Raspberry Pi Stats Display

Last updated March 08, 2024

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Running Code as a Service

Getting Started

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The 3D printed insert can be found here: https://www.printables.com/model/710601-pi-5-official-case-active-cooler-insert-small-came

To get the display to show stats, first install blinka by following the guide here: https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

Assuming you created a python virtual environment in /home/pi/env path, run the following commands:

cd ~

source ./env/bin/activate

pip install adafruit-circuitpython-ssd1306

Now create your python file called stats_display.py in the /home/pi directory.

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#! /home/pi/env/blinka/bin/python3

import adafruit_ssd1306
import board
import busio
import digitalio
import json
import math
import requests
import signal
import subprocess
import sys
import time
from PIL import Image, ImageDraw, ImageFont

i2c = busio.I2C(board.SCL, board.SDA)
disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c, addr=0x3D)
disp.fill(0)
disp.show()
width = disp.width
height = disp.height
image = Image.new("1", (width, height))
draw = ImageDraw.Draw(image)
draw.rectangle((0, 0, width, height), outline=0, fill=0)
padding = 0 
top = padding
bottom = height - padding
x = 2
font = ImageFont.load_default()

def handler(signum = None, frame = None):
    print('-------------------')
    print('turning off display')
    print('-------------------')
    clearDisplay()
    sys.exit(0)

def clearDisplay():
    draw.rectangle((0, 0, width, height), outline=0, fill=0)
    disp.image(image)
    disp.show()

for sig in [signal.SIGTERM, signal.SIGQUIT]:
    signal.signal(sig, handler)

def run():
    global outsideTemp, currentTime, previousTime
    #print(pos)
    draw.rectangle((0, 0, width, height), outline=0, fill=0)
    cmd = "hostname -I | cut -d' ' -f1"
    IP = subprocess.check_output(cmd, shell=True).decode("utf-8")
    cmd = 'vcgencmd measure_temp'
    Temp = subprocess.check_output(cmd, shell=True).decode("utf-8")
    tempStr = Temp.replace('temp=', '')
    cmd = 'vcgencmd measure_clock arm'
    Freq = subprocess.check_output(cmd, shell=True).decode("utf-8")
    Freq = Freq.replace('frequency(0)=', '')
    freqNum = int(Freq) / 1000000000
    freqNum2 = format(freqNum, '.1f') + " GHz"

    ipList = IP.split('.')
    ip1 = '.'.join(map(str, ipList[:2]))
    if (ip1 != ''):
        ip1 = ip1 + '.'
    ip2 = '.'.join(map(str, ipList[2:]))

    draw.text((35, 0), ip1, font=font, fill=255)
    draw.text((35, 10), ip2, font=font, fill=255)
    draw.text((35, 25), tempStr, font=font, fill=255)
    draw.text((35, 40), freqNum2, font=font, fill=255)

    disp.image(image.rotate(90))
    disp.show()
    time.sleep(0.1)

while True:
    try:
        run()
    except KeyboardInterrupt:
        clearDisplay()
        print()
        sys.exit(0)
    except Exception:
        clearDisplay()
        print()
        sys.exit(0)

#! /home/pi/env/blinka/bin/python3

import adafruit_ssd1306
import board
import busio
import digitalio
import json
import math
import requests
import signal
import subprocess
import sys
import time
from PIL import Image, ImageDraw, ImageFont

i2c = busio.I2C(board.SCL, board.SDA)
disp = adafruit_ssd1306.SSD1306_I2C(128, 64, i2c, addr=0x3D)
disp.fill(0)
disp.show()
width = disp.width
height = disp.height
image = Image.new("1", (width, height))
draw = ImageDraw.Draw(image)
draw.rectangle((0, 0, width, height), outline=0, fill=0)
padding = 0 
top = padding
bottom = height - padding
x = 2
font = ImageFont.load_default()

def handler(signum = None, frame = None):
    print('-------------------')
    print('turning off display')
    print('-------------------')
    clearDisplay()
    sys.exit(0)

def clearDisplay():
    draw.rectangle((0, 0, width, height), outline=0, fill=0)
    disp.image(image)
    disp.show()

for sig in [signal.SIGTERM, signal.SIGQUIT]:
    signal.signal(sig, handler)

def run():
    global outsideTemp, currentTime, previousTime
    #print(pos)
    draw.rectangle((0, 0, width, height), outline=0, fill=0)
    cmd = "hostname -I | cut -d' ' -f1"
    IP = subprocess.check_output(cmd, shell=True).decode("utf-8")
    cmd = 'vcgencmd measure_temp'
    Temp = subprocess.check_output(cmd, shell=True).decode("utf-8")
    tempStr = Temp.replace('temp=', '')
    cmd = 'vcgencmd measure_clock arm'
    Freq = subprocess.check_output(cmd, shell=True).decode("utf-8")
    Freq = Freq.replace('frequency(0)=', '')
    freqNum = int(Freq) / 1000000000
    freqNum2 = format(freqNum, '.1f') + " GHz"

    ipList = IP.split('.')
    ip1 = '.'.join(map(str, ipList[:2]))
    if (ip1 != ''):
        ip1 = ip1 + '.'
    ip2 = '.'.join(map(str, ipList[2:]))

    draw.text((35, 0), ip1, font=font, fill=255)
    draw.text((35, 10), ip2, font=font, fill=255)
    draw.text((35, 25), tempStr, font=font, fill=255)
    draw.text((35, 40), freqNum2, font=font, fill=255)

    disp.image(image.rotate(90))
    disp.show()
    time.sleep(0.1)

while True:
    try:
        run()
    except KeyboardInterrupt:
        clearDisplay()
        print()
        sys.exit(0)
    except Exception:
        clearDisplay()
        print()
        sys.exit(0)

Please try running the command:

vcgencmd measure_clock arm

If your output does not start with frequency(0)= then you will need to change the line:

Freq = Freq.replace('frequency(0)=', '')

to match the start of your output in the code file above.

Now try to run the code by calling:

python ./stats_display.py

If the display is working, we can now run this as a service at start up.

Running Code as a Service

Create a file called zzzDisplay.service

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[Unit]
Description=OLED Display
After=multi-user.target

[Service]
Type=idle
ExecStart=/home/pi/env/bin/python3 /home/pi/stats_display.py
Restart=no
KillMode=process

[Install]
WantedBy=multi-user.target

[Unit]
Description=OLED Display
After=multi-user.target

[Service]
Type=idle
ExecStart=/home/pi/env/bin/python3 /home/pi/stats_display.py
Restart=no
KillMode=process

[Install]
WantedBy=multi-user.target

Next run:

sudo cp ./zzzDisplay.service /lib/systemd/system/

sudo systemctl daemon-reload

sudo systemctl enable zzzDisplay.service

sudo systemctl start zzzDisplay.service

Now you can reboot your pi and the display should start working.

If you would like to stop the display, you can run:

sudo systemctl stop zzzDisplay.service

This page (Raspberry Pi Stats Display) was last updated on March 08, 2024.