### wk.lcd DHT-001
from machine import Pin,I2C
from i2c_lcd import I2cLcd

I2C = I2C(scl=Pin(22), sda=Pin(21), freq=10000)     
lcd = I2cLcd(I2C, 0x27, 2, 16)
lcd.backlight_on()
lcd.clear()

import dht
import time
sensor1820 = dht.DHT22(Pin(4))
import onewire, ds18x20


### DS18B20 setup ====================

ds_pin =Pin(15)  ### GPIO15
sensor1820 = ds18x20.DS18X20(onewire.OneWire(ds_pin))
roms = sensor.scan()
print('Found DS devices: ', roms)

# import BlynkLib
# import network
# from time import sleep

# WIFI_SSID = 'NU-MTeSS'
# WIFI_PASS = '04072021'
# BLYNK_AUTH = 'aBFCfCj51zZA2oWCHm8UTIz3D3TmNm2l'

# wifi = network.WLAN(network.STA_IF)
# if not wifi.isconnected():
#     print("Connecting to WiFi...")
#     wifi.active(True)
#     wifi.connect(WIFI_SSID, WIFI_PASS)
#     while not wifi.isconnected():
#         pass
# print('IP:', wifi.ifconfig()[0])
# blynk = BlynkLib.Blynk(BLYNK_AUTH)


while True:
    time.sleep(2)
    sensor.measure()
    temp = sensor.temperature()
    humi = sensor.humidity()

    sensor.convert_temp()
    time.sleep_ms(750)
    for rom in roms:
    temp1820 = 'Temp: {:.2f} \u00B0C'.format (sensor1820.read_temp(roms))
    print(temp1820)

    txtTemp = 'Temp: {:6.2f} {}C '.format(temp,chr(223))
    lcd.move_to(0,0)
    lcd.putstr(txtTemp)

    txtHumi = 'Humi: {:5.1f}  %  '.format(humi)
    lcd.move_to(0,1)
    lcd.putstr(txtHumi)

    txt = 'Temp: {:6.2f} C,  Humi: {:5.1f} %'.format(temp,humi)
    print(txt)
#     blynk.virtual_write(0,temp)
#     blynk.virtual_write(1,humi)

    # workshop-ds1820-001.py

### ds1820 lib =======================

import machine, onewire, ds18x20, time


### DS18B20 setup ====================

ds_pin = machine.Pin(15)  ### GPIO15
sensor = ds18x20.DS18X20(onewire.OneWire(ds_pin))
roms = sensor.scan()
print('Found DS devices: ', roms)
### ===================================
while True:
  sensor.convert_temp()
  time.sleep_ms(750)
  for rom in roms:
      temp = 'Temp: {:.2f} \u00B0C'.format (sensor.read_temp(rom))
      print(temp)  


