ME456:Mechatronics

WAM Chapter 1:Getting Started

Prof. Clark J. Radcliffe

Mechanical Engineering

Michigan State University

http://www.egr.msu.edu/classes/me456/radcliff

BASIC Stamp II

• An integrated microcontroller system• Postage Stamp Size, Programmed in BASIC

2k byteEEPROM

5 voltRegulator

InterpreterChip

PIC16C57w/ 26 bytes RAM

20 MHzResonator

SerialInterface

I/O Pins0-7

I/O Pins8-15

The Basic Stamp

• Introduced them in 1992. • As of July 2000, > 200,000 BASIC Stamp

modules into use. • Each BASIC Stamp includes:

– a BASIC Interpreter chip– internal memory (RAM and EEPROM)– a 5-volt regulator– 16 general-purpose I/O pins (TTL-level, 0-5 volts)– built-in commands for math and I/O pin operations.– 5 models: BS1, BS2, BS2e, BS2sx & BS2p.

BASIC Stamp I

• The original Basic Stamp• 8 i/o pins• 16 bytes of RAM• 256 bytes of program storage• Fewer programming functions• 2000 PBASIC statements/sec • 2 ma running power requirement• Parallel port interface

BASIC Stamp II

• Specifications– 4000 BASIC Statements per second– 16 Digital I/O pins

• Source 20 mA, Sink 25 mA

– Special purpose control routines– 5v power supply (50 mA)– Low power (8 mA, sleep at 0.1mA)– RS232 serial programming interface– 2k bytes program token storage

Basic Stamp 2 IC

Other BS2

• BS2e: – 64 bytes scratch pad RAM– 30 mA i/o pin current

• BS2sx:– 39 PBASIC Commands – 10,000 instructions/sec

• BS2p24: – 12,000 instructions/sec– 55 PBASIC Commands

• BSp40, BS2pe - more features

Board of Education

Allows easy prototyping with BSII5 volt 1.5ARegulator

9 volt BatteryConnector

USB / SerialInterface

To PC

BASICStamp II

Microcontroller

CircuitPrototyping

Area

DigitalI/O

Connector

5v PowerSupply

Connection

WallTransformerConnection

ResetButton

On-Off Switch

RC Servo Connections

BS2 RAM OrganizationWord Name Byte Name Nibble Name Bit Name Note

INS INLINH

INA, INBINC, IND

IN0-IN7,IN8-IN15

Input pins

OUTS OUTL,

OUTH

OUTA, OUTB,OUTC, OUTD

OUT0 – OUT7OUT8 – OUT15

Output pins

DIRS DIRL,

DIRH

DIRA, DIRB,DIRC, DIRD

DIR0 – DIR7DIR8 – DIR15

Direction bits0 = input1=output

W0 B0B1

N0N1

Bit names are not typically used (See Memory and Variables Help)

General Purposeword, byte, nibble and bit addressable

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.W12 B24

B25N48N49

PBASIC Examples

'{$STAMP BS2}'{$PBASIC 2.5}

‘Define symbolsLED CON 14 'LED control pinTime CON 15 'Pause time (ms)

‘Flash LED’s (pins connected “low”)DO ‘loop forever HIGH LED ‘Turn LED off PAUSE Time LOW LED ‘Turn LED on PAUSE TimeLOOP

Some Examples

Let’s run the Basic Stamp Editor …