I did the same with the thermistor and photoresistor, but connected those to pin A1 and pin A2, respectively.

The first jumper (J1) is for write protection (WP) which can enable or disable the microcontroller writing data to the EEPROM chip, while the next three jumpers (J2-J3-J4) are address input pins ...

The A2 and A1 bits are hard-wired during manufacturing, and the A0 bit is determined by the logic state of the user-configurable A0 pin. The A0 pin can be connected to VCC or GND or actively driven by ...

Enter the ExtraCore library for Arduino, a software library that turns two or more Arduinos into a multi-core microcontroller with more pins than you’ll ever need.