Gravity: I2C TO GPIO shield V2.0 (Discontinued)

PCA9555 port P0.5; DFRobot reference maps P0.0-P0.7 to GPIO 0-7 / ED0-ED7

PCA9555 port P0.6; DFRobot reference maps P0.0-P0.7 to GPIO 0-7 / ED0-ED7

PCA9555 port P0.7; DFRobot reference maps P0.0-P0.7 to GPIO 0-7 / ED0-ED7

PCA9555 port P1.0; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.1; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.2; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.3; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.4; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.5; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.6; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

PCA9555 port P1.7; DFRobot reference maps P1.0-P1.7 to GPIO 8-15 / ED8-ED15

I2C clock line from Arduino analog pin 5 per DFRobot product introduction

I2C data line from Arduino analog pin 4 per DFRobot product introduction

Module power supply input; DFRobot specification states module power supply +5 V

Common ground for Arduino shield and GPIO board