main.py

diagram.json

"""Implements a HD44780 character LCD connected via PCF8574 on I2C. 
   This was tested with: https://www.wemos.cc/product/d1-mini.html""" 
from lcd_api import LcdApi 
from machine import I2C 
from time import sleep_ms 
# The PCF8574 has a jumper selectable address: 0x20 - 0x27 
#DEFAULT_I2C_ADDR = 0x20 
# Defines shifts or masks for the various LCD line attached to the PCF8574 
MASK_RS = 0x01 
MASK_RW = 0x02 
MASK_E = 0x04 
SHIFT_BACKLIGHT = 3 
SHIFT_DATA = 4 
class I2cLcd(LcdApi): 
    """Implements a HD44780 character LCD connected via PCF8574 on I2C.""" 
    def __init__(self, i2c, i2c_addr, num_lines, num_columns): 
        self.i2c = i2c 
        self.i2c_addr = i2c_addr 
        self.i2c.writeto(self.i2c_addr, bytearray([0])) 
        sleep_ms(20)   # Allow LCD time to powerup 
        # Send reset 3 times 
        self.hal_write_init_nibble(self.LCD_FUNCTION_RESET) 
        sleep_ms(5)    # need to delay at least 4.1 msec 
        self.hal_write_init_nibble(self.LCD_FUNCTION_RESET) 
        sleep_ms(1) 
        self.hal_write_init_nibble(self.LCD_FUNCTION_RESET) 
        sleep_ms(1) 
        # Put LCD into 4 bit mode 
        self.hal_write_init_nibble(self.LCD_FUNCTION) 
        sleep_ms(1) 
        LcdApi.__init__(self, num_lines, num_columns) 
        cmd = self.LCD_FUNCTION 
        if num_lines > 1: 
            cmd |= self.LCD_FUNCTION_2LINES 
        self.hal_write_command(cmd) 
    def hal_write_init_nibble(self, nibble): 
        """Writes an initialization nibble to the LCD. 
        This particular function is only used during initialization. 
        """ 
        byte = ((nibble >> 4) & 0x0f) << SHIFT_DATA 
        self.i2c.writeto(self.i2c_addr, bytearray([byte | MASK_E])) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte])) 
    def hal_backlight_on(self): 
        """Allows the hal layer to turn the backlight on.""" 
        self.i2c.writeto(self.i2c_addr, bytearray([1 << SHIFT_BACKLIGHT])) 
    def hal_backlight_off(self): 
        """Allows the hal layer to turn the backlight off.""" 
        self.i2c.writeto(self.i2c_addr, bytearray([0])) 
    def hal_write_command(self, cmd): 
        """Writes a command to the LCD. 
        Data is latched on the falling edge of E. 
        """ 
        byte = ((self.backlight << SHIFT_BACKLIGHT) | (((cmd >> 4) & 0x0f) << SHIFT_DATA)) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte | MASK_E])) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte])) 
        byte = ((self.backlight << SHIFT_BACKLIGHT) | ((cmd & 0x0f) << SHIFT_DATA)) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte | MASK_E])) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte])) 
        if cmd <= 3: 
            # The home and clear commands require a worst case delay of 4.1 msec 
            sleep_ms(5) 
    def hal_write_data(self, data): 
        """Write data to the LCD.""" 
        byte = (MASK_RS | (self.backlight << SHIFT_BACKLIGHT) | (((data >> 4) & 0x0f) << SHIFT_DATA)) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte | MASK_E])) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte])) 
        byte = (MASK_RS | (self.backlight << SHIFT_BACKLIGHT) | ((data & 0x0f) << SHIFT_DATA)) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte | MASK_E])) 
        self.i2c.writeto(self.i2c_addr, bytearray([byte]))


