What is the maximum voltage that the Stalker analog and digital inputs can accept? I made a shield that uses a TLC3702CP comparator chip to produce a 0 -5 vdc square wave signal. The board works good but when I connect the output to digital channel 3 (Interrupt 0) the signal is pulled down from 5 vdc to 3.8 vdc. I tried the shield and sketch on a Arduino Duemilanove and it worked with no problems.
From a earlier thread I know the output is 3.3 VDC but did not think it would affect the input. I tried a 470 ohm resistor between the comparator and Stalker and that kept the output signal of the comparator at 5 vdc with little drop on the Stalker side below the 3.8 vdc as seen without the resistor. If the Stalker can only accept 3.3 vdc signals, is there a safe way to connect 5 volt inputs?
Thanks in advance.