Want to build your own?

The EAUduino was designed with 100% through-hole construction, so it is easily duplicated.

The circuit board was designed using ExpressPCB, which is available for free from expresspcb.com. This software is incredibly easy to use, and our design team even got it working on Linux via Wine! Here is the ExpressPCB file for the EAUduino.

Admittedly, there is a downside to using ExpressPCB... Because it locks you into their fabrication service and pricing models. For our purposes, this works just fine -- but for yours it may not.

So ... if you are good with EAGLE, here is the schematic in EAGLE format: EAUduino.sch

Eagle will let you play with the design infinitely so you can come up with an entirely different board if you'd like.

If you just want to see the schematic without fooling around with CAD software, here it is: EAUduinoSchematic.png

Of course, the circuit board is only part of the equation! You'll also need all the parts. The parts come from Mouser, Digikey and All Electronics. Each part in the following list is linked to the distributor. You'll probably find that for just one or two of these, it is cheaper just to buy pre-made from our distributor.

Parts List

1 X LM2931Z LDO Voltage Regulator, TO-92

1 X ATMega168-20PU AVR Microcontroller, 28-pin PDIP

1 X ULN2803AN Darlington Array Driver, 18-pin PDIP

1 X DS1337+ Real Time Clock, 8-pin PDIP

1 X 74HC14N Hex inverting Schmitt trigger, 16-pin PDIP

1 X 32.768khz Crystal

1 X 16Mhz Ceramic Resonator

3 X I Kohm 1/4 watt resistor

4 X 10 Kohm 1/4 watt resistor

1 X 1 Mohm 1/8 watt resistor

5 X .1 uF 50V ceramic capacitor (.2" lead spacing)

2 X .1uF 50V ceramic capacitor (.1" lead spacing)

2 x 47uF Radial Electrolytic Capacitor, 50V

1 X Green LED, 3mm

6 x 2-pin Connector w/Header, .10"

1 X Single Row Header, 1x40 .10" (These are snapped off in groups of three.)

1 X 2x12 Snappable Header, 0.1" (These are snapped off in groups of three)

1 X Tactile Switch