I have a Mega128 controlling a Hantronix 2X8 LCD. I was wondering how to control the LCD pin. When it it cold or hot, the LCD is unreadable. The problem is that I cannot use a trimpot because the user would have to open the case each time. Is there a rogue cheap way you guys do this? Perhaps a thermistor somehow in line with the divider gthat sets up he contrast voltage? I was thinking, if the Mega had a D/A, that would work, but it does not know the temp and I have no temp sensor on the board. Any idea's?