Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at
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Micropython I2C-based manipulation of the MCP series GPIO expander, derived from Adafruit_MCP230xx
Micropython library for using the MCP23S17 16-bit IO expander with the ESP8266
MicroPython Library to use pcf8591 i2c analog IC with Arduino, Raspberry Pi Pico and rp2040 boards, esp32, SMT32 and ESP8266. Can read analog value and write analog value with only 2 wire.