DeepSleep and SHT31-D alarm

[maamar]

hello everybody,

I read all the discusion about the deep sleep mode, I have temperature sensor SHT31-D https://www.adafruit.com/product/2857 and it has alarm pin, I want to make my Lopy in deepsleep and when the tempareture will be at 30° my lopy should wake up, until now without success first juste with deepsleep,

I'm using this code :

n = 1
while (n > 0):
  pycom.rgbled(0xff0000) # red
  time.sleep(0.4)
  line = CreateDataLine(n)
  logfiledata(line)



 ds.go_to_sleep(10)

 pycom.rgbled(0x7f7f00) # green
 time.sleep(0.4)

 n += 1

I update the last firmware, and the SHT31 pins use P10, P9 , GND, 3V3
I hope to have an help or orientation

kind regards
Maamar

[robert-hh]

@maamar said in DeepSleep and SHT31-D alarm:

P10, P9 , GND, 3V3

A few questions:

• can you communicate with the SHT31 via I2C and get some actual readings?
• did you program the device to use the alert pin?
• to which xxPy Pin is the alert Pin of the SHT31 connected?

The code snippet you show is not very complete and has inconsistent indentation.

[maamar]

[1_1501939070055_sht31.py](Uploading 100%) [0_1501939070054_main-rev3.py](Uploading 100%)

this my code and the driver SHT31-D

[robert-hh]

@maamar Somehow the code did not upload. I have sent you two reputation ticks, maybe that enables it.

[maamar]

@robert-hh said in DeepSleep and SHT31-D alarm:

@maamar said in DeepSleep and SHT31-D alarm:

P10, P9 , GND, 3V3

A few questions:

• can you communicate with the SHT31 via I2C and get some actual readings?

yes and I store the Data on SD card

• did you program the device to use the alert pin?

not yet, I am strugling with driver

• to which xxPy Pin is the alert Pin of the SHT31 connected?

The code snippet you show is not very complete and has inconsistent indentation.

I will post again the code

[maamar]

    from machine import I2C
    from machine import RTC
    from machine import SD
    from deepsleep import DeepSleep
    import machine
    import os
    import sht31
    import time
    import pycom
    import math

    # to add in the boot.py the two lines
    #sd = SD()
    #os.mount(sd, '/sd')

    FILE_NAME = '/sd/datalog2.txt'
    #CURRENT_DATE_TIME = (2017, 8, 5, 00, 00, 00, 0, 0)

    def logfiledata (line):
        f = open(FILE_NAME, 'a')
        f.write(line)
        f.close()

    def CreateDataLine(i):
        th = sensor.get_temp_humi()
        dataCSV = 'TH'+str(i) +"\t"    # point number
        #dataCSV += str(rtc.now()) + "\t"
        dataCSV += str(rtc.now()[0]) + "/"    #year
        dataCSV += str(rtc.now()[1]) + "/"    #month
        dataCSV += str(rtc.now()[2]) + " "    #day
        dataCSV += str(rtc.now()[3]) + ":"    # hour
        dataCSV += str(rtc.now()[4]) + ":"    #min
        dataCSV += str(rtc.now()[5]) + "\t "  #sec
        dataCSV += str(round(th[0],1))  + "\t "  #Temperature
        dataCSV += str(round(th[1],1)) +"\n"     #humidity
        return dataCSV


    pycom.heartbeat(False)
    #i2c = I2C(0)
    #i2c.init(I2C.MASTER,  baudrate=100000,  pins=("P9", "P19"))
    ds = DeepSleep()

    i2c = I2C(0, I2C.MASTER, baudrate=100000)
    sensor = sht31.SHT31(i2c, addr=0x44)

    th = sensor.get_temp_humi()
    time.sleep(0.6)

    pycom.rgbled(0xff007f) # magenta

    print("rev code 3")
    print("\n the Temperature SHT31 %0.2f C" % round(th[0],2))
    print("\n the Humidity SHT31 %0.2f h" % round(th[1],2))
    time.sleep(1)
    print("\n the Temperature SHT31 %0.3f C" % th[0])
    print("\n the Humidity SHT31 %0.2f h" % th[1])
    #print 'Temp             = {0:0.3f} deg C'.format(th[0])
    #print 'Humidity         = {0:0.2f} h'.format(th[1])

    time.sleep(1)

    rtc = machine.RTC()
    #lopy 7eca
    rtc.init((2017, 8, 5, 00, 00, 00, 0, 0))
    print(rtc.now())

    n = 1
    while (n > 0):

        pycom.rgbled(0xff0000) # red
        time.sleep(0.4)

        line = CreateDataLine(n)
        logfiledata(line)



        ds.go_to_sleep(10)

        pycom.rgbled(0x7f7f00) # green
        time.sleep(0.4)

        n += 1
        time.sleep(5.2)

    print("fin de programme ! maamar")
    pycom.heartbeat(True)

[maamar]

@maamar
sh31 lib
from machine import I2C
import time

R_HIGH = const(1)
R_MEDIUM = const(2)
R_LOW = const(3)

class SHT31(object):
"""
This class implements an interface to the SHT31 temprature and humidity
sensor from Sensirion.
"""

# This static map helps keeping the heap and program logic cleaner
_map_cs_r = {
  True: {
        R_HIGH : b'\x2c\x06',
        R_MEDIUM : b'\x2c\x0d',
        R_LOW: b'\x2c\x10'
        },
    False: {
        R_HIGH : b'\x24\x00',
        R_MEDIUM : b'\x24\x0b',
        R_LOW: b'\x24\x16'
        }
    }

def __init__(self, i2c, addr=0x44):
    """
    Initialize a sensor object on the given I2C bus and accessed by the
    given address.
    """
    if i2c == None or i2c.__class__ != I2C:
        raise ValueError('I2C object needed as argument!')
    self._i2c = i2c
    self._addr = addr

def _send(self, buf):
    """
    Sends the given buffer object over I2C to the sensor.
    """
    self._i2c.writeto(self._addr, buf)

def _recv(self, count):
    """
    Read bytes from the sensor using I2C. The byte count can be specified
    as an argument.
    Returns a bytearray for the result.
    """
    return self._i2c.readfrom(self._addr, count)

def _raw_temp_humi(self, r=R_HIGH, cs=True):
    """
    Read the raw temperature and humidity from the sensor and skips CRC
    checking.
    Returns a tuple for both values in that order.
    """
    if r not in (R_HIGH, R_MEDIUM, R_LOW):
        raise ValueError('Wrong repeatabillity value given!')
    self._send(self._map_cs_r[cs][r])
    time.sleep_ms(50)
    raw = self._recv(6)
    return (raw[0] << 8) + raw[1], (raw[3] << 8) + raw[4]

def get_temp_humi(self, resolution=R_HIGH, clock_stretch=True, celsius=True):
    """
    Read the temperature in degree celsius or fahrenheit and relative
    humidity. Resolution and clock stretching can be specified.
    Returns a tuple for both values in that order.
    """
    t, h = self._raw_temp_humi(resolution, clock_stretch)
    if celsius:
        temp = -45 + (175 * (t / 65535))
    else:
        temp = -49 + (315 * (t / 65535))
    return temp, 100 * (h / 65535)