(PCB) Auto bed leveling using piezo discs

Remixed from the Thing http://www.thingiverse.com/thing:707392 by elenhinan.

Attached files are Eagle CAD schematic and board design files.

BOM:
Part Value Package

C1 100nF C2012
C2 1nF C2012
C3 1uF C2012
C4 100nF C2012
C5 10uF SMC_D (D type tantal cap)
C6 100nF C2012
C7 100nF C2012

R1 6k8 R2012 resistor
R2 6k8 R2012 resistor
R3 1M R2012 resistor
R4 33k R2012 resistor
R5 1M R2012 resistor
R6 10k R2012 resistor
R7 10k R2012 resistor
R8 330 R2012 resistor

R9 10K RTRIM3314G rcl ( Bourns 3314G Series-10KΩ)


D1 1N4733A DO41Z10
D2 1N4733A DO41Z10

IC1 AD822R SO8