Martin Nelbren Cuellar

Martin Nelbren Cuellar

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Visualization in Arduino of SIB with MicroPython

Updated: 4 minute read

Visualization in Arduino of SIB with MicroPython

Introduction

See Introduction of Internet of the Things in previous article of Visualization in Arduino of the System Information Bar

Objective

This article will show how to automate the deployment of information that is stored in a text file on a web page server, in which its updated by the program System Information Bar, using MicroPython.

MicroPython is a lean and efficient implementation of the Python 3 programming language that includes a small subset of the Python standard library and is optimised to run on microcontrollers and in constrained environments.

The MicroPython pyboard is a compact electronic circuit board that runs MicroPython on the bare metal, giving you a low-level Python operating system that can be used to control all kinds of electronic projects.

MicroPython is packed full of advanced features such as an interactive prompt, arbitrary precision integers, closures, list comprehension, generators, exception handling and more. Yet it is compact enough to fit and run within just 256k of code space and 16k of RAM.

MicroPython aims to be as compatible with normal Python as possible to allow you to transfer code with ease from the desktop to a microcontroller or embedded system.

Software

Hardware

Code

  • Repository in Github
    • Fritzing
    • ampy

      • Configuration

        Item Value
        Port Assigned by driver
        Speed 115200
        SSID Assigned by user
        Password Assigned by user

      • Display_on_Arduino_of_System_Information_Bar_-_esp8266_nodemcu.py

        # Display_on_Arduino_of_System_Information_Bar_-_esp8266_nodemcu.py
# v0.0.1 - 2018-11-12 - nelbren.com
from machine import Pin, I2C
from esp8266_i2c_lcd import I2cLcd
import network, utime, urequests as requests
import wifi

link = "http://104.251.217.217/si.txt"
LCD_COLS,LCD_ROWS = 20,4; n = 0
i2c = I2C(scl=Pin(5), sda=Pin(4), freq=100000)
lcd = I2cLcd(i2c, 0x27, LCD_ROWS, LCD_COLS)

def wait_time():
  lcd.blink_cursor_off()
  lcd.move_to(LCD_COLS - 3, LCD_ROWS - 1)
  lcd.putstr('{:03}'.format(n))
  lcd.move_to(LCD_COLS - 1, LCD_ROWS - 1)
  lcd.blink_cursor_on()

def lcd_print(msg, r = 0):
  lcd.move_to(0, r)
  if len(msg) > LCD_COLS:
    if r >= LCD_ROWS - 1:
      lcd.putstr(msg[0:LCD_COLS - 3] + "...")
    else:
      lcd.putstr(msg[0:LCD_COLS])
      lcd_print(msg[LCD_COLS:], r + 1)
  else:  
    lcd.putstr(msg)

def setup():
  lcd.backlight_on()
  lcd_print("SSID: " + wifi.SSID, 0)
  nic = network.WLAN(network.STA_IF)
  nic.active(True)
  nic.connect(wifi.SSID, wifi.PASSWORD)
  n = 0
  while not nic.isconnected():
    lcd_print('{:020}'.format(n), 1)
    utime.sleep(1)
    n+=1
  lcd.clear()
  lcd_print("MYIP: " + nic.ifconfig()[0])

def display_error(msg, nn):
  global n
  lcd.clear()
  lcd_print(msg)
  lcd.backlight_on()
  n = nn

setup()
while True:
  wait_time()
  if n <= 0:
    n = 120
    try:
      r = requests.get(link)
    except:
      display_error('Communication error', 5)
      pass
    else:  
      if r.status_code == 200:
        lcd.backlight_on()
        lcd_print(r.text)
        utime.sleep(2)
        if r.text.find('*') == -1: lcd.backlight_off()
        r.close()
      else:      
        display_error('Get failed!', 5)
  else:
    utime.sleep(1)
  n-=1

      • Display_on_Arduino_of_System_Information_Bar_-_esp8266_nodemcu.py

Use

  1. Get 
    git clone https://github.com/nelbren/display_on_arduino_of_sib_with_micropython.git

    Output:

