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Difference between revisions of "MicroPython"

From Chalmers Robotics

(GPIO)
(WS2812)
Line 68: Line 68:
 
from neopixel import NeoPixel
 
from neopixel import NeoPixel
  
np = neopixel.NeoPixel(machine.Pin(2), 3)
+
np = NeoPixel(Pin(2), 3)
  
 
np[0] = (255, 0, 0)
 
np[0] = (255, 0, 0)

Revision as of 12:40, 22 April 2018

MicroPython

a software implementation of the Python 3 programming language, written in C, that is optimized to run on a microcontroller

Micropython-logo.svg.png https://docs.micropython.org/en/latest/pyboard/

NodeMCU Devkit

Nodemcu.jpg

  • ESP8266 a microcontroller from Espressif
  • Integrated WiFi
  • 80MHz clock speed

Install

http://docs.micropython.org/en/v1.8.2/esp8266/esp8266/tutorial/intro.html#deploying-the-firmware

http://micropython.org/download#esp8266

wget http://micropython.org/resources/firmware/esp8266-20171101-v1.9.3.bin
pip install esptool
esptool.py --port /dev/ttyUSB0 write_flash 0 esp8266-20171101-v1.9.3.bin
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=8m 0 esp8266-20171101-v1.9.3.bin

Connect through serial

screen /dev/ttyUSB0 115200

Stäng screen: Ctrl+A, k, y

Connect to WiFi

http://docs.micropython.org/en/v1.8.7/esp8266/esp8266/tutorial/network_basics.html

import network

ap_if = network.WLAN(network.AP_IF)
ap_if.disconnect()

sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)

sta_if.connect('SSID', 'password')
sta_if.ifconfig()

HTTP GET

import urequests
response = urequests.get("http://tim.gremalm.se/hello")
response.text
response.close()


WS2812

http://docs.micropython.org/en/v1.8.2/esp8266/esp8266/tutorial/neopixel.html

from machine import Pin
from neopixel import NeoPixel

np = NeoPixel(Pin(2), 3)

np[0] = (255, 0, 0)
np[1] = (0, 128, 0)
np[2] = (0, 0, 64)
np.write()

GPIO

https://docs.micropython.org/en/latest/esp8266/esp8266/tutorial/pins.html

from machine import Pin
button = Pin(0)
button = Pin(0, Pin.IN, Pin.PULL_UP)
pin.value()

[1] NodeMCUPinout.png

File system on flash

import os
os.listdir()
os.remove('filename')

Connect through WEBrepl (websocket)

https://micropython.org/webrepl/

https://learn.adafruit.com/micropython-basics-esp8266-webrepl/access-webrepl

import webrepl_setup

ampy

https://github.com/adafruit/ampy

a file utility tool for MicroPython on ESP8266

Workshop resources