the adc is done by a seperate chip on the daughter board. the adc is spi, the lcd is spi, and the sd is spi. there is no other way to have reliable adc signals and have the touch display work without a stylus. currently it works by finger touch alone.
currently there is a 4066 4 channel analog switch used, but i may drop that chip to simplify the design. can you tell me why it would be good to have separate adc channels on the lcd daughter board (edit) besides what is used for touch controller functions? (edit) and if so i have 4 channels available, but can have up to 8 because it requires its own 8 bit shift register.
The 4066 is cheap enough, but it takes up board space, and complicates the drawing of circuits for repraps. the drawing for reprap is another headache as I normally would use the toner transfer method, but the traces normally are 1/64 (0.4mm) or 1/32 (0.8mm). I'm trying to keep traces wide at 1.5mm or 2mm.
I guess it couldn't hurt. I'll add in a space for the extra 4066 chip. it may not be included. but the space and holes will be there to solder it in....
so is 4 extra adc enough?
currently there is a 4066 4 channel analog switch used, but i may drop that chip to simplify the design. can you tell me why it would be good to have separate adc channels on the lcd daughter board (edit) besides what is used for touch controller functions? (edit) and if so i have 4 channels available, but can have up to 8 because it requires its own 8 bit shift register.
The 4066 is cheap enough, but it takes up board space, and complicates the drawing of circuits for repraps. the drawing for reprap is another headache as I normally would use the toner transfer method, but the traces normally are 1/64 (0.4mm) or 1/32 (0.8mm). I'm trying to keep traces wide at 1.5mm or 2mm.
I guess it couldn't hurt. I'll add in a space for the extra 4066 chip. it may not be included. but the space and holes will be there to solder it in....
so is 4 extra adc enough?