Data send-receive by IIC-bus Hardware: IIC-board with 4 x PCF8574 IC you see a 8bit leds this leds show the value from an other 8574 who has 8 switches as input The 8xswitches from IIC you can see also at the pins PC_0 to PC_7
IIC bus
The picture will show some Hardware with Nucleo Boards and IIC PCF8574 solutions:¶
Here you see a PDF with a picture and the code example:¶
/media/uploads/schlaumaier54/led_band8bitiic_analog_ein.pdf
Neumaier Feb 2018