2-Axis Joystick Documentation v1.1

Advanced Circuit

This circuit creates two voltage dividers referenced to VDD (in this case 5 V), using a 2-channel ADC (in this

case the MCP3202) to read the voltages at the L/R and U/D pins using the code below. Caution: Do not

apply voltage to the L/R+ or U/D+ pins that exceeds the I/O pin voltage rating of the device you connect to

L/R or U/D, up to 10 VDC maximum. Ground<Analog voltage output at L/R and U/D<VDD.

BASIC Stamp

2 Program

' {$STAMP BS2}

' {$PBASIC 2.5}

CS PIN 0 ' Chip Select (MCP3202.1)

Clock PIN 1 ' Clock (MCP3202.7)

DataIn PIN 2 ' --> Data Out (MCP3202.6)

DataOut PIN 3 ' --> Data In (MCP3202.5)

Cnts2Mv CON $0139 ' x 1.22 (To Millivolts)

result0 VAR Word ' Conversion Result CH0

result1 VAR Word ' Conversion Result CH1

mVolts0 VAR Word ' Result0 --> mVolts

mVolts1 VAR Word ' Result1 --> mVolts

DEBUG CLS, "ADC CH 0:", CR, "Volts :", CR,

"ADC CH 1:", CR, "Volts :"

LOW CS ' Enable ADC

SHIFTOUT DataOut, Clock, MSBFIRST, [%1101\4] ' Select CH0, Single-Ended

SHIFTIN DataIn, Clock, MSBPOST, [result0\12] ' Read ADC

HIGH CS ' Disable ADC

mVolts0 = result0 */ Cnts2Mv ' Convert To Millivolts

LOW CS ' Enable ADC

SHIFTOUT DataOut, Clock, MSBFIRST, [%1111\4] ' Select CH1, Single-Ended

SHIFTIN DataIn, Clock, MSBPOST, [result1\12] ' Read ADC

HIGH CS ' Disable ADC

mVolts1 = result1 */ Cnts2Mv ' Convert To Millivolts

DEBUG HOME, CRSRXY, 9, 0, DEC result0, CLREOL,

CRSRXY, 9, 1, DEC mVolts0 DIG 3,

".", DEC3 mVolts0,

CRSRXY, 9, 2, DEC result1, CLREOL,

CRSRXY, 9, 3, DEC mVolts1 DIG 3,

".", DEC3 mVolts1

PAUSE 100

LOOP