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PICaxe 20X2
The official support forum can be found here www.picaxeforum.co.uk and includes links to documentation and programming software. The PICaxe is a micro controller based on a range of Microchip PICs. There are a number of PICaxe variants of differing pin counts, the 20X2 is one of the 20 pin devices (based upon the PIC18F14K22). It allow user generated programs to be downloaded using a simple RS-232 serial connection, from the Pins shown be low you can see there's quite a variety of options for I/O.  • ADC - Analogue to Digital Converter • i2c scl / sda - Allows interface to I2C devices • Infrain - Infra-red input (TV Controller) • Kb Data / Clock - Allows PC Keyboard Interface • PWM - Pulse Width Modulation • Serial In / Out - Programming Interface  The minimum circuitry for the 20X2 is quite minimal, the download circuit needs just two resistors and a connector. We'd recommend a stereo jack to match Rev-Ed's Serial (AXE026) and USB (AXE027) cables but cables can be easily constructed to work with either serial ports. Where a jumper is used, Pin 19 can be switched between use as the serial output and other functions. The current handling capabilities of PICAXE chips is taken from the Microchip datasheets. This may be subject to change or re-rating, always check the latest datasheets before use. Current "sourced through chip" is the current into VDD (+V) : 250mA Current "sunk through chip" is the current out of VSS (0V) : 300mA Sourced or sunk through all ports combined : 200mA Sourced or sunk per pin : 25mA |
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