4 replies

How to Display Warnings on OLED Based on Object Distance Using BeagleBone Black?

Hey guys, still based on my project parking assistance system using a

BeagleBone Black

BeagleBone Black

running Embedded Linux,

VL53L0X

VL53L0X

time of flight distance sensor to detect the distance to nearby objects and a

0.96-inch OLED

0.96-inch OLED

display to show the distance and warning messages. how can I display warning messages on the

OLED

OLED

screen when the detected object is too close or too far. i am getting the error

Error: Display not updating

Error: Display not updating

i have verified timing of the

time.sleep()

time.sleep()

function, ensured proper buffer clearing with

disp.clear()

disp.clear()

but still getting same error.

here's my code

import board
import busio
import adafruit_vl53l0x
from Adafruit_SSD1306 import SSD1306_128_64
import time

# Initialize I2C bus and devices
i2c = busio.I2C(board.SCL, board.SDA)
vl53 = adafruit_vl53l0x.VL53L0X(i2c)
disp = SSD1306_128_64(rst=None)
disp.begin()
disp.clear()
disp.display()

while True:
    distance = vl53.range
    print(f"Distance: {distance} mm")

    disp.clear()
    if distance < 100:
        disp.text("Warning: Too Close!", 0, 0, 1)
    elif distance > 2000:
        disp.text("Warning: Too Far!", 0, 0, 1)
    else:
        disp.text(f"Distance: {distance} mm", 0, 0, 1)
    disp.display()

    time.sleep(1)

import board
import busio
import adafruit_vl53l0x
from Adafruit_SSD1306 import SSD1306_128_64
import time

# Initialize I2C bus and devices
i2c = busio.I2C(board.SCL, board.SDA)
vl53 = adafruit_vl53l0x.VL53L0X(i2c)
disp = SSD1306_128_64(rst=None)
disp.begin()
disp.clear()
disp.display()

while True:
    distance = vl53.range
    print(f"Distance: {distance} mm")

    disp.clear()
    if distance < 100:
        disp.text("Warning: Too Close!", 0, 0, 1)
    elif distance > 2000:
        disp.text("Warning: Too Far!", 0, 0, 1)
    else:
        disp.text(f"Distance: {distance} mm", 0, 0, 1)
    disp.display()

    time.sleep(1)

Solution

Hey @Boss lady It looks like you’ve got most things set up correctly. The

issue

issue

with the display not updating is due to how the text is being rendered on the

OLED

OLED

screen, you could try making sure that each

frame

frame

is being drawn correctly before it’s

sent

sent

to the

display

display

. The

Adafruit_SSD1306

Adafruit_SSD1306

library has some

quirks

quirks

with the

text()

text()

method, and sometimes it doesn't update the display as expected. So try modifying your code to use the Image and ImageDraw modules to draw the text on a buffer before displaying it

Jump to solution

DIIS

DevHeads IoT Integration Server•2y ago•

4 replies

Boss lady

How to Display Warnings on OLED Based on Object Distance Using BeagleBone Black?

Hey guys, still based on my project parking assistance system using a

BeagleBone Black

BeagleBone Black

running Embedded Linux,

VL53L0X

VL53L0X

time of flight distance sensor to detect the distance to nearby objects and a

0.96-inch OLED

0.96-inch OLED

display to show the distance and warning messages. how can I display warning messages on the

OLED

OLED

screen when the detected object is too close or too far. i am getting the error

Error: Display not updating

Error: Display not updating

i have verified timing of the

time.sleep()

time.sleep()

function, ensured proper buffer clearing with

disp.clear()

disp.clear()

but still getting same error.

here's my code

import board
import busio
import adafruit_vl53l0x
from Adafruit_SSD1306 import SSD1306_128_64
import time

# Initialize I2C bus and devices
i2c = busio.I2C(board.SCL, board.SDA)
vl53 = adafruit_vl53l0x.VL53L0X(i2c)
disp = SSD1306_128_64(rst=None)
disp.begin()
disp.clear()
disp.display()

while True:
    distance = vl53.range
    print(f"Distance: {distance} mm")

    disp.clear()
    if distance < 100:
        disp.text("Warning: Too Close!", 0, 0, 1)
    elif distance > 2000:
        disp.text("Warning: Too Far!", 0, 0, 1)
    else:
        disp.text(f"Distance: {distance} mm", 0, 0, 1)
    disp.display()

    time.sleep(1)

import board
import busio
import adafruit_vl53l0x
from Adafruit_SSD1306 import SSD1306_128_64
import time

# Initialize I2C bus and devices
i2c = busio.I2C(board.SCL, board.SDA)
vl53 = adafruit_vl53l0x.VL53L0X(i2c)
disp = SSD1306_128_64(rst=None)
disp.begin()
disp.clear()
disp.display()

while True:
    distance = vl53.range
    print(f"Distance: {distance} mm")

    disp.clear()
    if distance < 100:
        disp.text("Warning: Too Close!", 0, 0, 1)
    elif distance > 2000:
        disp.text("Warning: Too Far!", 0, 0, 1)
    else:
        disp.text(f"Distance: {distance} mm", 0, 0, 1)
    disp.display()

    time.sleep(1)

Solution

Hey @Boss lady It looks like you’ve got most things set up correctly. The

issue

issue

with the display not updating is due to how the text is being rendered on the

OLED

OLED

screen, you could try making sure that each

frame

frame

is being drawn correctly before it’s

sent

sent

to the

display

display

. The

Adafruit_SSD1306

Adafruit_SSD1306

library has some

quirks

quirks

with the

text()

text()

method, and sometimes it doesn't update the display as expected. So try modifying your code to use the Image and ImageDraw modules to draw the text on a buffer before displaying it

Jump to solution

How to Display Warnings on OLED Based on Object Distance Using BeagleBone Black?

How to Display Warnings on OLED Based on Object Distance Using BeagleBone Black?

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