IMS MicroLYNX - Page 50

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Program Examples
There are three program exercises we will use to illustrate the use of the Analog
Input/Joystick Module. In each case a 1kΩ potentiometer is used to emulate a
sensor for analog input mode, and a joystick for velocity mode.
Use the connection configuration shown in figure 9.10 below, a joystick or a
sensor would be connected the same way.
Exercise 1: Velocity (Joystick) Mode
Here the potentiometer is emulating a joystick. Enter and execute the following
program. When the voltage on AIN 1 is roughly 100mV either side of 2.5 volts it
will be in the deadband range of the joystick. When less than 2.4 volts, the axis
will accelerate in the minus (-) direction. When more than 2.6 volts, it will
accelerate in the positive (+) direction. The velocity will increase as the voltage
decreases from 2.4 to 0, or increases from 2.6 to 5.0. This can be watched with a
multimeter. In this exercise both the axis velocity and position will display to the
terminal screen.
'****Parameters****
MSEL=256
MRC=100
MAC=100
MUNIT=51200
JSDB=100 ‘Joystick deadband =100 aunits
VM =10000 ‘max velocity 10,000 munits/sec
ADS 1=1000,2,1 ‘chan. 1,aunits=1000, joystick, linear law
JSE = 1 ‘enable joystick functions
'****Program****
PGM 1
PRINT "\e[2J"
LBL RUN
MICRO
TM
MicroLYNX
123
+5V Reference
EXPANSION BO ARD S
GND
AIN 1
1k
Potentiometer
Ω
Motor, Power and
Communications
Connections not
shown.
Figure 9.10: Analog Input Module Exercise Connection
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