MicroPython Forum (Archive)

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from machine import Pin, RTC
import machine
from dht import DHT11, InvalidChecksum
import sdcard
import uos
import utime


# DHT 11 setup
# Defining the Pin of the DHT11 Sensor
dhtPIN = 28
sensor = DHT11(Pin(dhtPIN, Pin.IN, Pin.PULL_UP))

# Real Time Clock (RTC) Setup
# The logged Data get a Time Reference
rtc = RTC()
rtc.datetime((2017, 8, 23, 2, 12, 48, 0, 0)) # set a specific date and
                                             # time, eg. 2021/10/18 11:21:48

# SD Card setup
# On the SD Card, the collected Data will be stored.
# Assign chip select (CS) pin (and start it high)
cs = machine.Pin(9, machine.Pin.OUT)


# Intialize SPI peripheral (start with 1 MHz)
spi = machine.SPI(1,
                  baudrate=1000000,
                  polarity=0,
                  phase=0,
                  bits=8,
                  firstbit=machine.SPI.MSB,
                  sck=machine.Pin(14),
                  mosi=machine.Pin(15),
                  miso=machine.Pin(12))

# Initialize SD card
sd = sdcard.SDCard(spi, cs)

# Mount filesystem
vfs = uos.VfsFat(sd)
uos.mount(vfs, "/sd")

# Check if Filename already exists on SDCard
fname = "/sd/Datalog.txt"
i = 0

while True:
    try:
        f = open(fname, "r")
        exists = True
        f.close()
        print ("File " +str(fname)+ " exists")
        i +=1
        fname = "/sd/DataLog_"+str(i)+".txt"
        utime.sleep(0.01)
    except:
        exists = False
        print("File Datalog_" + str(i) +".txt does not exists")
        break




    
# Create the file with the non-existing Filename and write the Headline 
with open(fname, "w") as file:
    file.write("Date" + "\t"+ "Temperature" + "\t" + "Humidity" + "\r\n")


    while True:
       
        # Temperature will be saved on the Variable temp        
        temp  = (sensor.temperature)
        
        # Humidity will be saved on the Variable hum 
        hum = (sensor.humidity)
        
        print(rtc.datetime())
        
        file.write(str(rtc.datetime()) + "\t"+ str(temp) +"" + "\t" + str(hum) +"%" +"\r\n") # \t produces a tab between the Values. With the Function read.delim() in RStudio: for reading “tab-separated value” files (“.txt”). By default, point (“.”) is used as decimal points.
        
        # The Intervall for DHT11 has to be greater than 4 Seconds
        utime.sleep(4)

Code: Select all

f=open("file.txt", "a")

Code: Select all

while True:
    try:
        f = open(fname, "r")
        exists = True
        f.close()
        print ("File " +str(fname)+ " exists")
        i +=1
        fname = "/sd/DataLog_"+str(i)+".txt"
    
    except:
        exists = False
        print("File Datalog_" + str(i) +".txt does not exists")
        # Create the file with the non-existing Filename and write the Headline 
        with open(fname, "w") as file:
            file.write("Date" + "\t"+ "Temperature" + "\t" + "Humidity" + "\r\n")
            file.close()
            break


while True:
    # The Intervall for DHT11 has to be greater than 4 Seconds
    utime.sleep(5)
    
    sensor.measure()
    # Temperature will be saved on the Variable temp        
    temp  = (sensor.temperature)
        
    # Humidity will be saved on the Variable hum 
    hum = (sensor.humidity)
        
    print(rtc.datetime())
    
    file = open(fname, "a")
    file.write(str(rtc.datetime()) + "\t"+ str(temp) +"" + "\t" + str(hum) +"%" +"\r\n") # \t produces a tab between the Values. With the Function read.delim() in RStudio: for reading “tab-separated value” files (“.txt”). By default, point (“.”) is used as decimal points.
    file.close()   

Code: Select all

from machine import Pin
from dht import DHT11, InvalidChecksum
import utime


# Defining the Pin of the DHT11 Sensor
pin = Pin(26, Pin.OUT, Pin.PULL_DOWN)
sensor = DHT11(pin)


while True:
#     The Sensor refreshes every 2 Seconds, therefore a faster cycle would not bring a better outcome.
    utime.sleep(2)
    
    sensor.measure()

    # Save Temperature-Data on variable t
    t  = (sensor.temperature)
    # Save Humidity-Data on variable h
    h = (sensor.humidity)
    
    # Show Temperature and Humidity in the Shell:
    print("Temperature: {}".format(sensor.temperature))
    print("Humidity: {}".format(sensor.humidity))