am just taking the first few steps along the path of pi tinkering and am working on a small project which is intended as a gift for a friend and i’d like to wire in a power button so they have control over when it is switched on as it’ll be enclosed in a case making plugging/unplugging difficult unless from the wall outlet.
currently I am using a small 4in lcd display from waveshare to output from the pi and this will be built into casing too.
doing some reading on the onoff shim i gather it uses pins 7 (bcm 4) and 11 (bcm 17) and there is potential for weird things to happen if other inputs/outputs are using those pins as well.
the specs for my display (from here: https://www.waveshare.com/product/4inch-rpi-lcd-a.htm) are as follows:
PIN NO. SYMBOL DESCRIPTION 1, 17 3.3V Power positive (3.3V power input) 2, 4 5V Power positive (5V power input) 3, 5, 7, 8, 10, 12, 13, 15, 16 NC NC 6, 9, 14, 20, 25 GND Ground 11 TP_IRQ Touch Panel interrupt, low level while the Touch Panel detects touching 18 LCD_RS Instruction/Data Register selection 19 LCD_SI / TP_SI SPI data input of LCD/Touch Panel 21 TP_SO SPI data output of Touch Panel 22 RST Reset 23 LCD_SCK / TP_SCK SPI clock of LCD/Touch Panel 24 LCD_CS LCD chip selection, low active 26 TP_CS Touch Panel chip selection, low active
which looks like pin 11 (BCM 17) clashes with their touch panel interrupt, is that correct?
if so, the screen will be behind glass anyways so will not be touchable so do you guys think i may get away with it?
thanks in advance :)