Turtorial Examples for ESP32-MicroPython

2020/3/9

Turtorial Examples for ESP32-MicroPython

ESP32

http://docs.micropython.org/en/latest/esp32/quickref.html

LED Blink

  from time import sleep
  from machine import Pin
  p0 = Pin(0, Pin.OUT, value=0) # external LED
  blink = 0
  while True:
     p0.value(0 if blink == 0 else 1)
     blink = ~blink
     sleep(0.1)

  

Pin/GPIO

  from machine import Pin
  p4 = Pin(4, Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
  p4.value() # 1 if open
  p4.value() # 0 if GND

  

PWM

  from time import sleep
  from machine import Pin, PWM

  pwm0 = PWM(Pin(0))  # create PWM object from a pin
  pwm0.freq(1000)     # set frequency
  for p in range(100):
    pwm0.duty(10*p)
    sleep(0.05)
  for p in range(100):
    pwm0.duty(1000-10*p)
    sleep(0.05)

  pwm0.deinit() # turn off PWM on the pin
  

ADC

以下のピンがAnalogInとして使用できる:
0, 2, 4, 12, 13, 14, 15, 25, 26, 27, 32, 33, 34, 35, 36, 39
デフォルトのレンジは、0-4095(変更可能)

  from machine import Pin, ADC
  from time import sleep

  p34 = ADC(Pin(34))          # create ADC object on ADC pin
  p34.read()                  # read value, 0-4095 across voltage range 0.0v - 1.0v
  p34.atten(ADC.ATTN_11DB)    # set 11dB input attenuation (voltage range roughly 0.0v - 3.6v)
  p34.width(ADC.WIDTH_9BIT)   # set 9 bit return values (returned range 0-511)

  while True:
    print(p34.read())
    sleep(0.1)

  

SPI

  from machine import Pin, SDCard
  import os
  sd = SDCard(slot=3, width=1, sck=Pin(14), mosi=Pin(13), miso=Pin(12),cs=Pin(15))　# slot#3を使用する
  os.mount(sd, '/sd')

  os.chdir('/sd')
  os.listdir()
  出力例：
  ['lib', 'ESP32_OSCrecvBundled_test.py', 'ESP32_demo_neopixel.py', 'ESP32_starwars.py', 'M5S_OSCrecvBundled_test.py', 'TEST.txt', 'sdmain.py', 'wlan.py']
  # この時点でエラーがなく、SDのファイルが表示されたら動作確認としてはＯＫとなる

  import sys
  sys.path
  出力例：
  ['', '/lib']

  sys.path[1]='/sd/lib'　# ライブラリのパスをSDに切り替える
  import ESP32_OSCrecvBundled_test # SDに置いてあるプログラム(ESP32_OSCrecvBundled_test.py)をロードして実行する

  

I2C

ESP8266_TMP102_test.py

  # ESP8266/ESP32
  import utime
  from machine import Pin, I2C
  from tmp102 import Tmp102
  i2c = I2C(scl=Pin(5), sda=Pin(4), freq=100000)
  sensor = Tmp102(i2c, 0x48)

  while True:
     print('Temperature: {0:.1f}'.format(sensor.temperature))
     utime.sleep(2)

  

RTC

from machine import RTC

  rtc = RTC()
  rtc.datetime((2020, 3, 9, 1, 8, 53, 0, 0)) # set a specific date and time
  # The 8-tuple has the following format:
  # (year, month, day, weekday, hours, minutes, seconds, subseconds)
  # weekday is 1-7 for Monday through Sunday.
  # subseconds counts down from 255 to 0

  rtc.datetime() # get date and time

  

ESP32_8266_clock.py
以下は自分の環境に合わせる：
ssid = 'your_ssid'
password = 'your_passwd'

