You want to continuously display live temperature readings from a sensor on an OLED screen using Python. Which approach correctly updates the display every second without flickering?

hard🚀 Application Q15 of 15

Raspberry Pi - Display and Output

import time
while True:
    temp = read_sensor()
    image = Image.new('1', (disp.width, disp.height))
    draw = ImageDraw.Draw(image)
    draw.text((0, 0), f'Temp: {temp}C', font=font, fill=255)
    disp.image(image)
    disp.display()
    time.sleep(1)

What is the best improvement to reduce flicker?

AClear the display before drawing each new image

BCreate the image and draw objects once outside the loop and reuse them

CRemove time.sleep(1) to update faster

DUse disp.clear() after disp.display() inside the loop

Step-by-Step Solution

Solution:

Step 1: Understand flicker cause
Creating new image and draw objects each loop causes flicker due to redraw overhead.
Step 2: Optimize by reusing objects
Creating image and draw once outside loop and clearing draw area inside loop reduces flicker.
Final Answer:
Create the image and draw objects once outside the loop and reuse them -> Option B
Quick Check:
Reuse image/draw objects to reduce flicker [OK]

Quick Trick: Create image/draw once outside loop to avoid flicker [OK]

Common Mistakes:

MISTAKES

Recreating image each loop causing flicker
Removing sleep causing too fast updates
Calling disp.clear() after display has no effect

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You want to continuously display live temperature readings from a sensor on an OLED screen using Python. Which approach correctly updates the display every second without flickering?

Step 1: Understand flicker cause

Step 2: Optimize by reusing objects

Final Answer:

Quick Check:

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