i2c_lcd.py

"""Provides an API for talking to HD44780 compatible character LCDs.""" 
import time 
class LcdApi: 
    """Implements the API for talking with HD44780 compatible character LCDs. 
    This class only knows what commands to send to the LCD, and not how to get 
    them to the LCD. 
    It is expected that a derived class will implement the hal_xxx functions. 
    """ 
    # The following constant names were lifted from the avrlib lcd.h 
    # header file, however, I changed the definitions from bit numbers 
    # to bit masks. 
    # 
    # HD44780 LCD controller command set 
    LCD_CLR = 0x01              # DB0: clear display 
    LCD_HOME = 0x02             # DB1: return to home position 
    LCD_ENTRY_MODE = 0x04       # DB2: set entry mode 
    LCD_ENTRY_INC = 0x02        # --DB1: increment 
    LCD_ENTRY_SHIFT = 0x01      # --DB0: shift 
    LCD_ON_CTRL = 0x08          # DB3: turn lcd/cursor on 
    LCD_ON_DISPLAY = 0x04       # --DB2: turn display on 
    LCD_ON_CURSOR = 0x02        # --DB1: turn cursor on 
    LCD_ON_BLINK = 0x01         # --DB0: blinking cursor 
    LCD_MOVE = 0x10             # DB4: move cursor/display 
    LCD_MOVE_DISP = 0x08        # --DB3: move display (0-> move cursor) 
    LCD_MOVE_RIGHT = 0x04       # --DB2: move right (0-> left) 
    LCD_FUNCTION = 0x20         # DB5: function set 
    LCD_FUNCTION_8BIT = 0x10    # --DB4: set 8BIT mode (0->4BIT mode) 
    LCD_FUNCTION_2LINES = 0x08  # --DB3: two lines (0->one line) 
    LCD_FUNCTION_10DOTS = 0x04  # --DB2: 5x10 font (0->5x7 font) 
    LCD_FUNCTION_RESET = 0x30   # See "Initializing by Instruction" section 
    LCD_CGRAM = 0x40            # DB6: set CG RAM address 
    LCD_DDRAM = 0x80            # DB7: set DD RAM address 
    LCD_RS_CMD = 0 
    LCD_RS_DATA = 1 
    LCD_RW_WRITE = 0 
    LCD_RW_READ = 1 
    def __init__(self, num_lines, num_columns): 
        self.num_lines = num_lines 
        if self.num_lines > 4: 
            self.num_lines = 4 
        self.num_columns = num_columns 
        if self.num_columns > 40: 
            self.num_columns = 40 
        self.cursor_x = 0 
        self.cursor_y = 0 
        self.implied_newline = False 
        self.backlight = True 
        self.display_off() 
        self.backlight_on() 
        self.clear() 
        self.hal_write_command(self.LCD_ENTRY_MODE | self.LCD_ENTRY_INC) 
        self.hide_cursor() 
        self.display_on() 
    def clear(self): 
        """Clears the LCD display and moves the cursor to the top left 
        corner. 
        """ 
        self.hal_write_command(self.LCD_CLR) 
        self.hal_write_command(self.LCD_HOME) 
        self.cursor_x = 0 
        self.cursor_y = 0 
    def show_cursor(self): 
        """Causes the cursor to be made visible.""" 
        self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY | 
                               self.LCD_ON_CURSOR) 
    def hide_cursor(self): 
        """Causes the cursor to be hidden.""" 
        self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY) 
    def blink_cursor_on(self): 
        """Turns on the cursor, and makes it blink.""" 
        self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY | 
                               self.LCD_ON_CURSOR | self.LCD_ON_BLINK) 
    def blink_cursor_off(self): 
        """Turns on the cursor, and makes it no blink (i.e. be solid).""" 
        self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY | 
                               self.LCD_ON_CURSOR) 
    def display_on(self): 
        """Turns on (i.e. unblanks) the LCD.""" 
        self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY) 
    def display_off(self): 
        """Turns off (i.e. blanks) the LCD.""" 
        self.hal_write_command(self.LCD_ON_CTRL) 
    def backlight_on(self): 
        """Turns the backlight on. 
        This isn't really an LCD command, but some modules have backlight 
        controls, so this allows the hal to pass through the command. 
        """ 
        self.backlight = True 
        self.hal_backlight_on() 
    def backlight_off(self): 
        """Turns the backlight off. 
        This isn't really an LCD command, but some modules have backlight 
        controls, so this allows the hal to pass through the command. 
        """ 
        self.backlight = False 
        self.hal_backlight_off() 
    def move_to(self, cursor_x, cursor_y): 
        """Moves the cursor position to the indicated position. The cursor 
        position is zero based (i.e. cursor_x == 0 indicates first column). 
        """ 
        self.cursor_x = cursor_x 
        self.cursor_y = cursor_y 
        addr = cursor_x & 0x3f 
        if cursor_y & 1: 
            addr += 0x40    # Lines 1 & 3 add 0x40 
        if cursor_y & 2:    # Lines 2 & 3 add number of columns 
            addr += self.num_columns 
        self.hal_write_command(self.LCD_DDRAM | addr) 
    def putchar(self, char): 
        """Writes the indicated character to the LCD at the current cursor 
        position, and advances the cursor by one position. 
        """ 
        if char == '\n': 
            if self.implied_newline: 
                # self.implied_newline means we advanced due to a wraparound, 
                # so if we get a newline right after that we ignore it. 
                pass 
            else: 
                self.cursor_x = self.num_columns 
        else: 
            self.hal_write_data(ord(char)) 
            self.cursor_x += 1 
        if self.cursor_x >= self.num_columns: 
            self.cursor_x = 0 
            self.cursor_y += 1 
            self.implied_newline = (char != '\n') 
        if self.cursor_y >= self.num_lines: 
            self.cursor_y = 0 
        self.move_to(self.cursor_x, self.cursor_y) 
    def putstr(self, string): 
        """Write the indicated string to the LCD at the current cursor 
        position and advances the cursor position appropriately. 
        """ 
        for char in string: 
            self.putchar(char) 
    def custom_char(self, location, charmap): 
        """Write a character to one of the 8 CGRAM locations, available 
        as chr(0) through chr(7). 
        """ 
        location &= 0x7 
        self.hal_write_command(self.LCD_CGRAM | (location << 3)) 
        self.hal_sleep_us(40) 
        for i in range(8): 
            self.hal_write_data(charmap[i]) 
            self.hal_sleep_us(40) 
        self.move_to(self.cursor_x, self.cursor_y)
        
