Pico W not reading GPIO24

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fantastic!! thank you so much, I was searching everywhere for this!

So my script is working correctly now and picking up the charging status…brilliant

I’m also trying to read the voltage input when the pico w is not plugged in via usb.
In theory I should be able to use Pin29 however this shows a very weird voltage (0.04V should be 3-4v), however after some googling it appears that pulling pin25 high corrects this

Pin(25, mode=Pin.OUT, pull=Pin.PULL_DOWN).high()

That works, but now that I am using your fix for usb detection it has stopped working.

the complete script I am running should display the charging voltage and battery level, or a ‘charging!’ status when it is plugged in.

It’s basically the script you have put together here pimoroni-pico/battery_pico.py at main · pimoroni/pimoroni-pico · GitHub … but it doesn’t seem to work for a pico w

so currently the script I have is this

# This example shows how to read the voltage from a LiPo battery connected to a Raspberry Pi Pico via our Pico Lipo SHIM
# and uses this reading to calculate how much charge is left in the battery.
# It then displays the info on the screen of Pico Display.
# Remember to save this code as main.py on your Pico if you want it to run automatically!

from machine import ADC, Pin
import time

# change to DISPLAY_PICO_DISPLAY_2 for Pico Display 2.0
from picographics import PicoGraphics, DISPLAY_PICO_DISPLAY
display = PicoGraphics(display=DISPLAY_PICO_DISPLAY, rotate=0)

display.set_backlight(0.5)

Pin(25, mode=Pin.OUT, pull=Pin.PULL_DOWN).high()
Pin(29, Pin.IN)
vsys = ADC(29)# reads the system input voltage

charging = Pin('WL_GPIO2', Pin.IN)  # reading GP24 tells us whether or not USB power is connected
conversion_factor = 3 * 3.3 / 65535

full_battery = 4.2                  # these are our reference voltages for a full/empty battery, in volts
empty_battery = 2.4                # the values could vary by battery size/manufacturer so you might need to adjust them

# Create some pen colours for drawing with
BLACK = display.create_pen(0, 0, 0)
GREY = display.create_pen(190, 190, 190)
GREEN = display.create_pen(0, 255, 0)
RED = display.create_pen(255, 0, 0)



while True:
    # convert the raw ADC read into a voltage, and then a percentage
    Pin(25, mode=Pin.OUT, pull=Pin.PULL_DOWN).high()
    voltage = vsys.read_u16() * conversion_factor
    percentage = 100 * ((voltage - empty_battery) / (full_battery - empty_battery))
    if percentage > 100:
        percentage = 100.00

    # draw the battery outline
    display.set_pen(BLACK)
    display.clear()
    display.set_pen(GREY)
    display.rectangle(0, 0, 220, 135)
    display.rectangle(220, 40, 20, 55)
    display.set_pen(GREEN)
    display.rectangle(3, 3, 214, 129)

    # draw a green box for the battery level
    display.set_pen(GREEN)
    display.rectangle(5, 5, round(210 / 100 * percentage), 125)

    # add text
    display.set_pen(RED)
    if charging.value() == 1:         # if it's plugged into USB power...
        display.text("Charging!", 15, 55, 240, 4)
    else:                             # if not, display the battery stats
        display.text('{:.2f}'.format(voltage) + "v", 15, 10, 240, 5)
        display.text('{:.0f}%'.format(percentage), 15, 50, 240, 5)

    display.update()
    time.sleep(0.5)