Comments on: Raspberry Pi Pico and Pico W Pinout Guide: GPIOs Explained

By: Kees

Kees — Tue, 04 Mar 2025 20:40:04 +0000

Dear Rui and Sara,

On your page https://randomnerdtutorials.com/raspberry-pi-pico-w-pinout-gpios/#i2c in the text above the table you write I2C1 and I2C2 and in the table below that text I read I2C0 and I2C1 in the table. May I suppose that I2C1 in the text is the same as I2C0 in the table and I2C2 is the same as I2C1 in the table?

By: Karin Willers

Karin Willers — Thu, 12 Dec 2024 21:54:55 +0000

In reply to Karin Willers.

I did adapt code from github.com/raspberrypi/pico-examples/blob/master/blink/blink.c
for the Raspberry Pi Pico W and 2 W. Tested on Pico 2 W under Arduino IDE version 1.8.19:

/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Arduino version by Karin Willers
*/

// Pico W devices use a GPIO on the WIFI chip for the LED,
// so when building for Pico W, CYW43_WL_GPIO_LED_PIN will be defined

#ifdef CYW43_WL_GPIO_LED_PIN
#include “pico/stdlib.h”
#include “pico/cyw43_arch.h”
#endif

#ifndef LED_DELAY_MS
#define LED_DELAY_MS 1000
#endif

// Perform initialization
void setup() {
#if defined(CYW43_WL_GPIO_LED_PIN)
// For Pico W devices we need to initialise the driver etc.
cyw43_arch_init();
#else
pinMode(LED_BUILTIN, OUTPUT);
#endif
}

// Turn the led on or off
void pico_set_led(bool led_on) {
#if defined(CYW43_WL_GPIO_LED_PIN)
// Ask the wifi “driver” to set the GPIO on or off
cyw43_arch_gpio_put(CYW43_WL_GPIO_LED_PIN, led_on);
#else
// Just set the GPIO on or off
digitalWrite(LED_BUILTIN, led_on);
#endif
}

void loop() {
pico_set_led(true);
delay(LED_DELAY_MS);
pico_set_led(false);
delay(LED_DELAY_MS);
}

By: Karin Willers

Karin Willers — Tue, 10 Dec 2024 17:23:37 +0000

The builtin LED on the Pico W and 2 W is not connected to GPIO pin LED_BUILTIN. Instead the LED is connected to the CYW43439KUBG WLAN chip via signal WL_GPIO0.
The standard Arduino IDE blink code, which uses LED_BUILTIN does not work.

By: Nick Carter

Nick Carter — Sat, 08 Jun 2024 23:58:50 +0000

I looked at the RPi website electrical specs for the board but was unable to find the current voltage min/max for the GPIOs in/out. Do I have to go all the way to the M0 chip manufacturer specs to find that?
If I am hooking components up to it I would want to know that.

By: Milan Bartak

Milan Bartak — Mon, 22 Jan 2024 10:40:30 +0000

Hi,
thank you for nice tutorial.

Do you think that it would be possible to use same libraries as for Arduino UNO.
For example if I would like to have it connected with ETHERNET SHIELD W5100, AUDIO SHIELD VS 1053 B (and create simple internet radio)

Best Regards,
Milan

By: Sara Santos

Sara Santos — Fri, 12 Jan 2024 17:55:31 +0000

In reply to Terry Rowland.

Hi.
Yes, the frequency is adjustable. You can check this tutorial: https://randomnerdtutorials.com/raspberry-pi-pico-pwm-micropython/
Regards,
Sara

By: Terry Rowland

Terry Rowland — Fri, 12 Jan 2024 16:42:22 +0000

Hello Sarah,
I am looking at this board as I am fed up with restrictions on use of IO pins and PWM frequencies on arduino nano, 8266 and esp32.

No mention of 5v tolerance, what is maximum digital input voltage?

Is the PWM frequency adjustable?

Thanks.
Terry R.

By: Sara Santos

Sara Santos — Fri, 18 Aug 2023 09:20:06 +0000

In reply to Michael.

Hi.
Yes.
You’re right.
I don’t know why the official pinout shows GPIO 0.
Regards,
Sara

By: Michael

Michael — Thu, 17 Aug 2023 19:22:41 +0000

Hi Sara,
here a comment on the built-in LEDs:
The command => Serial.print(LED_BUILTIN); <= corectly reproduces the GPIO25 for the Pico-board, but in my case shows the GPIO32 for the PicoW-board. GPIO0 would conflict with UART0 anyway.
By the way, UART0 (TX => GPIO0, RX => GPIO1) is only accessed through “Serial1”. The simple “Serial” represents the connection to the USB connector.
Best regards.

By: Sara Santos

Sara Santos — Sat, 12 Aug 2023 09:51:47 +0000

In reply to Mike Fontes.

Hi.
Unfortunately, I’m not familiar with that subject.
Regards,
Sara