    def hal_backlight_on(self): 
        """Allows the hal layer to turn the backlight on. 
        If desired, a derived HAL class will implement this function. 
        """ 
        pass 
    def hal_backlight_off(self): 
        """Allows the hal layer to turn the backlight off. 
        If desired, a derived HAL class will implement this function. 
        """ 
        pass 
    def hal_write_command(self, cmd): 
        """Write a command to the LCD. 
        It is expected that a derived HAL class will implement this 
        function. 
        """ 
        raise NotImplementedError 
    def hal_write_data(self, data): 
        """Write data to the LCD. 
        It is expected that a derived HAL class will implement this 
        function. 
        """ 
        raise NotImplementedError 
    def hal_sleep_us(self, usecs): 
        """Sleep for some time (given in microseconds).""" 
        time.sleep_us(usecs)


lcd_api.py

# Copyright (c) 2015-2019 Volodymyr Shymanskyy. See the file LICENSE for copying permission.

__version__ = "1.0.0"

import struct
import time
import sys
import os

try:
    import machine
    gettime = lambda: time.ticks_ms()
    SOCK_TIMEOUT = 0
except ImportError:
    const = lambda x: x
    gettime = lambda: int(time.time() * 1000)
    SOCK_TIMEOUT = 0.05

def dummy(*args):
    pass

MSG_RSP = const(0)
MSG_LOGIN = const(2)
MSG_PING  = const(6)

MSG_TWEET = const(12)
MSG_NOTIFY = const(14)
MSG_BRIDGE = const(15)
MSG_HW_SYNC = const(16)
MSG_INTERNAL = const(17)
MSG_PROPERTY = const(19)
MSG_HW = const(20)
MSG_HW_LOGIN = const(29)
MSG_EVENT_LOG = const(64)

MSG_REDIRECT  = const(41)  # TODO: not implemented
MSG_DBG_PRINT  = const(55) # TODO: not implemented

STA_SUCCESS = const(200)
STA_INVALID_TOKEN = const(9)

DISCONNECTED = const(0)
CONNECTING = const(1)
CONNECTED = const(2)

print("""
    ___  __          __
   / _ )/ /_ _____  / /__
  / _  / / // / _ \\/  '_/
 /____/_/\\_, /_//_/_/\\_\\
        /___/ for Python v""" + __version__ + " (" + sys.platform + ")\n")

class EventEmitter:
    def __init__(self):
        self._cbks = {}

    def on(self, evt, f=None):
        if f:
            self._cbks[evt] = f
        else:
            def D(f):
                self._cbks[evt] = f
                return f
            return D

    def emit(self, evt, *a, **kv):
        if evt in self._cbks:
            self._cbks[evt](*a, **kv)


class BlynkProtocol(EventEmitter):
    def __init__(self, auth, tmpl_id=None, fw_ver=None, heartbeat=50, buffin=1024, log=None):
        EventEmitter.__init__(self)
        self.heartbeat = heartbeat*1000
        self.buffin = buffin
        self.log = log or dummy
        self.auth = auth
        self.tmpl_id = tmpl_id
        self.fw_ver = fw_ver
        self.state = DISCONNECTED
        self.connect()

    def virtual_write(self, pin, *val):
        self._send(MSG_HW, 'vw', pin, *val)

    def send_internal(self, pin, *val):
        self._send(MSG_INTERNAL,  pin, *val)

    def set_property(self, pin, prop, *val):
        self._send(MSG_PROPERTY, pin, prop, *val)

    def sync_virtual(self, *pins):
        self._send(MSG_HW_SYNC, 'vr', *pins)

    def log_event(self, *val):
        self._send(MSG_EVENT_LOG, *val)

