensor with the analog input of a Phidget InterfaceKit, the main challenge is generating the 3.3V supply. You can either buy a 3.3V power supply, or you can buy a voltage regulator to convert the 5V line on the analog input to a 3.3V line, as illustrated in the diagrams. You can also use a second analog input to monitor the output of the 3.3V supply or the regulator. Note that SensorValue will still be equal to the input voltage multiplied by 200, so a 3.3V sensor will saturate at a SensorValue of 667 instead of the usual 1000.

			If the sensor is ratiometric, you can determine the measured value of the sensor expressed as a percentage of the maximum value by dividing the sensor value of analog input 0 by analog input 1. For example, if analog input 1 measures a SensorValue of 667, and analog input 0 measures a SensorValue of 133, then you know that the sensor's measured value is twenty percent of the sensor's maximum value.

			<br clear=all>

			===Interfacing 4-20mA Sensors===

			You can use the [{{SERVER}}/products.php?product_id=1132 1132 - 4-20mA Sensor Interface] to read a 4-20mA sensor with an analog input. For more information on 4-20mA sensors, see the [[4-20mA_Sensor_Interface_Primer]].

	==Non Phidgets Analog Sensors==		==Non Phidgets Analog Sensors==

Burley at 16:43, 10 August 2012

2012-08-10T16:43:07Z

← Older revision		Revision as of 16:43, 10 August 2012
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	Analogs Inputs are used to interface many different types of sensors, such as temperature, humidity, position, or pressure sensors.		Analogs Inputs are used to interface many different types of sensors, such as temperature, humidity, position, or pressure sensors.
	Phidget InterfaceKits such as the [~~http://www.phidgets.com~~/products.php?product_id=1018 1018 - PhidgetInterfaceKit 8/8/8] have multiple analog inputs.		Phidget InterfaceKits such as the [{{SERVER}}/products.php?product_id=1018 1018 - PhidgetInterfaceKit 8/8/8] have multiple analog inputs.
	Each Analog Input provides power (Nominal +5VDC), ground, and an analog voltage return wire driven by the sensor to some voltage.		Each Analog Input provides power (Nominal +5VDC), ground, and an analog voltage return wire driven by the sensor to some voltage.
	The Interface Kit continuously measures this return voltage and reports it to the application.		The Interface Kit continuously measures this return voltage and reports it to the application.

Mparadis: /* Ratiometric Configuration */

2012-08-08T17:35:20Z

Ratiometric Configuration

← Older revision		Revision as of 17:35, 8 August 2012
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	affected by the setting of the Ratiometric property.		affected by the setting of the Ratiometric property.

			The ratiometric setting of the interface kit applies to all inputs. Trying to read a sensor with the wrong ratiometric setting will result in incorrect readings. However, it is technically possible to use both ratiometric and non-ratiometric sensors at the same time if you poll for one sensor and then switch the kit's ratiometric setting before polling the other sensor.
	When switching ratiometric mode on and off, you need to include a short delay (50ms should be more than enough) before you begin reading values in. This gives the device time to react.		When switching ratiometric mode on and off, you need to include a short delay (50ms should be more than enough) before you begin reading values in. This gives the device time to react.

Mparadis at 14:57, 27 July 2012

2012-07-27T14:57:35Z

← Older revision		Revision as of 14:57, 27 July 2012
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	Phidgets offers a wide variety of sensors that can be plugged directly into the board using the cable included with the sensor.		Phidgets offers a wide variety of sensors that can be plugged directly into the board using the cable included with the sensor.

	~~To see a list of currently available analog sensors, click [[List of Sensors\|here]].~~

	==Mechanical Specifications==		==Mechanical Specifications==