Raspberry Pi Pico W OLED

Some components arrived from AliExpress recently, so been able to play with an I2C OLED display with my Pico W.

Hello World

Code of this is here,

import machine
import ssd1306

sda = machine.Pin(0)
scl = machine.Pin(1)
i2c = machine.I2C(0, sda=sda, scl=scl, freq=400000)
print("Scanning for IC2 devices")
devices = i2c.scan()
if len(devices) == 0:
    print("No i2c Devices found.")
else:
    for device in devices:
        print("Decimal address: ", device, " | Hexa address: ", hex(device))
    display = ssd1306.SSD1306_I2C(128, 64, i2c)
    display.text("Hello World", 0, 0)
    display.show()

https://github.com/alastairhm/pico_w/blob/main/i2c_scan.py

And also used here to display the IP address after connected to the Wi-Fi

import machine
import ssd1306
import time
import network


def wifi_connection(file, max):
    """Connect to Wifi"""

    ip = "Not Connected"
    f = open(file, "r")
    wifi_details = f.readline()
    f.close()

    ssid = wifi_details.split(" ")[0]
    password = wifi_details.split(" ")[1]

    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)

    # Wait for connect or fail
    print("Connection to", ssid)
    max_wait = max
    while max_wait > 0:
        if wlan.status() < 0 or wlan.status() >= 3:
            break
        max_wait -= 1
        print("waiting for connection...")
        time.sleep(1)

    # Handle connection error
    if wlan.status() != 3:
        raise RuntimeError("network connection failed")
    else:
        print("connected")
        ip = wlan.ifconfig()[0]
        print("ip = " + ip)
    return ip


def setup_display(sda, scl, x=128, y=64, freq=400000):
    """Setup I2C Display"""
    i2c = machine.I2C(0, sda=sda, scl=scl, freq=freq)
    return ssd1306.SSD1306_I2C(x, y, i2c)


def update_display(display, lines, y_offset=2):
    """Update the Display"""
    clear_display(display)
    frames = [[0,0,128,16,1],[0,17,127,46,1]]
    draw_frames(frames)
    y = y_offset
    for line in lines:
        display.text(line, 1, y)
        y += 16
    display.show()

def clear_display(display):
    """Clear the display"""
    display.fill(0)
    display.show()

def draw_frames(display, frames):
    """Draw frames on display"""
    for frame in frames:
        display.rect(frame[0], frame[1], frame[2], frame[3], frame[4])


if __name__ == "__main__":
    sda = machine.Pin(0)
    scl = machine.Pin(1)
    display = setup_display(sda, scl)
    update_display(display, ["Connecting..."])
    ip_address = wifi_connection("wifi.txt", 10)
    lines = [ip_address, "Hello", "World"]
    update_display(display, lines)

https://github.com/alastairhm/pico_w/blob/main/wifi_oled.py

Next thing I’ve been playing with is internal and external temperature sensors, I will post about that soon.