Programando para IoT con Micropython

@woakas CTO at Ubidots

PyConAr 2017

Gustavo Angulo

• I'm Colombian
• 40 coffes per week
• Co-Founder - CTO - Ubidots.
• Hacker.
• Musician.

Noviembre 13, 2013

What? Why Python?

Ready

Each module is either written from scratch or ported from CPython.

The board

• Based on the STM32F405 microcontroller(32 bit ARM Cortex M4)
• CPU 168MHz
• 1MiB flash
• 192KiB RAM

Differences to CPython

• MicroPython does not implement complete CPython
• MicroPython implements only subset of functionality and parameters of particular functions and classes.
• print() function does not check for recursive data structures in the same way CPython does.

https://github.com/micropython/micropython/wiki/Differences

Libraries

• asyncio
• calendar
• datetime
• functools
• gzip
• mqtt
• ....
• ....

https://github.com/micropython/micropython-lib

Examples

Subtitle

import machine
import time

pin = machine.Pin(2, machine.Pin.OUT)
for i in range(10):
    pin.on()
    time.sleep(1)
    pin.off()
    time.sleep(1)

Hello World

REPL (Read-Eval-Print-Loop)

Eval

import time
import machine

led = machine.Pin(2, machine.Pin.OUT)

eval("led.on()")

Save program

a = """import time
from machine import Pin
led = Pin(2, mode=Pin.OUT, value=0)
for i in range(10):
    led.on()
    time.sleep(0.1)
    led.off()
    time.sleep(0.1)
"""

with open('main.py', 'w') as f:
    f.write(a)

Threads

import _thread
import time

def th_func(delay, id):
    while True:
        time.sleep(delay)
        print('Running thread %d' % id)

for i in range(3):
    _thread.start_new_thread(th_func, (i + 1, i))

Weeeeee

Asyncio

import uasyncio
import uasyncio as asyncio
loop = asyncio.get_event_loop()

async def bar():
    count = 0
    while True:
        count += 1
        print(count)
        await asyncio.sleep(1)



loop.create_task(bar())
loop.run_forever()

Asyncio

Micropython-lib

• uasyncio
• pystone
• pickle
• ....
• ....

• pyb
• random
• smtplib
• ....
• ....

IoT

Micropython

References

• https://docs.pycom.io/pycom_esp32/pycom_esp32/getstarted.html
• https://github.com/micropython/micropython/wiki/Getting-Started