The 18M2 Motherboard is the controlling heart of an 18-pin PICAXE system to which other input and output interfaces connect.
18M2 Motherboard
Schematic
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PCB
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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:
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#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
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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
Description | Code | Qty | |
---|---|---|---|
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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