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revolution

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

Version 1.3 04/11

AXE401.PMD

AXE401 PICAXE-28X2 Shield Base

Contents

1.0 Introduction ............................................................................................................................. 1
1.1 Overview .................................................................................................................................. 1
1.2 Key Features ............................................................................................................................. 1
1.3 What does open source hardware mean?...................................................................................... 3
1.4 What does ‘not for profit’ PCB mean? .......................................................................................... 3
1.5 PICAXE-28X2 microcontroller ..................................................................................................... 3
1.6 Do I have to use the shield base to use the PICAXE system? ......................................................... 3
2.0 PICAXE-28X2 shield base input/output pins ................................................................................ 4
2.1 PICAXE Shield Pinout ................................................................................................................. 5
2.2 Modifying incompatible shields .................................................................................................. 6
3.0 Power Supply ............................................................................................................................ 7
3.1 Why the 5V / 3V Jumper H1? ..................................................................................................... 7
3.2 Can I power the board from the USB port of my computer? ........................................................... 7
4.0 PICAXE USB download cable ....................................................................................................... 8
4.1 Why the download cable jumper links H2 and H3? ....................................................................... 8
5.0 Clock Speed .............................................................................................................................. 9
5.1 Why is the LED on pin S.13 connected via jumper H4? ................................................................. 9
5.2 Why the double parallel socket beside outputs S.8 to S.13? ....................................................... 10
5.3 What is the EEPROM socket for? ............................................................................................... 10
6.0 Programming the PICAXE ......................................................................................................... 11
6.1 Can I on-screen simulate PICAXE programs? .............................................................................. 11
6.2 Getting Started - Test Program ................................................................................................. 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) ................................................................................................... 14
7.4 Tools required for assembly (not supplied) ............................................................................... 14
7.5 Self assembly kit preparation ................................................................................................... 15
7.6 Assembly ................................................................................................................................ 16
7.7 Optional Components (not supplied) ........................................................................................ 17
7.8 Alternate assembly - low budget 4.5V battery powered setup ..................................................... 18
8.0 AXE405 PICAXE Proto Shield .................................................................................................... 19
8.1 Using the proto shield ............................................................................................................. 19
8.2 Using the proto shield with an XBee Wireless Module ................................................................ 20
Appendix A: Circuit Schematics - PICAXE and Download Circuits ....................................................... 21
Appendix B: Circuit Schematics - Power and optional EEPROM Circuits ............................................... 22
Appendix C: Dimensions ................................................................................................................ 23
Appendix D: What are the principle differences between using a PICAXE shield base and an Arduino? . 24
Appendix E: FAQ ........................................................................................................................... 26
FAQ - Can you provide a sewable ‘e-textiles’ version PICAXE controller like the Lilypad? ..................... 26
FAQ - I want to use a PIC microcontroller, but program it in assembler or C (or other language) instead

of using the PICAXE system. Can I do this? ................................................................................. 26

Please download the latest full assembly  instructions and datasheet from this web link:

www.rev-ed.co.uk/docs/axe401.pdf

Summary of Contents for AXE401

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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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