04-04-2023, 10:51 PM
Can anybody help me with information relating to the ESP32 GPIO pin used to connect the IRQ (nINT) from the PCF8574 (Digital inputs 1 to 6).
I need to be able to capture very irregular (maybe 10 per minute) but short pulses (< 10mS duration) pulses without missing any.
I would hate to have to schedule I2C reads every 5mS or less to make sure nothing is missed.
I have had a look at the KC868-A4 schematic and the DI1-DI4 pins are directly GPIO connect, not through a PCF8574 GPIO extender.
I need to be able to capture very irregular (maybe 10 per minute) but short pulses (< 10mS duration) pulses without missing any.
I would hate to have to schedule I2C reads every 5mS or less to make sure nothing is missed.
I have had a look at the KC868-A4 schematic and the DI1-DI4 pins are directly GPIO connect, not through a PCF8574 GPIO extender.