Generic PCBs

There are some generic PCBs which are used for different devices. The goal is to reuse few PCB types many times instead of developing special ones for each device.

Here are the specs for the PCBs:

	Generic Maxi Speed	Generic Maxi	Generic Midi	Generic Micro
Purpose	This board has dual voltage support and an optional crystal to make it possible to run the microcontroller at its full speed of 20 MHz. Full description	This board offers the maximum amount of connections. It can be used as experimental board or for a device with many functions.	This board offers a mediocre amount of connections with a reasonable small size. No SMD-soldering is needed (except the RFM12 mounting).	This SMD PCB can be integrated in e.g. existing home appliances because of the small form factor. Experience in soldering is needed.
Sample Appliances	base station	multi-relais switch weather station	temperature sensor power socket	power socket heating control
Picture
Size	50 x 50 mm (25 cm²) 2 x 2 in (4 in²)	76 x 48 mm (36.5 cm²) 2.1 x 1.9 in (5.7 in²)	48 x 45 mm (21.6 cm²) 1.9 x 1.8 in (3.3 in²)	35 x 30 mm (10.5 cm²) 1.4 x 1.2 in (1.6 in²)
Type	conventional THTThrough hole technology This is the conventional technique to stick pins of components through the PCB and solder them. This is easy to build up, unlinke using SMD components.	conventional THT	conventional THT	SMDSurface-mounted device Using this technique, the components are soldered directly to the surface of the PCB. The components are often very small. Their pin pitch is also small. Building up these devices needs some experience in soldering.
Clock Source	optional crystal	optional crystal	internal RC oscillator only	internal RC oscillator only
I/O Pins	8	14	8	8
Assembly Options	Crystal, voltage measurement, reset button and others	Crystal	Voltage measurement	3.3V voltage regulator for both ATMega and RFM12
Links	Schematics + Layout at GitHub	Schematics + Layout at GitHub	Schematics + Layout at GitHub	Schematics + Layout at GitHub