1.1 Revolution Education Ltd PICAXE-28X2 2010-05-26 PICAXE DIP Microcontroller Board (PICAXE) PICAXE-28X2 THT PICAXE-28X2 from Revolution Education Ltd Connect via a 4K7 resistor to the positive rail of the power supply in your circuit. This pin must be connected via the 4K7 resistor or the PICAXE will not operate correctly. This pin can also be connected to a switch to 0V (ground) to provide a manual 'reset button' for the PICAXE

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input for the internal 'C1' comparator

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input for the internal 'C2' comparator

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input for the internal 'C1' comparator

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input for the internal 'C2' comparator

Connect to the 22K resistor of the PICAXE download circuit

Connect to the output pin of the download connector for the PICAXE download circuit. This pin can also be used as an independent digital output

Connect to the 0V (ground) of the power supply in your circuit

Connect to a resonator or crystal if you wish to use one. The PICAXE will operate without a resonator or crystal connected

Connect to a resonator or crystal if you wish to use one. The PICAXE will operate without a resonator or crystal connected

This pin can be used as a digital input and a digital output. This pin can be used to increment the internal 'timer' variable of the PICAXE

This pin can be used as a digital input and a digital output. This pin can be used to generate a background PWM output signal using the PWMOUT command

This pin can be used as a digital input and a digital output. This pin can be used to generate a background PWM output signal using the PWMOUT command

This pin can be used as a digital input and a digital output. If using the PICAXE with I2C devices this pin should connect to the 'I2C Clock' (SCL) pins of those devices and a 4K7 resistor should connect from this pin to the positive rail of the power supply in your circuit. If using the PICAXE with SPI devices this pin should connect to the 'SPI Clock' (SCK/SCLK) pins of those devices

This pin can be used as a digital input and a digital output. If using the PICAXE with I2C devices this pin should connect to the 'I2C Data' (SDA) pins of those devices and a 4K7 resistor should connect from this pin to the positive rail of the power supply in your circuit. If using the PICAXE with SPI devices this pin should connect to the 'SPI Data Out' (DO/DOUT/SO) pins of those devices

This pin can be used as a digital input and a digital output. If using the PICAXE with SPI devices this pin should connect to the 'SPI Data In' (DI/DIN/SI) pins of those devices

This pin can be used as a digital input and a digital output. This pin can be used to output high-speed serial data. If using the PICAXE with a PS/2 keyboard this pin should connect to the 'PS/2 Keyboard Clock' signal ( pin 5 on a PS/2 mini-DIN connector ) and a 4K7 resistor should connect from this pin to the positive rail of the power supply in your circuit

This pin can be used as a digital input and a digital output. This pin can be used to receive high-speed serial data. If using the PICAXE with a PS/2 keyboard this pin should connect to the 'PS/2 Keyboard Data' signal ( pin 1 on a PS/2 mini-DIN connector ) and a 4K7 resistor should connect from this pin to the positive rail of the power supply in your circuit

Connect to the 0V (ground) of the power supply in your circuit

Connect to the positive rail of the power supply in your circuit

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input trigger to initiate a 'hardware interrupt'

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input trigger to initiate a 'hardware interrupt'

This pin can be used as a digital input and a digital output or can be used as an analogue input. This pin can be used as an input trigger to initiate a 'hardware interrupt'

This pin can be used as a digital input and a digital output or can be used as an analogue input

This pin can be used as a digital input and a digital output or can be used as an analogue input

This pin can be used as a digital input and a digital output

This pin can be used as a digital input and a digital output

This pin can be used as a digital input and a digital output