RP2040-ETH.md

Example code for RP2040-ETH in MicroPython

• examples from WaveShare wiki: Demo and MQTT

• Github examples by nichokap

• documentation by the chip manufacturer WCH

• download specs from here

The internal connection between CH9120 and RP2040:

CH9120 pins	RP2040 pins	Function
RXD	GP21	Serial data input
TXD	GP20	Serial data output
TCPCS	GP17	In TCP client mode, indicates connection status, low level for successful connection
CFG0	GP18	Network configuration enabled pin, low level for serial debugging mode
RSTI	GP19	Reset, active LOW

Code and documentation for Pico-ETH-CH9121

• WaveShare site and wiki and examples

• Github examples by Danielerikrust

• Github examples by Splashaudio