GMW
AN_125KIT
Magnet target The AN_125 development kit provides a complete solution to evaluate the 2SA-10-SO, 2-axis Hall sensor in angular position applications. A PIC16F684 microprocessor interface/interpolator is included with software to convert the 2SA10’s SIN and COS signals to an analog angular position output with 0.1 deg resolution and +/- 0.5 deg accuracy. The kit is very flexible and also provides a PWM output proportional to the angle. The full scale angle range can easily be set as well as two angles for digital outputs.
Kit Specifications

Input Power :

Voltage: 8-16VDC

Current: 25mA

Outputs :

Analog voltage: 0.5 to 4.5 VDC

PWM: 10% to 90% @ 2KHZ rep rate

Discrete outputs: 2ea. Open collector digital ( 20 mA)

User Interface

Push button switch - Calibration

Push button switch - Minimum angle set

Push button switch - Maximum angle set

Push button switch - Digital out 1 position

Push button switch - Digital out 2 position

LED - Calibrate / Heartbeat

LED - End of travel - Min angle

LED - End of travel - Max angle

LED - Digital Position 1

LED - Digital Position 2
¼ inch shaft magnet holder
2SA-10
Y
X
COS
"X" TP
SIN
CAL
A1 Set
A2 Set
D1 Set
D2 Set
SIN
COS
"Y" TP
PWM
D1
D2
5 V Reg
LP
Filter
(7-16VDC)
PWM Out
Analog Out
D1 Out
D2 Out
GND
+V
P
A
D1
D2
GND
Operational Description
Functional Block Diagram

Normal Operation

No magnet present: If the vector magnitude of the sensor is less than 20% of full scale, the LEDs will blink in a distinct ”seeking pattern”. Analog output will be 0.0V and both digital outputs will be inactive.

Magnet present: CAL light will be lit solid. Analog output will track magnet position from 0.5V at the user defined minimum position to 4.5 V at the user defined maximum position. If the magnet position travels beyond the user defined minimum position, the output will hold at 0V and the MIN LED will light. If the magnet position travels beyond the user defined maximum position, the output will hold at 5V and the MAX LED will light. If the magnet is with +/- 5 deg of a stored digital position, the associated digital output will be active.

Min / Max Position Set

User presses MIN or MAX button. System stores the present angular position as the Min or MAX value. MIN or MAX LED will blink rapidly for 1 second to confirm storage.

D1 / D2 Position Set

User presses D1 or D2 button. System stores the present angular position as the D1 or D2 value. D1 or D2 LED will blink rapidly for 1 second to confirm storage

Calibration

User presses the CAL button to initiate calibration. Calibration light blinks and remains blinking through the calibration process.

User moves the magnet through several rotations. Min and Max values are sampled for each axis through this process.

User presses the CAL button to finalize calibration. Calibration values (min, max, and center of each axis) are stored. Calibration stops blinking.
5.5

2SA-10 sensor and microprocessor PCB assembly with 9V battery clip

Plastic guide and knob with magnet
 ¼ inch shaft holder with magnet

CD with the following documentation

Circuit schematic

System schematic

Bill of materials

Program listing

Program documentation / flow diagrams

Device programming files (HEX records)

Users Guide
Note: Developed code will function with all PIC12#### and PIC16#### processors
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
5
0
Sample output graph for 50 deg to 200 deg range
50 100 150 200
Angle of rotation in deg
250 300 350
AN_125_KIT.doc 20 Dec, 2004
GMW
955 Industrial Road, San Carlos, CA 94070 Tel: (650) 802-8292 Fax: (650) 802-8298
Email: sales@gmw.com Web site: http://www.gmw.com