Pinout

We start by connecting the Grow r503 (Pro) to the RP2040 Pico W with the following pinout.

#	Sensor Wire Color	Function	PIN#	Pin Name
1	$${\color{red}RED \space Wire}$$	Power	36	$${\color{red}3V3(OUT)}$$
2	$${\color{white}WHITE \space Wire}$$	Ground	38	$${\color{black}GND}$$
3	$${\color{yellow}YELLOW \space Wire}$$	TX (Out)	21	$${\color{purple}UART0 \space RX (GPIO 17)}$$
4	$${\color{purple}PURPLE \space Wire}$$	RX (In)	22	$${\color{purple}UART0 \space TX (GPIO 16)}$$
5	$${\color{blue}BLUE \space Wire}$$	Wakeup	24	$${\color{lightgreen}GPIO 18}$$
6	$${\color{white}WHITE \space Wire}$$	Touch	36	$${\color{red}3V3(OUT)}$$