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09_sync_virtual_pin.py
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"""
[VIRTUAL PIN SYNC EXAMPLE] ==========================================================================================
Environment prepare:
In your Blynk App project:
- add 3 "Button" widgets,
- bind then to Virtual Pins V0, V1, v2
- set mode "SWITCH" for all of them
- Run the App (green triangle in the upper right corner).
- define your auth token for current example and run it
This started program will restore on connect write_virtual_pin states and colors.
Buttons states and colors can be modified during script run.
If script was interrupted (KeyboardInterrupt) buttons colors will be changed to red.
During next connect event ( script re-run) previous buttons states and colors will be restored.
Schema:
=====================================================================================================================
+-----------+ +--------------+ +--------------+
| | | | | |
| blynk lib | | blynk server | | blynk app |
| | | virtual pin | | |
| | | | | |
+-----+-----+ +------+-------+ +-------+------+
connect handler | | |
+--------+ | |
| +------------------------------------>+ |
| | virtual pin sync | |
| +<------------------------------------+----------------------------------->+
| | virtual pin write stored value | send pin value to app |
| +<------------------------------------+----------------------------------->+
| | virtual pin apply stored properties | send pin properties to app |
+------->+ | |
write handler | | |
+--------+ +<-----------------------------------+
| +<------------------------------------+ write event from button |
+>------>+ write event form server | |
| | |
| | |
disconnect | | |
handler | | |
+-------+ | |
| +------------------------------------>+ |
+------>+ set new virtual pin property | |
| | |
| | |
| | |
+ + +
=====================================================================================================================
Additional info about blynk you can find by examining such resources:
Downloads, docs, tutorials: https://blynk.io
Sketch generator: http://examples.blynk.cc
Blynk community: http://community.blynk.cc
Social networks: http://www.fb.com/blynkapp
http://twitter.com/blynk_app
=====================================================================================================================
"""
import logging
import blynklib
# tune console logging
_log = logging.getLogger('BlynkLog')
logFormatter = logging.Formatter("%(asctime)s [%(levelname)s] %(message)s")
consoleHandler = logging.StreamHandler()
consoleHandler.setFormatter(logFormatter)
_log.addHandler(consoleHandler)
_log.setLevel(logging.DEBUG)
colors = {'1': '#FFC300', '0': '#CCCCCC', 'OFFLINE': '#FF0000'}
BLYNK_AUTH = 'YourAuthToken'
blynk = blynklib.Blynk(BLYNK_AUTH, log=_log.info)
@blynk.handle_event("connect")
def connect_handler():
_log.info('SCRIPT_START')
for pin in range(3):
_log.info('Syncing virtual pin {}'.format(pin))
blynk.virtual_sync(pin)
# within connect handler after each server send operation forced socket reading is required cause:
# - we are not in script listening state yet
# - without forced reading some portion of blynk server messages can be not delivered to HW
blynk.read_response(timeout=0.5)
@blynk.handle_event('write V*')
def write_handler(pin, value):
button_state = value[0]
blynk.set_property(pin, 'color', colors[button_state])
@blynk.handle_event("disconnect")
def connect_handler():
for pin in range(3):
_log.info("Set 'OFFLINE' color for pin {}".format(pin))
blynk.set_property(pin, 'color', colors['OFFLINE'])
###########################################################
# infinite loop that waits for event
###########################################################
try:
while True:
blynk.run()
except KeyboardInterrupt:
blynk.disconnect()
_log.info('SCRIPT WAS INTERRUPTED')