PICAXE Manual Section 1 - TechnoPujades - Free

www.picaxe.co.ukSection 1 14GETTING STARTEDWhich PICAXE chip?The PICAXE system can be used with different physicalsizes of PICAXE chip (8, 14, 18, 20, 28 and 40 pin). Theprimary difference between the sizes of chips is thenumber of input/output pins available – the larger chipscost a bit more but have more available input/output pins.The same BASIC language is common to all size chips.Within a chip size there are also differentvariants (e.g. for the 18 pin PICAXE the 18Mand 18X variants are available). Theprincipal difference between the variants isthe amount of memory (ie how long aprogram can be downloaded into the chip).The higher specification variants also havesome increased functionality (e.g. highresolution analogue inputs and i2ccompatibility, as described in the nextsection). Any project can be upgraded to thenext level variant at any point (e.g. if yourprogram is too long for the variant of chipused) by simply replacing themicrocontroller in your circuit with theupgraded variant. All upgraded variants arepin and program compatible with the lowerspecification device.+VSerial InIn 4 / Out4 / ADC4In3/Infrain+VSerial InADC 4 / Input 4Infrain / Input 3Input 2Input 1ADC 0 / Input 0+VSerial InInput 7Input 6Input 5Input 4ADC 3 / Input 3ADC 2 / Input 2ADC 1 / Input 1Infrain / Input 0PICAXE-08M12341234567PICAXE-20M123456789108765PICAXE-14M141312111098201918171615141312110VOut0 / Serial OutIn1 / Out1 / ADC1In2 / Out2 / ADC20VOut 0 / Serial OutOutput 1Output 2Output 3Output 4Output 50VSerial OutOutput 0 / InfraoutOutput 1Output 2Output 3Output 4Output 5Output 6Output 7The recommended part for new designs is:Educational:08 PICAXE-08M14 PICAXE-14M18 PICAXE-18M (also consider the 20M)20 PICAXE-20MStandard:18 PICAXE-18X28 PICAXE-28X140 PICAXE-40X1Advanced:20 PICAXE-20X228 PICAXE-28X240 PICAXE-40X2revolution(c) Revolution Education Ltd. Email: info@rev-ed.co.uk Web: www.rev-ed.co.ukVersion 6.9 07/2009All rights reserved.14