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PICaxe 18X
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 18X is one of the 18 pin devices (based upon the PIC16F88). It allow user generated programs, upto 600 lines of BASIC, to be downloaded using a simple RS-232 serial connection.  The 18X, as standard, gives access to 5 Input (inc. three ADC) and 8 Outputs, however these can be modified or re-configured using suitable PEEK/POKE commands. An example can be found here:- Reconfiguring PICaxe IO• ADC - Analogue to Digital Converter • i2c scl / sda - Allows interface to I2C devices • Infrain - Infra-red input (TV Controller) • Keyboard Data / Clock - Allows PC Keyboard Interface • PWM - Pulse Width Modulation • Serial In / Out - Programming Interface  The minimum circuitry for the 18X 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. The reset circuitry requires a resistor and a push button switch, as shown. 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) : 200mA Current "sunk through chip" is the current out of VSS (0V) : 200mA Sourced or sunk through all ports combined : 100mA Sourced or sunk per pin : 25mA |
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