Hall Effect Sensor - Revision history

Lynch: /* Detecting a Nearby Ferrous Object */

2008-02-17T15:29:49Z

Detecting a Nearby Ferrous Object

2006-08-10T20:01:57Z

Connecting to the PC/104 Stack

2006-08-04T21:38:41Z

References

2006-08-04T21:38:03Z

Angle Sensing

2006-08-04T21:36:56Z

Circuitry

2006-08-04T21:35:47Z

2006-07-12T17:57:48Z

2006-07-12T17:56:40Z

2006-07-12T17:56:18Z

2006-07-12T17:56:00Z

@@ Line 31: / Line 31: @@
 [[image:ferrous sensor.jpg|center|300px]]
-A small magnet is placed next to the hall effect sensor.  Normally, the magnetic fields are uniform, but as a metal object approaches, they are scewed.  The hall sensor picks up on this change and outputs a voltage.
+A small magnet is placed next to the hall effect sensor.  Normally, the magnetic fields are uniform, but as a metal object approaches, they are changed.  The hall sensor picks up on this change and outputs a voltage.
 [[image:ferrous sensor operation.jpg|center|500px]]

@@ Line 41: / Line 41: @@
 [[image:hallsensorsetup.jpg|center|400px]]
-===Connecting to the PC/104 Stack===
 ==References==

@@ Line 47: / Line 47: @@
 *Wikipedia, "Hall Effect Sensor", http://en.wikipedia.org/wiki/Hall_effect_sensor
 *Honeywell, "Hall Effect Sensors", http://www.honeywell-sensor.com.cn/prodinfo/magnetic_position/technical/chapter2.pdf
-*iC-Haus, "iC-MA", http://www.ichaus.com/upload/pdf/Ma_a2es.pdf
 *Quasdorf, Joachim, "A Case Study: MR vs. Hall Effect for Position Sensing," http://www.sensorsmag.com/sensors/article/articleDetail.jsp?id=314520, Nov., 2005.

@@ Line 37: / Line 37: @@
 ===Angle Sensing===
-By mounting a bipolar magnet on a shaft and placing a hall sensor near it, you can use the hall sensor to measure the angle of rotation of the shaft.  The setup below was used in the "haptic paddle" project.
+By mounting a bipolar magnet on a shaft and placing a hall sensor near it, you can use the hall sensor to measure the angle of rotation of the shaft.  The setup below was used in the "haptic paddle" project.  The small magnet is attached to the shaft and the small hall sensor is just below it.
-[[image:hallsensorsetup.jpg|center]]
+[[image:hallsensorsetup.jpg|center|400px]]
 ===Connecting to the PC/104 Stack===

@@ Line 14: / Line 14: @@
 ===Circuitry===
+Hall sensors come in small IC packages and usually have three pins.  The inside is simplified in the diagram below:
-Honeywell makes a small hall effect sensor that can be mounted on a PCB board called the SS49.  This device is used for analog sensing (angle, distance, etc.)  A diagram of the circuit is shown below.
 [[image:hallsensorcircuit.jpg|400px|center]]

@@ Line 1: / Line 1: @@
 [[Category:Sensors]]
+[[image:hall effect sensor.jpg|right|200px]]
 __TOC__
-[[image:hall effect sensor.jpg|right|200px]]
 A Hall effect sensor varies its output in response to a change in magnetic field.  They are primarily used for proximity sensing and position/rotation sensing.  By placing a hall effect sensor near a magnet attached to your device that moves in some way, you can get a voltage proportional to the distance/orientation of the magnet.  One commonly used configuration is placing the sensor directly above a dipole magnet attached to a rotating joint or shaft.  The sensor (with some circuitry) will return an analog voltage proportional to the angle of the joint or shaft.
-[[image:hall effect sensor inside.png|center]]
 ==How It Works==

@@ Line 2: / Line 2: @@
 __TOC__
 A Hall effect sensor varies its output in response to a change in magnetic field.  They are primarily used for proximity sensing and position/rotation sensing.  By placing a hall effect sensor near a magnet attached to your device that moves in some way, you can get a voltage proportional to the distance/orientation of the magnet.  One commonly used configuration is placing the sensor directly above a dipole magnet attached to a rotating joint or shaft.  The sensor (with some circuitry) will return an analog voltage proportional to the angle of the joint or shaft.
-[[image:hall effect sensor.jpg|center|200px]]
+[[image:hall effect sensor.jpg|left|200px]]
 [[image:hall effect sensor inside.png|center]]