So no schematic?
It looks like the pin 1 of the PCF8575 has a trace going to R80.
The other side of R80 looks to be tied to 3.3v as a pull-up.
Just checking.
Also, to find a convenient free IO pin, I noticed in the pin document page that it shows GPIO5 in two places:
SD Card:
SPI-MOSI:GPIO10
SPI-SCK:GPIO11
SPI-MISO:GPIO12
SPI-CS:GPIO9
SPI-CD:GPIO5
--------------------
RF433M sender:GPIO4
RF433M receiver:GPIO5
If this board does not use RF433M, should that mean that GPIO4 is really free?
Edit- looking at the ESP32 data sheet, it looks like pin 4 might not be a good choice anyway (strapping pin), looks like GPIO6 would be good.
Thank You
It looks like the pin 1 of the PCF8575 has a trace going to R80.
The other side of R80 looks to be tied to 3.3v as a pull-up.
Just checking.
Also, to find a convenient free IO pin, I noticed in the pin document page that it shows GPIO5 in two places:
SD Card:
SPI-MOSI:GPIO10
SPI-SCK:GPIO11
SPI-MISO:GPIO12
SPI-CS:GPIO9
SPI-CD:GPIO5
--------------------
RF433M sender:GPIO4
RF433M receiver:GPIO5
If this board does not use RF433M, should that mean that GPIO4 is really free?
Edit- looking at the ESP32 data sheet, it looks like pin 4 might not be a good choice anyway (strapping pin), looks like GPIO6 would be good.
Thank You