BASIC Stamp Editor

• Once installed, the Stamp Editor will be available on your desktop, and as a menu option underStart Program Files Parallax Inc

Identifying the BASIC Stamp

Writing the Program

DEBUG “Hello World”

• Once a program is entered, the Run button (or Ctrl-R) is used to tokenize and download the program to the BASIC Stamp.

Downloading or Running Code

The Editor will request you The Editor will request you indicate the style of BASIC indicate the style of BASIC Stamp you are using.Stamp you are using.

The style may be selected from the The style may be selected from the menu, or by selecting your ‘color’ of menu, or by selecting your ‘color’ of your BASIC Stamp on the button bar.your BASIC Stamp on the button bar.

DEBUG “Hello World”‘{$STAMP BS2}DEBUG “Hello World”

A A directivedirective will be added to the top of will be added to the top of your code.your code.

Tokenizing and Errors When a program is ‘Ran’ the PBASIC code is converted to symbolic When a program is ‘Ran’ the PBASIC code is converted to symbolic

format called tokens. These are stored in ROM memory on your format called tokens. These are stored in ROM memory on your BASIC Stamp.BASIC Stamp.

In order to tokenize your program, the code must to conform to the In order to tokenize your program, the code must to conform to the rules of syntax for the language.rules of syntax for the language.

Commenting Code

• Comments, or remarks, are descriptions or explanations the programmer puts in the code to clarify what it is doing.

DEBUG Window

• Programs may contain a DEBUG instruction. This instruction sends serial data back to the computer on the serial cable.

• When DEBUG is present in a program, a DEBUG window will open in the Editor to view the returning data.

• The DEBUG button may be used to manually open a DEBUG window.

Output - Connecting an LED• Connect an LED to P8 as shown:

• In this configuration a LOW, or 0V, at P8 will allow current to flow through the LED to Vdd (+5V) lighting it. When P8 is HIGH (+5V), no current will flow and the LED will not light. The LED is Active Low.

An LED is a diode, meaning electrons can flow in only one direction, so polarity is important. The LED should have a flat side indicating the cathode or negative terminal. Also, the anode (positive terminal) generally has a longer lead than the cathode.

Connected on P8. Angle of shot makes it appear to be on P9.

Vdd, NOT Vin.

Note cathode: the ‘flat side’ of LED

220 ohm = RED RED BROWN GOLD

Blinking the LED with HIGH, LOW

• Use the Stamp Editor to enter the following program:

• Download or run the program.

• Monitor the LED. It should blink at a rate of 1 second OFF, 5 seconds ON. If not, check your configuration and code.

‘Prog 4A: Blink LED program

Main: HIGH 8 'Turn off LED PAUSE 1000 'Wait 1 second LOW 8 'Turn on LED PAUSE 5000 'Wait 5 secondsGOTO Main 'Jump back to beginning

LED Cycling

• Code a program to perform the following sequence (use HIGH and LOW):

– LED1 on P8 ON, LED2 on P9 OFF– Wait 2 seconds– LED1 on P8 ON, LED2 on P9 ON– Wait 1 second– Both LEDs OFF– Wait one-half second– Repeat

'** 4B Challenge Solution – Blink both LEDs ** Main:

LOW 8 'LED1 HIGH 9 'LED2 PAUSE 2000 'Wait 2 seconds LOW 9 'LED2 ON (P9 LED stays on) PAUSE 1000 'Wait 1 second HIGH 8 'LED1 off HIGH 9 'LED1 off PAUSE 500 'Wait one-half second

GOTO Main

Did you waste code memory by turning on an already on P8 LED?

Digital Inputs

• Just as P0 – P15 on the BASIC Stamp can act as outputs to control devices, they can act as inputs to read devices, such as switches.

• By default, the BASIC Stamp I/O pins will act as inputs unless specifically set to be an output. In our code we specify the I/O as inputs out of good programming habits.– INPUT pin– INPUT 10

Connecting an Active-Low Switch

The push-buttons used in this tutorial have 4 terminals. 2 are electrically connected on one side of the button, and the other 2 on the other side. By wiring to opposing corners we ensure the proper connection independent of button rotation.

1K = Brown Black Red Gold

Active-High Push-Button Switch

The BASIC Stamp has uncommitted inputs. That is, when an I/O pin is not connected and acting as an input, it cannot be assured to be either HIGH or LOW. Pull-up and pull-down resistors are needed to commit the input to the non-active (open) state for switches.

The 1K resistor is used to prevent a short-circuit between Vdd and Vss when the switch is closed.

Reading the Switch

'Prog 4E: Display the status of PB1 on P10

INPUT 10 'Set P10 to be an input

Main: DEBUG ? IN10 'Display status of P10 PAUSE 500 'Short pauseGOTO Main 'Jump back to beginning

Controlling Outputs with Inputs

'Prog 4F: Controlling LED1 with input PB1

INPUT 10 'Set P10 to be an inputOUTPUT 8 'Set P8 to be an output

Main: OUT8 = IN10 'Set LED1 = PB1GOTO Main 'Jump back to beginning

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7 segment