I'm building an central ventilation control system. The ventilation motors are controlled by a third party tyristortransformer. This transformer accepts 0-5v as a control signal.
My plan is to have a iAQ-2000 or the k-30 sensor attached to arduino mega with PWM-protocol. Arduino software would look at the data and make changes to the voltage it's sending to the transformer.
I would also like to have a screen that would show numerical ppm value and percentage represeation of the voltage sent out. On the lower part of the screen, arduino would draw a line acording to the ppm value every 5 minutes. The GLCD model I'm considering is a 128x64 Graphic LCD with ST7920 controller. It would be connected trouhg a serial-protocol.
As i understand, this screen divides in to two sections, one and two. You could wipe or redraw the upper (one) with out affecting the lower (two) part of the screen? After reading the library definitions, I now know how I would draw the line, but I don't know if it's possible to scroll the lower screen to the left everytime a new line is drawn?
Here are my questions: Is the mega a good choice for that screen? Is that screen a good coice for this aplication? Would it be possible to do that line graph with this screen and/or arduino mega?