28123 Parallax Inc, 28123 Datasheet - Page 96

• 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

This is where the
the LED connected to P15 on instead of the one connected to P14.
If neither statement is true, we still want to pause for 50 ms without changing the state of
any LED circuits.
When you’re finished with all the decisions, don’t forget the
It’s time to turn the LEDs off and pause again. You could try to decide which LED you
turned on and turn it back off. PBASIC commands execute pretty quickly, so why not
just turn them both off and forget about more decision making?
The
checking the pushbuttons and changing the states of the LEDs starts all over again.
Your Turn – What about Pressing Both Pushbuttons?
The example program has a flaw. Try pressing both pushbuttons at once, and you’ll see
the flaw. You would expect both LEDs to flash on and off, but they don’t because only
one code block in an
ENDIF
Here is how you can fix this problem:
LOOP
.
√
√
LOOP
Save PushbuttonControlOfTwoLeds.bs2 under a new name.
Replace this
statement sends the program back up to the
ELSEIF (IN4 = 1) THEN
ELSE
ENDIF
LOW 14
LOW 15
PAUSE 50
IF (IN3 = 1) THEN
PAUSE 50
HIGH 15
PAUSE 50
PAUSE 50
ELSEIF
IF...ELSEIF…ELSE
IF
keyword helps. If
statement and code block:
statement gets executed before it skips to the
IN3
is not 1, but
DO
statement, and the process of
ENDIF
IN4
.
is 1, we want to turn