    def _send(self, cmd, *args, **kwargs):
        if 'id' in kwargs:
            id = kwargs.get('id')
        else:
            id = self.msg_id
            self.msg_id += 1
            if self.msg_id > 0xFFFF:
                self.msg_id = 1
                
        if cmd == MSG_RSP:
            data = b''
            dlen = args[0]
        else:
            data = ('\0'.join(map(str, args))).encode('utf8')
            dlen = len(data)
        
        self.log('<', cmd, id, '|', *args)
        msg = struct.pack("!BHH", cmd, id, dlen) + data
        self.lastSend = gettime()
        self._write(msg)

    def connect(self):
        if self.state != DISCONNECTED: return
        self.msg_id = 1
        (self.lastRecv, self.lastSend, self.lastPing) = (gettime(), 0, 0)
        self.bin = b""
        self.state = CONNECTING
        self._send(MSG_HW_LOGIN, self.auth)

    def disconnect(self):
        if self.state == DISCONNECTED: return
        self.bin = b""
        self.state = DISCONNECTED
        self.emit('disconnected')

    def process(self, data=None):
        if not (self.state == CONNECTING or self.state == CONNECTED): return
        now = gettime()
        if now - self.lastRecv > self.heartbeat+(self.heartbeat//2):
            return self.disconnect()
        if (now - self.lastPing > self.heartbeat//10 and
            (now - self.lastSend > self.heartbeat or
             now - self.lastRecv > self.heartbeat)):
            self._send(MSG_PING)
            self.lastPing = now
        
        if data != None and len(data):
            self.bin += data

        while True:
            if len(self.bin) < 5:
                break

            cmd, i, dlen = struct.unpack("!BHH", self.bin[:5])
            if i == 0: return self.disconnect()
                      
            self.lastRecv = now
            if cmd == MSG_RSP:
                self.bin = self.bin[5:]

                self.log('>', cmd, i, '|', dlen)
                if self.state == CONNECTING and i == 1:
                    if dlen == STA_SUCCESS:
                        self.state = CONNECTED
                        dt = now - self.lastSend
                        info = ['ver', __version__, 'h-beat', self.heartbeat//1000, 'buff-in', self.buffin, 'dev', sys.platform+'-py']
                        if self.tmpl_id:
                            info.extend(['tmpl', self.tmpl_id])
                            info.extend(['fw-type', self.tmpl_id])
                        if self.fw_ver:
                            info.extend(['fw', self.fw_ver])
                        self._send(MSG_INTERNAL, *info)
                        try:
                            self.emit('connected', ping=dt)
                        except TypeError:
                            self.emit('connected')
                    else:
                        if dlen == STA_INVALID_TOKEN:
                            self.emit("invalid_auth")
                            print("Invalid auth token")
                        return self.disconnect()
            else:
                if dlen >= self.buffin:
                    print("Cmd too big: ", dlen)
                    return self.disconnect()

                if len(self.bin) < 5+dlen:
                    break

                data = self.bin[5:5+dlen]
                self.bin = self.bin[5+dlen:]

                args = list(map(lambda x: x.decode('utf8'), data.split(b'\0')))

                self.log('>', cmd, i, '|', ','.join(args))
                if cmd == MSG_PING:
                    self._send(MSG_RSP, STA_SUCCESS, id=i)
                elif cmd == MSG_HW or cmd == MSG_BRIDGE:
                    if args[0] == 'vw':
                        self.emit("V"+args[1], args[2:])
                        self.emit("V*", args[1], args[2:])
                elif cmd == MSG_INTERNAL:
                    self.emit("internal:"+args[0], args[1:])
                elif cmd == MSG_REDIRECT:
                    self.emit("redirect", args[0], int(args[1]))
                else:
                    print("Unexpected command: ", cmd)
                    return self.disconnect()

import socket

class Blynk(BlynkProtocol):
    def __init__(self, auth, **kwargs):
        self.insecure = kwargs.pop('insecure', False)
        self.server = kwargs.pop('server', 'blynk.cloud')
        self.port = kwargs.pop('port', 80 if self.insecure else 443)
        BlynkProtocol.__init__(self, auth, **kwargs)
        self.on('redirect', self.redirect)

