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 ...

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

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.