18M2 Motherboard

The 18M2 Motherboard is the controlling heart of an 18-pin PICAXE system to which other input and output interfaces connect.

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Schematic

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Motherboard test program

This simple test program will demonstrate that the 18M2 microcontroller is functioning. Shortly after download the Terminal display will appear and show a message indicating the 18M2 is working.

Code Example:
#picaxe 18M2
#terminal 4800

	pause 2000
main:	sertxd( "I'm your 18M2 microcontroller", cr, lf )
	pause 1000
	goto main
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Create Module

The 18M2 Motherboard is the main board to which other create input / output modules connect.

The motherboard contains a PICAXE-18M2 microcontroller, a 3.5mm jack socket download interface for loading programs into the 18M2 plus connections for a 4.5V battery power supply and 13 microbric connection points for other create modules. Programs are downloaded using the AXE027 USB serial cable. The motherboard has a switch to turn its power on and off and includes a LED to show when the board is powered.

For added short circuit protection in the educational environment each i/o pin also has an inline 220 ohm resistor - that is the reason for the extra two resistor array 'chips' seen on this motherboard!

For a moving 'robot' style motherboard for the create system the BOT120 motherboard kit (based around the PICAXE-20X2 microcontroller) will be of interest.

Bill of Materials

DescriptionCodeQty
PICAXE-18M2 microcontroller AXE015M2 1 Buy Now
18-pin 0.3" DIL IC socket ICH008 1 Buy Now
3.5mm stereo jack socket CON039 1 Buy Now
10k resistor (pack 100) RES10K 1 Buy Now
22k resistor (pack 100) RES22K 1 Buy Now
100nF miniature polyester capacitor CAP001 1 Buy Now

Simulation

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