    def redirect(self, server, port):
        self.server = server
        self.port = port
        self.disconnect()
        self.connect()

    def connect(self):
        print('Connecting to %s:%d...' % (self.server, self.port))
        s = socket.socket()
        s.connect(socket.getaddrinfo(self.server, self.port)[0][-1])
        try:
            s.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
        except:
            pass
        if self.insecure:
            self.conn = s
        else:
            try:
                import ussl
                ssl_context = ussl
            except ImportError:
                import ssl
                ssl_context = ssl.create_default_context()
            self.conn = ssl_context.wrap_socket(s, server_hostname=self.server)
        try:
            self.conn.settimeout(SOCK_TIMEOUT)
        except:
            s.settimeout(SOCK_TIMEOUT)
        BlynkProtocol.connect(self)

    def _write(self, data):
        #print('<', data)
        self.conn.write(data)
        # TODO: handle disconnect

    def run(self):
        data = b''
        try:
            data = self.conn.read(self.buffin)
            #print('>', data)
        except KeyboardInterrupt:
            raise
        except: # TODO: handle disconnect
            return
        self.process(data)


BlynkLib.py


"""
    BlynkTimer
    blynk-library-python

    Module for launching timed Blynk actions
    with polling

"""

import time


class BlynkTimer:
    '''Executes functions after a defined period of time'''
    _MAX_TIMERS = 16

    def __init__(self):
        self.timers = []
        self.ids = self._get_unique_id()

    def _get_unique_id(self, current=0):
        '''yields unique id for new timer'''
        numId = current
        while numId < self._MAX_TIMERS:
            yield numId
            numId += 1

    def _add(self, func, **kwargs):
        '''Inits Timer'''
        timerId = next(self.ids)
        timer = Timer(timerId, func, **kwargs)
        self.timers.append(timer)
        return timer

    def _get(self, timerId):
        '''Gets timer by id'''
        timer = [t for t in self.timers if t.id == timerId]
        if len(timer) <= 0:
            return None
        return timer[0]

    def _delete(self, timerId):
        '''Deletes timer'''
        timer = self._get(timerId)
        timer.disable()
        self.timers = [t for t in self.timers if t.id != timerId]
        num_timers = self.get_num_timers()[0]
        self.ids = self._get_unique_id(current=num_timers)
        return timerId

    def get_num_timers(self):
        '''Returns number of used timer slots'''
        num_timers = len(self.timers)
        return (num_timers, self._MAX_TIMERS)

    def is_enabled(self, timerId):
        '''Returns true if timer is enabled'''
        timer = self._get(timerId)
        return timer.enabled

    def set_interval(self, value, func):
        '''Sets time interval for function'''
        timer = self._add(func)
        timer.set_interval(value)
        return timer.id

    def set_timeout(self, value, func):
        '''Runs function once after timeout'''
        timer = self._add(func, post_run=self._delete)
        timer.set_interval(value)
        return timer.id

    def enable(self, timerId):
        '''Enables timer'''
        timer = self._get(timerId)
        timer.enable()
        return timerId

    def disable(self, timerId):
        '''Disables timer'''
        timer = self._get(timerId)
        timer.disable()
        return timerId

    def run(self):
        '''Polls timers'''
        [t.run() for t in self.timers]


class Timer:
    '''Runs function after specific interval'''

    def __init__(self, id, func, **kwargs):
        self.id = id
        self.func = func
        self.interval = None
        self.start_time = None
        self.enabled = False
        self.on_post_run = kwargs.get('post_run', None)

    def _handle_post_run(self):
        '''handles post run events'''
        self.start_time += self.interval
        if self.on_post_run:
            return self.on_post_run(self.id)

    def enable(self):
        '''enables Timer'''
        self.enabled = True
        self.start_time = time.time()

    def disable(self):
        '''disables timer'''
        self.enabled = False
        self.start_time = None

    def set_interval(self, value):
        '''Sets Time Interval for calling function'''
        self.interval = value
        self.enable()

    def run(self):
        '''Runs function if interval has passed'''
        if not self.enabled:
            return
        now = time.time()
        if now - self.start_time > self.interval:
            self.func()
            self._handle_post_run()
