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PICAXE 28X2 module MCU Schematic
MCU = Micro Controller Unit

click on the image to enlarge

As you will note that PIN 1 is the upper left corner of the chip relative to the "U" gap or sometimes just a "DOT" in the upper left corner of a chip.

Vin = Battery or other Power IN to the PICAXE 28X2 module limited between 7V to 12V dc

d.c. or dc = Direct Current

V0 or 0V = Gnd. or Ground

PIN 25 the +5V DC PIN can also be the power pin to the module instead of PIN 28, but is limited to +4.5V to +5V DC . . . . . . . . . . This will run most lessons without any problems.

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