First is something to do the digital-to-analog conversion. The application, as written, is build for an ES9023 DAC, but basically anything that speaks I2S should be workable with only a little bit ...

We’ve seen a lot of ESP8266 projects in the past, but this one most definitely qualifies as a hack. [Cnlohr] noticed that the ESP8266, when overclocked, could operate the I2S port at around 8… ...

It is equipped with 32 Inputs (16 x digital 4-30V, 8 x analog 0-10V, 4 x analog 0-5V, 4 x analog 4-20mA) and 20 Outputs (8 x relay 250V/5A, ... ESP8266 based Wi-Fi and I2C bus for sensors or ...

The self-contained ESP8266 SoC integrates a TCP/IP protocol stack for connecting to a Wi-Fi network or acting as an access point. ... The board supports an operating voltage of 3.3V and offers 54 ...