Top 3 expander open source projects

Library to use i2c digital expander with arduino, esp8266 and esp32. Can read write digital value with only 2 wire (perfect for ESP-01).

i2c digital expander for Arduino, esp32, SMT32 and ESP8266. Can read write digital values with only 2 wire. Very simple to use and encoder support.

Library to use i2c analog IC with arduino and esp8266. Can read analog value and write analog value with only 2 wire (perfect for ESP-01).