Enviro+ and luftdaten.py – with no PMS5003

Good afternoon. I hope you’re all well.

Having just purchased and set up an Enviro+ for my Pi Zero WH, I signed up for Sensor.Community and attempted to run the Luftdaten script. It does seem to get started, but shortly after I see the following recurring error:

PMS5003 Read Timeout: Failed to read start of frame byte

And nothing else.

I don’t have a PMS5003, so it makes sense. But this seems to be blocking the data from being sent to Sensor.Community, and to the LCD screen on the Enviro+. When running the Luftdaten script, the screen shows nothing but white noise.

Is there a way to tell luftdaten.py to skip the missing PMS5003? Like all-in-one-no-pm.py does?

I’ve listed the BME280 as the only available sensor on Sensor.Community’s dashboard, but this doesn’t seem to have an impact on the script.

I’ve also tried to remove a few PMS5003-related functions from the script, which worked for a while. Even the LCD worked, showing the status of the WiFi connection and the sensor ID as it should. But after a few seconds the log started showing data errors related to the missing PMS5003.

Needless to say, I’m not familiar with Python.

Please let me know if you need further details.

Thank you in advance!

You need to edit the luftdaten.py file and remark out the PMS5003 lines.
Like so

# Create PMS5003 instance
#pms5003 = PMS5003()

and remark out or delete

        pm_values = pms5003.read()
        values["P2"] = str(pm_values.pm_ug_per_m3(2.5))
        values["P1"] = str(pm_values.pm_ug_per_m3(10))
    except ReadTimeoutError:
        pm_values = pms5003.read()
        values["P2"] = str(pm_values.pm_ug_per_m3(2.5))
        values["P1"] = str(pm_values.pm_ug_per_m3(10))
    return values

And any other PMS code.


Thank you for your reply.

I reckon that’s exactly what I did, and yet the terminal showed errors linked to the lack of certain values. What’s more, Sensor.Community didn’t seem to receive any of my data – even after eight or nine hours. The default WiFi and ID details are shown on the LCD just fine, though.

The code I used is below.

Thanks again!

#!/usr/bin/env python3

import requests
import ST7735
import time
from bme280 import BME280
# from pms5003 import PMS5003, ReadTimeoutError
from subprocess import PIPE, Popen, check_output
from PIL import Image, ImageDraw, ImageFont
from fonts.ttf import RobotoMedium as UserFont

    from smbus2 import SMBus
except ImportError:
    from smbus import SMBus

print("""luftdaten.py - Reads temperature, pressure, humidity,
PM2.5, and PM10 from Enviro plus and sends data to Luftdaten,
the citizen science air quality project.

Note: you'll need to register with Luftdaten at:
https://meine.luftdaten.info/ and enter your Raspberry Pi
serial number that's displayed on the Enviro plus LCD along
with the other details before the data appears on the
Luftdaten map.

Press Ctrl+C to exit!


bus = SMBus(1)

# Create BME280 instance
bme280 = BME280(i2c_dev=bus)

# Create LCD instance
disp = ST7735.ST7735(

# Initialize display

# Create PMS5003 instance
# pms5003 = PMS5003()

# Read values from BME280 and PMS5003 and return as dict
def read_values():
    values = {}
    cpu_temp = get_cpu_temperature()
    raw_temp = bme280.get_temperature()
    comp_temp = raw_temp - ((cpu_temp - raw_temp) / comp_factor)
    values["temperature"] = "{:.2f}".format(comp_temp)
    values["pressure"] = "{:.2f}".format(bme280.get_pressure() * 100)
    values["humidity"] = "{:.2f}".format(bme280.get_humidity())
    return values

# Get CPU temperature to use for compensation
def get_cpu_temperature():
    process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE, universal_newlines=True)
    output, _error = process.communicate()
    return float(output[output.index('=') + 1:output.rindex("'")])

# Get Raspberry Pi serial number to use as ID
def get_serial_number():
    with open('/proc/cpuinfo', 'r') as f:
        for line in f:
            if line[0:6] == 'Serial':
                return line.split(":")[1].strip()

# Check for Wi-Fi connection
def check_wifi():
    if check_output(['hostname', '-I']):
        return True
        return False

# Display Raspberry Pi serial and Wi-Fi status on LCD
def display_status():
    wifi_status = "connected" if check_wifi() else "disconnected"
    text_colour = (255, 255, 255)
    back_colour = (0, 170, 170) if check_wifi() else (85, 15, 15)
    id = get_serial_number()
    message = "{}\nWi-Fi: {}".format(id, wifi_status)
    img = Image.new('RGB', (WIDTH, HEIGHT), color=(0, 0, 0))
    draw = ImageDraw.Draw(img)
    size_x, size_y = draw.textsize(message, font)
    x = (WIDTH - size_x) / 2
    y = (HEIGHT / 2) - (size_y / 2)
    draw.rectangle((0, 0, 160, 80), back_colour)
    draw.text((x, y), message, font=font, fill=text_colour)

# def send_to_luftdaten(values, id):
#     pm_values = dict(i for i in values.items() if i[0].startswith("P"))
#     temp_values = dict(i for i in values.items() if not i[0].startswith("P"))
#     pm_values_json = [{"value_type": key, "value": val} for key, val in pm_values.items()]
#     temp_values_json = [{"value_type": key, "value": val} for key, val in temp_values.items()]
#     resp_1 = requests.post(
#         "https://api.luftdaten.info/v1/push-sensor-data/",
#         json={
#             "software_version": "enviro-plus 0.0.1",
#             "sensordatavalues": pm_values_json
#         },
#         headers={
#             "X-PIN": "1",
#             "X-Sensor": id,
#             "Content-Type": "application/json",
#             "cache-control": "no-cache"
#         }
#     )

    resp_2 = requests.post(
            "software_version": "enviro-plus 0.0.1",
            "sensordatavalues": temp_values_json
            "X-PIN": "11",
            "X-Sensor": id,
            "Content-Type": "application/json",
            "cache-control": "no-cache"

    if resp_1.ok and resp_2.ok:
        return True
        return False

# Compensation factor for temperature
comp_factor = 2.25

# Raspberry Pi ID to send to Luftdaten
id = "raspi-" + get_serial_number()

# Width and height to calculate text position
WIDTH = disp.width
HEIGHT = disp.height

# Text settings
font_size = 16
font = ImageFont.truetype(UserFont, font_size)

# Display Raspberry Pi serial and Wi-Fi status
print("Raspberry Pi serial: {}".format(get_serial_number()))
print("Wi-Fi: {}\n".format("connected" if check_wifi() else "disconnected"))

time_since_update = 0
update_time = time.time()

# Main loop to read data, display, and send to Luftdaten
while True:
        time_since_update = time.time() - update_time
        values = read_values()
        if time_since_update > 145:
            resp = send_to_luftdaten(values, id)
            update_time = time.time()
            print("Response: {}\n".format("ok" if resp else "failed"))
    except Exception as e:

It may be this bit of code as you have remarked out resp_1?

    if resp_1.ok and resp_2.ok:
        return True
        return False

Fair point, thank you for that.

I’ve commented that bit out too, but didn’t run it in the Pi’s terminal because the connection over SSH is excruciatingly slow. The crontab was updated with the new code, and the Pi has been rebooted.

Will keep an eye on Sensor.Community to see what happens.