  # NIC setup
  import network, socket

  WIFI_SSID = "your_ssid"
  WIFI_PASSWD = "your_passwd"

  def wlan_connect(ssid='SSID', password='PASSWD'):
      import network
      wlan = network.WLAN(network.STA_IF)
      if not wlan.active() or not wlan.isconnected():
          wlan.active(True)
          print('connecting to:', ssid)
          wlan.connect(ssid, password)
          while not wlan.isconnected():
              pass


  wlan_connect(ssid=WIFI_SSID, password=WIFI_PASSWD)

  #==========================================
  # ESP32_8266_clock.py

  from machine import Pin, RTC
  import network, urequests, utime
  import ujson
  rtc = RTC()

  url_jst = "http://worldtimeapi.org/api/timezone/Asia/Tokyo" # see http://worldtimeapi.org/timezones

  retry_delay = 5000 # interval time of retry after a failed Web query
  response = urequests.get(url_jst)

  # parse JSON
  parsed = response.json()
  #parsed=ujson.loads(res) # in case string
  datetime_str = str(parsed["datetime"])
  year = int(datetime_str[0:4])
  month = int(datetime_str[5:7])
  day = int(datetime_str[8:10])
  hour = int(datetime_str[11:13])
  minute = int(datetime_str[14:16])
  second = int(datetime_str[17:19])
  subsecond = int(round(int(datetime_str[20:26]) / 10000))

  # update internal RTC
  rtc.datetime((year, month, day, 0, hour, minute, second, subsecond))

  # setup day of the week
  daysOfTheWeek = "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
  tm = utime.localtime(utime.mktime(utime.localtime()))

  while True:
    # generate formated date/time strings from internal RTC
    date_str = "Date: {0:4d}/{1:02d}/{2:02d}".format(*rtc.datetime())+' ('+daysOfTheWeek[tm[6]]+')'
    time_str = "Time: {4:02d}:{5:02d}:{6:02d}".format(*rtc.datetime())
    print(date_str)
    print(time_str)
    print('-----------')
    utime.sleep(1)

  #=============================================
  

NeoPixel

  # neopixel simple test
  from machine import Pin
  from neopixel import NeoPixel
  pin = Pin(2, Pin.OUT)
  np = NeoPixel(pin, 8) 
  np[0] = (255, 255, 255)
  np[1] = (255, 255, 0)
  np[2] = (255, 0, 0)
  np[3] = (0, 255, 255)
  np[4] = (0, 255, 0)
  np[5] = (0, 0, 255)
  np[6] = (255, 255,0)
  np[7] = (255, 0, 0)
  np.write()

  

DHT

ESP8266_demo_DHT11.py

  # ESP8266/ESP32
  from dht import DHT11
  import machine
  from time import sleep

  d = DHT11(machine.Pin(14))
  while True:
     d.measure()
     tempe=d.temperature()
     humi=d.humidity()
     print('tempe:'+str(tempe)+ ' humi:'+str(humi))
     sleep(1)

  

Networking

以下は自分の環境に合わせる：
ssid = 'your_ssid'
password = 'your_passwd'

  # NIC setup
  import network, socket

  WIFI_SSID = "your_ssid"
  WIFI_PASSWD = "your_passwd"

  def wlan_connect(ssid='SSID', password='PASSWD'):
      import network
      wlan = network.WLAN(network.STA_IF)
      if not wlan.active() or not wlan.isconnected():
          wlan.active(True)
          print('connecting to:', ssid)
          wlan.connect(ssid, password)
          while not wlan.isconnected():
              pass


  wlan_connect(ssid=WIFI_SSID, password=WIFI_PASSWD)

  

Performance Test

performanceTestESP32.py

  # Peformace Test for ESP32
  from machine import RTC
  rtc = RTC()
  rtc.datetime((2020, 2, 9, 1, 12, 48, 0, 0))
  # (year, month, day, weekday, hours, minutes, seconds, subseconds)

  def performanceTest():
      secs = rtc.datetime()[6]
      endTime = secs + 10
      count = 0
      while rtc.datetime()[6] < endTime:
          count += 1
      print("Count: ", count)

  performanceTest()

  

以上