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					18 lines
				
				788 B
			
		
		
			
		
	
	
					18 lines
				
				788 B
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											10 years ago
										 
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								# Techkeys SixKeyBoard
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								[Get one here!](http://techkeys.us/collections/accessories/products/sixkeyboard)
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								The schematic is like this:
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								```
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								 switches       leds
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								,--+--+--.   ,--+--+--.
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								|C7|B7|B5|   |C6|B6|B4|
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								+--+--+--+   +--+--+--+
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								|D6|D1|D4|   |D5|D2|D3|
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								`--+--+--'   `--+--+--'
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								```
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								The LED on the bottom is `C4`. All 7 of the leds are turned on when the keyboard boots-up in the `sixkeyboard.c` file - backlight_enable is not required. The MCU is an Atmega16u2, so the flash memory is limited to 0x3000 bytes - the current setup uses just about all of that! I'm sure things can be opitimised a bit.
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								There is a jumper on the bottom of the board (next to the USB port) that serves as a reset button - I drilled a hole in my case to allow for quick access via a screwdriver/metal object.
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