Enviro+ can't get the display to work

Support
1

Hi,
I’ve just got an Enviro+ with the particulate matter sensor and unfortunately I can’t get the LCD display to work. Running the lcd.py example I get a tiny multi-coloured ring which you can just make out in the photo

evirolcd
evirolcd2197×1697 853 KB

My Set-up:
new Pi Zero WH with latest raspbian os
Official raspberryPi power supply so power should be OK.
Enviro + Air Quality
PMS5003 Particulate Matter Sensor
Followed GitHub - pimoroni/enviroplus-python: Python library for the Enviro+ environmental monitoring board and Getting Started with Enviro+ - Pimoroni Yarr-niversity to install, configure and test the board.

The sensors appear to be working correctly in that I can obtain readings from the PMS and from the board (gas, temp, proximity, light). I have run the python examples.
The LCD backlight is coming on and off when the program finishes. The display displays a tiny multi-coloured ring when running lcd.py.

SPI is definitely enabled.
I have checked all the python libraries including the ST7735 library.

I’ve tried the enviro+ on a Pi4 and the results are the same. I ran the lcd.py in debug and added all the requested libraries until it ran without error.

Help!

Thanks

2

I don’t have an Enviro+ but I am running the all-in-one-mini example of that screens Breakout Garden breakout and a BME280 breakout.
curl https://get.pimoroni.com/st7735 | bash should install everything needed for it to run.
I usually run the scrolling text example as a test from here,
st7735-python/examples at master · pimoroni/st7735-python · GitHub
The others should work too, you’ll have to edit the screen setup bit for them to work though. This “should” work on the enviro+ screen.

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import time

import ST7735


MESSAGE = "Hello World! How are you today?"

# Create ST7735 LCD display class.
disp = ST7735.ST7735(
    port=0,
    cs=1, 
    dc=9,
    backlight=12,
    rotation=90,
    spi_speed_hz=10000000
)

# Initialize display.
disp.begin()

WIDTH = disp.width
HEIGHT = disp.height


img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0))

draw = ImageDraw.Draw(img)

font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf", 30)

size_x, size_y = draw.textsize(MESSAGE, font)

text_x = 160
text_y = (80 - size_y) // 2

t_start = time.time()

while True:
    x = (time.time() - t_start) * 100
    x %= (size_x + 160)
    draw.rectangle((0, 0, 160, 80), (0, 0, 0))
    draw.text((int(text_x - x), text_y), MESSAGE, font=font, fill=(255, 255, 255))
    disp.display(img)
3

You may also want to install this font. I had to for one of the examples to work.
sudo pip3 install fonts
sudo pip3 install font-roboto

4

I don’t know if it’s just me but when I look good at the image and zoom in it looks like the LCD display has a crack, which might be the cause of the problem? Also because the right side of the crack in the display has a somewhat multicoloured line?

5

Hi aplhanumeric,
Thanks for your help.
I’ve run your code in debug and when I execute the line disp.begin() the display shows the multi-coloured ring

envirolcd2
envirolcd21209×1173 225 KB

Picking up on placebo83’s comment on a crack it does look like there’s a crack but it’s not visible when the screen is off.
Running the rest of the code doesn’t change what is displayed.

6

Hi Alphanumeric,
Yes I had the same issue and had installed the fonts. Trying the install again gave;

pi@raspberrypi4:~ sudo pip3 install fonts Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple Requirement already satisfied: fonts in /usr/local/lib/python3.7/dist-packages (0.0.3) pi@raspberrypi4:~ sudo pip3 install font-roboto
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: font-roboto in /usr/local/lib/python3.7/dist-packages (0.0.1)

Everything seems to be there

7

Hi placebo83,
Thanks for your help.
I can’t see a crack when the dislay is off, but you’re right it does look like it’s cracked when lit here’s the latest phot when running alphanumeric’s python

envirolcd2
envirolcd21209×1173 225 KB

8

Yeah, it looks like the screen is cracked / broken.