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lib-python/examples/02_read_virtual_pin.py at master · segallis/lib-python · GitHub
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02_read_virtual_pin.py
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"""
[READ VIRTUAL PIN EXAMPLE] ========================================================================
Environment prepare:
In your Blynk App project:
- add "Value Display" widget,
- bind it to Virtual Pin V11,
- set values range 0-255
- set the read frequency to 5 second.
- optionally to have more visibility you can add "LED" widget and assign Virtual Pin V11 to it
- Run the App (green triangle in the upper right corner).
- define your auth token for current example and run it
This started program will periodically call and execute event handler "read_virtual_pin_handler".
Calling virtual_write operation inside handler updates widget value.
In app you can see updated values and optionally LED brightness change.
Schema:
=====================================================================================================
+-----------+ +--------------+ +--------------+
| | | | | |
| blynk lib | | blynk server | | blynk app |
| | | virtual pin | | |
| | | | | |
+-----------+ +--------------+ +--------------+
| | |
| | |
| | widget read frequency = 5 sec |
| +<-----------------------------------+
| | |
| | |
| | send virtual pin value to widget |
| | |
event handler | read event to hw from server +----------------------------------->+
(user function) | | |
+-----------<------------------------------------+ |
| | | |
| | write random 0-255 value to pin | |
+--------->------------------------------------->+ next widget read event |
| | |
| +<-----------------------------------+
| | |
| | |
+ + +
====================================================================================================
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
blynklib
import
random
BLYNK_AUTH
=
'YourAuthToken'
# initialize blynk
blynk
=
blynklib
.
Blynk
(
BLYNK_AUTH
)
READ_PRINT_MSG
=
"[READ_VIRTUAL_PIN_EVENT] Pin: V{}"
# register handler for virtual pin V11 reading
@
blynk
.
handle_event
(
'read V11'
)
def
read_virtual_pin_handler
(
pin
):
print
(
READ_PRINT_MSG
.
format
(
pin
))
blynk
.
virtual_write
(
pin
,
random
.
randint
(
0
,
255
))
###########################################################
# infinite loop that waits for event
###########################################################
while
True
:
blynk
.
run
()
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