Micropython Installation

• https://docs.micropython.org/en/latest/esp8266/general.html
• https://docs.micropython.org/en/latest/esp32/quickref.html
• https://docs.zerynth.com/latest/official/board.zerynth.nodemcu_esp32/docs/index.html

• Getting a MicroPython REPL prompt

• https://learn.adafruit.com/micropython-basics-loading-modules/frozen-modules
• https://github.com/micropython/micropython-lib
• https://github.com/adafruit/circuitpython

• https://docs.micropython.org/en/latest/develop/porting.html
• https://www.snaums.de/informatik/porting-micropython-to-bare-metal-raspberry-pi.html
• https://www.snaums.de/informatik/porting-micropython-to-the-raspberry-pi-part-2.html
• https://forum.micropython.org/viewtopic.php?t=5779

from machine import Pin
from time import sleep
 
led = Pin(2, Pin.OUT) # sets PIN 2 as Output (most boards have an LED connected)
 
while True:
  led.value(not led.value())  # toggle LED status
  sleep(0.25)

from machine import Pin, PWM
from time import sleep
 
frequency = 5000 # Hz: can be a value between 0 and 78125
led = PWM(Pin(2), frequency)
 
while True:
  for duty_cycle in range(0, 1024): #can be a value between 0 and 1023 (100%)
    led.duty(duty_cycle)
    sleep(0.005)

Quelle: https://randomnerdtutorials.com/esp32-esp8266-pwm-micropython/

• https://boneskull.com/micropython-on-esp32-part-2/
• https://randomnerdtutorials.com/micropython-mqtt-esp32-esp8266/

import network
from umqtt.robust import MQTTClient
 
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('<YOUR SSID>', '<YOUR PASSWORD>')
 
client = MQTTClient('<CLIENT-ID>', '<BROKER>')
client.connect()
client.publish('<TOPIC>', '<BYTE_STRING>')

• https://www.youtube.com/watch?v=UXt27kOokh0 - MicroPython I2S Audio with the ESP32
• https://github.com/miketeachman/micropython-i2s-examples

• https://randomnerdtutorials.com/micropython-bme280-esp32-esp8266/

• https://randomnerdtutorials.com/micropython-esp32-esp8266-dht11-dht22-web-server/

from machine import Pin
from time import sleep
import dht
 
PIN_NR = # define your PIN # here
 
sensor = dht.DHT22(Pin(PIN_NR))
 
while True:
   try:
      sensor.measure()
      temp = sensor.temperature()
      hum = sensor.humidity()
      if (isinstance(temp, float) and isinstance(hum, float)) or (isinstance(temp, int) and isinstance(hum, int)):
         msg = (b'{0:3.1f},{1:3.1f}'.format(temp, hum))
      print(msg)
   except OSError as e:
      print('Failed to read sensor.')
   sleep(2)

• https://www.hackster.io/user3282664/micropython-to-aws-iot-cc1c20

help('modules')
 
__main__          framebuf          socket            upip
_boot             gc                ssl               upip_utarfile
_onewire          hashlib           struct            upysh
_thread           heapq             sys               urandom
_webrepl          inisetup          time              ure
apa106            io                ubinascii         urequests
array             json              ucollections      uselect
binascii          machine           ucryptolib        usocket
btree             math              uctypes           ussl
builtins          micropython       uerrno            ustruct
cmath             neopixel          uhashlib          utime
collections       network           uhashlib          utimeq
dht               ntptime           uheapq            uzlib
ds18x20           onewire           uio               webrepl
errno             os                ujson             webrepl_setup
esp               random            umqtt/robust      websocket
esp32             re                umqtt/simple      websocket_helper
flashbdev         select            uos               zlib

>>> import gc
>>> gc.collect()
>>> gc.mem_free()
107488
>>> import micropython
>>> micropython.mem_info()