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PDF PICAXE08 Data sheet ( Hoja de datos )
| Número de pieza | PICAXE08 | |
| Descripción | Microcontroller Programming System | |
| Fabricantes | Revolution | |
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PICAXE-08 SYSTEM
1
PICAXE-08 MICROCONTROLLER
PROGRAMMING SYSTEM
mPICAXE-08
o+V
.cSerial In
Pin 4
Pin 3
1
2
3
4
8 0V
7 Pin 0 / Serial Out
6 Pin 1
5 Pin 2
t4UThe ‘PICAXE’ is an easy-to-program microcontroller system that exploits the unique
characteristics of the new generation of low-cost ‘FLASH’ memory based
emicrocontrollers. These microcontrollers can be programmed over and over again
without the need for an expensive programmer.
heThe power of the PICAXE-08 system is its simplicity. No programmer, eraser or
complicated electronic system is required - the microcontroller is programmed (with a
Ssimple ‘BASIC’ program of graphical flowchart) via a 3-wire connection to the
computer’s serial port. The operational PICAXE circuit uses just 3 components and can
tabe easily constructed on a prototyping breadboard, strip-board or PCB design.
aThe PICAXE-08 microcontroller provides 5 input/output pins.
.D• low-cost, simple to construct circuit
• 5 input/output pins (1 input with analogue capabilities)
w• rapid download via serial cable
• free, easy to use Programming Editor software
w• simple to learn BASIC language
• can also be programmed via flowcharts
w • free manuals and online support forum
The comprehensive starter pack includes the following items:
• PICAXE-08 prototype board
• download cable
• CDROM containing software and manuals
• PICAXE-08 microcontroller chip
revolution Revolution Education Ltd. Email: [email protected] Web: www.rev-ed.co.uk Version 1.0 06/09/02
© copyright 01-02
1 page  
PICAXE-08 SYSTEM
5
Inputs and Outputs
The PICAXE-08 microcontroller has 5 input/
output pins. Unlike the larger PICAXE
microcontroller (where the pins are pre-
defined) the user can select whether some of
the pins are used as input or as outputs.
PICAXE-08
+V
Serial In
Pin 4
Pin 3
1
2
3
4
8 0V
7 Pin 0 / Serial Out
6 Pin 1
5 Pin 2
Pin 0 must always be an output, and pin 3 must always be an input (this is due to the
internal construction of the microcontroller). The other 3 pins can be selected to be
inputs or outputs, and so the user can select any input/output combination between the
limits of 1 input-4 outputs and 4 inputs-1 output.
In addition pin 1 also contains a low-resolution analogue to digital converter and so
can be used as an analogue input pin if required.
Important - Don’t Get Confused!
The input/output pin numbers are NOT the same as the external ‘leg’ numbers, as the
input/output pin numbering follows the microcontrollers manufacturers port
allocation. To avoid confusion this booklet always talks about ‘legs’ where referring to
the external physical location of the input/output pin.
Leg Description
1 Positive Supply, V
2 Serial In
3 Pin 4
4 Pin 3
5 Pin 2
6 Pin 1
7 Pin 0 / Serial Out
8 Ground, G
Notes
Use a 3V to 6V battery pack as the power supply
Used for the program download
Input or output
Input only
Input or output
Input or output or analogue input
Output only. Also used for program download
Connect to the power supply (0V)
Special Note - Output Pin 0
Pin 0 (leg 7) is used during the program download, but can also be used as a normal
output once the download is complete. On the project boards a jumper link allows the
microcontroller leg to either be connected to the download socket (PROG position) or
to the output (OUT position). Remember to move the jumper into the correct position
when testing your program!
If you are making your own pcb you can include a similar jumper link or small switch,
or you may prefer to connect the microcontroller leg to both the output device and the
program socket at the same time. In this case you must remember that your output
device will rapidly switch on and off as the download takes place (not a problem with
simple outputs like LEDs, but could cause problems with other devices such as motors).
revolution Revolution Education Ltd. Email: [email protected] Web: www.rev-ed.co.uk Version 1.0 06/09/02
© copyright 01-02
5 Page 
PICAXE-08 SYSTEM
11
Connecting Wires to the Board
To make stronger connections it is suggested that when
connecting wires the ‘bare end’ of the wire is folded back
over the insulation so that both the insulation and the bare
wire are tightened into the cage of the screw terminal. This
makes a stonger joint than just connecting the bare wire
alone.
Controlling Motors.
Motors are controlled by pairs of outputs as shown by the table below.
Note that there is a 1.5V voltage drop within the L293D driver chip and so, for instance,
if a 6V supply is used the motor voltage will be 4.5V.
The chip is designed to run warm in use. This is normal.
The direction of rotation of the motors is defined as follows:
Pin 0
off
on
off
on
Pin 1
off
off
on
on
Motor A
off
forward
reverse
off
Pin 2
off
on
off
on
Pin 4
off
off
on
on
Motor B
off
forward
reverse
off
Noise Suppresion on motors:
Note that motors should be suppressed by soldering a 220nF polyester capacitor across
the motor terminals to prevent electrical noise affecting the circuit.
revolution Revolution Education Ltd. Email: [email protected] Web: www.rev-ed.co.uk Version 1.0 06/09/02
© copyright 01-02
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet PICAXE08.PDF ] | |
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