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PICAXE-28X2 S

HIELD

 B

ASE

 (AXE401)

revolution

Revolution Education Ltd.     Web: www.picaxe.co.uk

Version 1.3 04/11

AXE401.PMD

1.0 Introduction

Thank you for purchasing this PICAXE shield base. This

datasheet is designed to give a brief introduction to how the

shield base is assembled, used and configured.

For general tutorials and details on how to use the PICAXE

programming language, please see the PICAXE website and

PICAXE manuals 

www.picaxe.co.uk

 The completely free

programming software may also be downloaded from this

website. For individual project advice, and examples of how to

connect your shield base to many different shields and electronic

components, please consider joining the friendly online PICAXE

community at 

www.picaxeforum.co.uk

A ‘wiki’ of how to use the PICAXE shield base with a wide range

of shields is currently being developed at the PICAXE website.

1.1 Overview

The PICAXE shield base is an open-source hardware ‘arduino inspired’ controller board, designed to

enable PICAXE use of the multiple different ‘shields’ that are now available. The shield base has been very

carefully designed to be compatible with the vast majority of existing shields. Each PICAXE shield base is

also provided with a free of charge AXE405 prototyping shield PCB for experimentation.

The PCB designs are released as ‘open-source’ and ‘not for profit’ designs.

1.2 Key Features

Firmware

PICAXE-28X2

Microcontroller

Microchip PIC18F25K22-I/SP

Programming Language

BASIC or flowcharts

Physical Size & Header Position

Standard Shield Size/Position

Open Source Hardware

Yes

Not for profit PCB

Yes

Development Software Cost

Free

Support for Windows

Yes

Support for Mac

Yes

Support for Linux

Yes

Downloads via USB port

Yes

Microcontroller System Voltage

5V or 3V (jumper selectable)

Recommended Supply Voltage

9-12V

5V Low drop out regulator

500mA

3V Low drop out regulator

500mA

Disconnectable LED on S.13

Yes

Stripboard compatible headers

Yes

On board i2c EEPROM socket

Yes

Separate programming and i/o pins

Yes

TX / RX select jumper headers

Yes

Through hole for easy self assembly

Yes

Program Slots

4 x 4k

User RAM bytes

1296 (256 + 1024 + 16)

Clock Speed

32KHz - 64MHz

Non-volatile EEPROM bytes

256

Run extra programs from i2c

Yes

Содержание AXE401

Страница 1: ...multiple different shields that are now available The shield base has been very carefully designed to be compatible with the vast majority of existing shields Each PICAXE shield base is also provided...

Страница 2: ...am 12 7 0 Kits Why offer a self assembly kit as well as pre assembled boards 13 7 1 AXE401 Contents pre assembled shield base 14 7 2 AXE401Kit Contents self assembly kit 14 7 3 AXE401PCB Contents PCB...

Страница 3: ...ct boards and chips so by buying this permanently low priced promotional shield PCB we hope you will consider purchasing further PICAXE microcontrollers and project boards in the future We will post t...

Страница 4: ...function which is now allocated to a completely different pin to the normal shield layout Therefore the PICAXE shield base has been very carefully laid out to ensure the special functions match the e...

Страница 5: ...In Out ADC Touch hserout kb clk C 6 18 2 S 2 In Out ADC Touch hpwm B hint 2 B 2 8 3 S 3 In Out ADC Touch pwm hint0 B 0 12 4 S 4 In Out ADC Touch hpwm C hint 1 B 1 10 5 S 5 In Out ADC Touch pwm B 5 13...

Страница 6: ...has 4 not 6 PWM channels Therefore if a required PWM hardware feature is not on an available pin a very simple modification may be required As a real world example let us look at the Sparkfun Ardumot...

Страница 7: ...are designed to work with a 5V system voltage so jumper H1 should be left in the 5V position However when building your own circuit using a proto shield with a third party 3V only device for instance...

Страница 8: ...3 A single download cable can be used for all your different PICAXE projects even those not built upon shield bases Therefore the initial cost of the intelligent AXE027 download cable is slightly mor...

