8000 Added ep8266 ADC example · librarysteve/lib-python@d1775f2 · GitHub
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Added ep8266 ADC example
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‎examples/esp8266/01_potentiometer.py

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# -*- coding: utf-8 -*-
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"""
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[Slide Potentiometer NodeMcu ESP8266] ===============================================================================
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ESP8266 pinout:
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https://i.imgur.com/HgVTxCh.png
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Slide Potentiometer:
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- connect VCC sensor line to "+3.3v" board pin
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- connect GND sensor line to "ground" board pin
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- connect DATA sensor line to board A0 pib (ADC - analog to digital conversion on dedicated pin)
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Environment prepare:
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In your Blynk App project:
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- add "Gauge" widget,
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- bind it to Virtual Pin V1
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- set name "Potentiometer"
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- set label /pin.##/
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- set update time=1 sec and assign 0-1024 values range to it
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- Run the App (green triangle in the upper right corner).
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- define SSID and WiFi password that will be used by ESP32 board
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- define your auth token for current example and run it
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This started program will periodically call and execute event handler "read_virtual_pin_handler".
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that will try to get data from potentiometer and write it to related virtual pin.
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Within App widget gauge value will be updated each 1 sec.
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=====================================================================================================================
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Additional info about blynk you can find by examining such resources:
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Downloads, docs, tutorials: http://www.blynk.cc
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Sketch generator: http://examples.blynk.cc
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Blynk community: http://community.blynk.cc
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Social networks: http://www.fb.com/blynkapp
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http://twitter.com/blynk_app
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=====================================================================================================================
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"""
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import blynklib
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import network
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import utime as time
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import machine
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WIFI_SSID = 'YourWifiSSID'
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WIFI_PASS = 'YourWifiPassword'
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BLYNK_AUTH = 'YourAuthToken'
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print("Connecting to WiFi network '{}'".format(WIFI_SSID))
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wifi = network.WLAN(network.STA_IF)
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wifi.active(True)
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wifi.connect(WIFI_SSID, WIFI_PASS)
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while not wifi.isconnected():
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time.sleep(1)
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print('WiFi connect retry ...')
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print('WiFi IP:', wifi.ifconfig()[0])
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print("Connecting to Blynk server...")
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blynk = blynklib.Blynk(BLYNK_AUTH)
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adc = machine.ADC(0)
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@blynk.handle_event('read V1')
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def read_handler(vpin):
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p_value = adc.read()
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print('Current potentiometer value={}'.format(p_value))
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blynk.virtual_write(vpin, p_value)
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while True:
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blynk.run()

‎examples/esp8266/README.md

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@@ -118,7 +118,7 @@ Examine [this document][blynk-esp32-readme] to get more details how to compile *
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***Note!!*** During custom firmware creation your libraries will be converted and adopted to esp8266 environment
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automatically. So you can create custom build and then just copy *.mpy files from docker system
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```bash
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docker cp micropython:/micropython/ports/esp8266/build/frozen_mpy/blinklib.mpy blinklib.mpy
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docker cp micropython:/micropython/ports/esp8266/build/frozen_mpy/blynklib.mpy blynklib.mpy
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```
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After *.mpy files can be placed to **/lib** directory of esp8266 board with **ampy** tool and simply imported

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