Coper
Member level 4
I am thinking about how to easily and cheaply control 8 relays (5 or 12 or 24 V) via I2C.
My first choice, I2C port expander PCF8574 and some transistor array. Unfortunately the PFC8574 has a Hi output after reset and NPN darlingtor or N Mosfet array switch relay on during system boot.
Can anyone think of an elegant solution?
My first choice, I2C port expander PCF8574 and some transistor array. Unfortunately the PFC8574 has a Hi output after reset and NPN darlingtor or N Mosfet array switch relay on during system boot.
Can anyone think of an elegant solution?