01-01-2024, 05:51 AM
OK, if you really want to use KC868-A8 with big flash and PSRAM. you can replace with ESP32-WROOM-32E-N16R2.
just make sure let ESP32 IO16 should have a pull up resistance. it not use for any circuit. you can cut it, i have checked that have IO16 have connect with a pull up resistance and connect to PCF8574's "INT" pin. actually "INT" not need for PCF8574.
So i think if luckly, you can replace ESP32-WROOM-32E with ESP32-WROOM-32E-N16R2, then you can directly to use. if can't use by PSRAM, you can cut the PCB wire with PCF8574's "INT" pin.
just make sure let ESP32 IO16 should have a pull up resistance. it not use for any circuit. you can cut it, i have checked that have IO16 have connect with a pull up resistance and connect to PCF8574's "INT" pin. actually "INT" not need for PCF8574.
So i think if luckly, you can replace ESP32-WROOM-32E with ESP32-WROOM-32E-N16R2, then you can directly to use. if can't use by PSRAM, you can cut the PCB wire with PCF8574's "INT" pin.