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.
Libraries
- asyncio
- calendar
- datetime
- functools
- gzip
- mqtt
- ....
- ....
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
- ....
- ....