28128 Parallax Inc, 28128 Datasheet - Page 156

• Manufacturer Part Number: 28128
• Description: KIT BASIC ANALOG/DIGI PARTS ONLY
• Manufacturer: Parallax Inc

Specifications of 28128

• Accessory Type: ADC, DAC
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp® 2 and Board of Education
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Then
Program It
Enter Program 8.1 in your BASIC Stamp Editor, and download to the BASIC Stamp.
' Basic Analog and Digital - PL8_1R0.bs2
' Program Listing 8.1 Revision 0.
' {$STAMP BS2}
' {$PBASIC 2.5}
light
dischargeTime
sound
a
DO
LOOP
The Output
The piezoelectric speaker should beep every half second or so. If you put your hand over
the circuit to shade it, the tone of the beep should get lower. If you face your breadboard
directly at a light in the room, the pitch should get higher. Figure 8-5 a sample output for
a well-lit room.
HIGH 15
PAUSE 100
RCTIME 15, 1, light
dischargeTime = light * 2
sound = (65535 - light) / a
FREQOUT 7, 500, sound
DEBUG HOME
DEBUG "Discharge time = ", DEC5 dischargeTime, " u-seconds."
DEBUG CR, CR, "Sound Frequency = ", DEC5 sound, " Hz."
PAUSE 500
RCTIME
RCTIME 15, 1, light
takes care of the time measurement and data storage.
VAR
VAR
VAR
CON
Word
Word
Word
40