Страница 9: ...oldered onto the board in position X1 As the PICAXE 28X2 contains an internal 4x PLL multiplier an external 16MHz resonator provides a 64MHz operating frequency An external 8 MHz resonator would provi...

Страница 10: ...d provide additional program or data storage memory space The 28X2 program could also be updated using the booti2c command using an EEPROM inserted into this socket A suitable part would be the Microc...

Страница 11: ...E software is available as the Programming Editor for Windows and AXEpad for Mac and for Linux All three titles are completely free to download and use If you prefer to program in a different third pa...

Страница 12: ...and the COM port is set to the AXE027 PICAXE USB cable Click OK 6 Type in this program picaxe 28x2 do high S 13 pause 1000 low S 13 pause 1000 loop and then click the PICAXE Program menu If all is we...

Страница 13: ...re provided with a completely free AXE405 prototyping shield PCB A starter pack including the AXE027 USB cable as well as the assembled shield base is also available AXE410U The self assembly board is...

Страница 14: ...1 RG1 1 5V 500mA LD1117V50 regulator LD50V RG2 1 3 3V 500mA LD1117V33 regulator LD33V C1 C2 C3 3 22uF 35V electrolytic capacitor 22u C4 C5 2 100nF polyester capacitor 104 or 1 L1 L2 2 3mm yellow LED S...

Страница 15: ...aders into the following combinations 8 2 8 2 6 3 1 6 3 1 7 3 not required on preassembled kit The 1x 2 way and 3x 3 way lengths are used on the AXE401 PICAXE shield base The 2x 8 way and 2x 6 way len...

Страница 16: ...ther anyway 6 Solder the two LEDs in positions L1 and L2 The long leg positive anode of the LED must be in the hole nearest the marking on the PCB 7 Solder the two 100nF marked 100n or 1 capacitors in...

Страница 17: ...embly is now complete 7 7 Optional Components not supplied Peel the protective covering from the rear of the PCB over the pads for X1 ICSP and IC2 if present This can be easily lifted with a finger na...

Страница 18: ...2 6 way 2 54mm socket I O3 4 2 8 way 2 54mm socket This is the minimum parts list required for a minimalistic very low cost solution Here the shield base is configured for permanent battery power eit...

Страница 19: ...n this case the solder joints will be on the bottom side of the PCB 8 1 Using the proto shield The proto shield is a tri pad design where most of the prototyping solder pads are joined together in set...

Страница 20: ...ut any I O pin S 2 recommended 10 0V GND 14 Vref 3V3 It is also common to connect an LED and 180R resistor between these XBee pins and GND so that the status of the XBee module may be observed 6 RSSI...

Страница 21: ...4 5 6 7 8 9 10 11 12 13 14 VIC GND 28 27 26 25 24 23 22 21 20 19 18 17 16 15 S A0 A 0 S A1 A 1 S A2 A 2 S A3 A 3 TXD S 8 C 0 S 9 C 1 S 10 C 2 B 7 S 7 B 6 S 6 B 5 S 5 B 4 S A5 B 3 S A4 B 2 S 2 B 1 S 4...

Страница 22: ...100n C3 22u C2 22u C1 22u R8 330 L2 Vin V5V V3V3 VIC GND Reset V3V3 V5V GND GND Vin Power Header CON1 Appendix B Circuit Schematics Power and optional EEPROM Circuits IC2 A0 A1 A2 GND Vcc WP SCL SDA R...

Страница 23: ...23 revolution Revolution Education Ltd Web www picaxe co uk Version 1 3 04 11 AXE401 PMD AXE401 PICAXE 28X2 Shield Base Appendix C Dimensions TOP...

Страница 24: ...ree Free Support for Windows Yes Yes Support for Mac Yes Yes Support for Linux Yes Yes Downloads via USB port Yes Yes The microcontroller comparison is Program Slots 4 x 4k 1 x 14k 30k User RAM bytes...

Страница 25: ...cts both chips will do a very good job In global terms Microchip have a larger market share of the commercial microcontroller market and in 2008 attempted an unsuccessful buyout of Atmel Each chip has...

Страница 26: ...a PIC microcontroller but program it in assembler or C or other language instead of using the PICAXE system Can I do this Of course you can use whichever PIC programming system you like On the side o...

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