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cheap Arduino based programmable logic controller

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coromonadalix:
Seems nice to me, a small comment would be:   input protection for the analog ports, something like tvs tds surge supressors or even zenners ??? since the mega analog inputs are 3.3v if i recall ??

universal-solder:
The analog inputs on the Atmega are limited to supply voltage, which is 5V on the MEGA2560 board. The chip has diodes on the inputs, to drain higher voltages on the puts to ground. These diodes can handle max. 1mA, and we use a voltage divider made of 2 x 27k on the analog pins, to achieve the 0-10V range, and to limit the input current. That way, the analog inputs can easily handle the 24V power supply level on them without damage (safe limit is 30V).

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