Simple test
Ensure your device works with this simple test.
examples/pm25_simpletest.py
1# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
2# SPDX-License-Identifier: MIT
3
4"""
5Example sketch to connect to PM2.5 sensor with either I2C or UART.
6"""
7
8import time
9
10import board
11import busio
12from digitalio import DigitalInOut, Direction, Pull
13
14from adafruit_pm25.i2c import PM25_I2C
15
16reset_pin = None
17# If you have a GPIO, its not a bad idea to connect it to the RESET pin
18# reset_pin = DigitalInOut(board.G0)
19# reset_pin.direction = Direction.OUTPUT
20# reset_pin.value = False
21
22
23# For use with a computer running Windows:
24# import serial
25# uart = serial.Serial("COM30", baudrate=9600, timeout=1)
26
27# For use with microcontroller board:
28# (Connect the sensor TX pin to the board/computer RX pin)
29# uart = busio.UART(board.TX, board.RX, baudrate=9600)
30
31# For use with Raspberry Pi/Linux:
32# import serial
33# uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=0.25)
34
35# For use with USB-to-serial cable:
36# import serial
37# uart = serial.Serial("/dev/ttyUSB0", baudrate=9600, timeout=0.25)
38
39# Connect to a PM2.5 sensor over UART
40# from adafruit_pm25.uart import PM25_UART
41# pm25 = PM25_UART(uart, reset_pin)
42
43# Create library object, use 'slow' 100KHz frequency!
44i2c = busio.I2C(board.SCL, board.SDA, frequency=100000)
45# Connect to a PM2.5 sensor over I2C
46pm25 = PM25_I2C(i2c, reset_pin)
47
48print("Found PM2.5 sensor, reading data...")
49
50while True:
51 time.sleep(1)
52
53 try:
54 aqdata = pm25.read()
55 # print(aqdata)
56 except RuntimeError:
57 print("Unable to read from sensor, retrying...")
58 continue
59
60 print()
61 print("Concentration Units (standard)")
62 print("---------------------------------------")
63 print(
64 f"PM 1.0: {aqdata['pm10 standard']}\t"
65 + f"PM2.5: {aqdata['pm25 standard']}\t"
66 + f"PM10: {aqdata['pm100 standard']}"
67 )
68 print("Concentration Units (environmental)")
69 print("---------------------------------------")
70 print(
71 f"PM 1.0: {aqdata['pm10 env']}\t"
72 + f"PM2.5: {aqdata['pm25 env']}\t"
73 + f"PM10: {aqdata['pm100 env']}"
74 )
75 print("---------------------------------------")
76 print("Particles > 0.3um / 0.1L air:", aqdata["particles 03um"])
77 print("Particles > 0.5um / 0.1L air:", aqdata["particles 05um"])
78 print("Particles > 1.0um / 0.1L air:", aqdata["particles 10um"])
79 print("Particles > 2.5um / 0.1L air:", aqdata["particles 25um"])
80 print("Particles > 5.0um / 0.1L air:", aqdata["particles 50um"])
81 print("Particles > 10 um / 0.1L air:", aqdata["particles 100um"])
82 print("---------------------------------------")