28123 Parallax Inc, 28123 Datasheet - Page 154

• Manufacturer Part Number: 28123
• Description: TEXT WHAT'S A MICROCONTROLLER
• Manufacturer: Parallax Inc
• Type: Programmingr

Specifications of 28123

• Style: Book
• Title: What's a Microcontroller?
• Contents: Whats a Microcontroller? Text
• Product: Microcontroller Accessories
• Core Processor: PIC16C57c
• Flash: 128 Bytes
• Operating Supply Voltage: 9 V
• Board Size: 31 mm x 16 mm
• Lead Free Status / RoHS Status: Not applicable / Not applicable

' What's a Microcontroller - PolledRcTimer.bs2
' Reaction timer program modified to track an RC-time voltage decay.
' {$STAMP BS2}
' {$PBASIC 2.5}
timeCounter
counter
DEBUG CLS
HIGH 7
DEBUG "Capacitor Charging...", CR
FOR counter = 5 TO 0
NEXT
DEBUG CR, CR, "Measure decay time now!", CR, CR
INPUT 7
DO
PAUSE 1000
DEBUG DEC2 counter, CR, CRSRUP
PAUSE 100
timeCounter = timeCounter + 1
√
√
√
√
√
√
Record the measured time (the capacitor’s discharge time) in the 470 Ω row of
Table 5-1.
Disconnect power from your Board of Education or BASIC Stamp HomeWork
Board.
Remove the 470 Ω resistor labeled R
145, and replace it with the 1 kΩ resistor.
Reconnect power to your board.
Record your next time measurement (for the 1 kΩ resistor).
Repeat these steps for each resistor value in Table 5-1.
VAR
VAR
Table 5-1: Resistance and RC-time for C = 3300 µF
Resistance (Ω)
Word
Nib
10 k
470
1 k
2 k
Measured Time (s)
i
in Figure 5-8 and Figure 5-9 on page