      Cloning into 'display_on_arduino_of_sib_with_micropython'...
  remote: Enumerating objects: 33, done.
  remote: Counting objects: 100% (33/33), done.
  remote: Compressing objects: 100% (26/26), done.
  remote: Total 33 (delta 8), reused 32 (delta 7), pack-reused 0
  Unpacking objects: 100% (33/33), done.
  2. Configuration 
    cd display_on_arduino_of_sib_with_micropython/micropython
./mpi.bash

    Output:

      Please copy 'cfg.bash.example' to 'cfg.bash', and change wifi and port config

    cp cfg.bash.example cfg.bash

    NOTE: Change the value of port in the file cfg.bash

  3. Flash
    • Erase 
       ./mpi.bash -fe

      Output:

       Sure? (Yes/Any=No):
 Yes
 esptool.py v2.5.1
 Serial port /dev/cu.SLAB_USBtoUART
 Connecting........_
 Detecting chip type... ESP8266
 Chip is ESP8266EX
 Features: WiFi
 MAC: 84:f3:eb:XX:XX:XX
 Uploading stub...
 Running stub...
 Stub running...
 Erasing flash (this may take a while)...
 Chip erase completed successfully in 6.9s
 Hard resetting via RTS pin...
    • Upload Firmware 
       ./mpi.bash -ff

      Output:

       Sure? (Yes/Any=No):
 Yes
 esptool.py v2.5.1
 Serial port /dev/cu.SLAB_USBtoUART
 Connecting........_
 Detecting chip type... ESP8266
 Chip is ESP8266EX
 Features: WiFi
 MAC: 84:f3:eb:XX:XX:XX
 Uploading stub...
 Running stub...
 Stub running...
 Configuring flash size...
 Auto-detected Flash size: 4MB
 Flash params set to 0x0040
 Compressed 604872 bytes to 394893...
 Wrote 604872 bytes (394893 compressed) at 0x00000000 in 34.9 seconds (effective 138.6 kbit/s)...
 Hash of data verified.
 |
 Leaving...
 Hard resetting via RTS pin...
  4. Serial connection 
    ./mpi.bash -s

    Output:

    >> import os
>> print(os.listdir())
 ['boot.py']
>> print('hello world!')
 hello world!
>> print('for quit of screen press CONTROL+A and type :quit')
 for quit of screen press CONTROL+A and type :quit    
>>
  5. Demos
    • List content 
       ./mpi.bash -al

      Ouput:

       /boot.py
    • System information 
       ./mpi.bash -di

      Output:

       run mysources/info.py:
   Platform: esp8266
     Version: 3.4.0
     Modules: {'flashbdev': <module 'flashbdev'>}
       Uname: (sysname='esp8266', nodename='esp8266', release='2.2.0-dev(9422289)', version='v1.9.4-8-ga9a3caad0 on 2018-05-11', machine='ESP module with ESP8266')
 MAC address: 84:f3:eb:xx:xx:xx
 Memory free: 24544 bytes
   Frequency: 80000000 hz
 Count 5K ms: 56210
   Frequency: 160000000 hz
 Count 5K ms: 97798
   Frequency: 80000000 hz
 Count 5K ms: 56042
 DONE.
    • Shift Cipher 
       ./mpi.bash -ds

      Output:

       RUN BOARD:
 ==========
 run mysources/160Mhz.py:
 DONE.
 intento 00: PHHW PH DIWHU WKH WRJD SDUWB
 ...
 intento 24: NFFU NF BGUFS UIF UPHB QBSUZ
 |
 real	0m3.512s
 user	0m0.130s
 sys	0m0.057s
 run mysources/080Mhz.py:
 DONE.
 intento 00: PHHW PH DIWHU WKH WRJD SDUWB
 ...
 intento 24: NFFU NF BGUFS UIF UPHB QBSUZ
 |
 real	0m3.915s
 user	0m0.132s
 sys	0m0.061s
 |
 RUN LOCAL:
 ----------
 intento 00: PHHW PH DIWHU WKH WRJD SDUWB
 ...
 intento 24: NFFU NF BGUFS UIF UPHB QBSUZ
 |
 real	0m0.129s
 user	0m0.021s
 sys	0m0.041s
  6. Display on Arduino of System Information Bar with Micropython
    • Configuration of Wifi
      • SSID 
         ./mpi.bash -dm

        Output:

         Please configure the 'main_ssid' in 'cfg.bash'

        NOTE: Chane the value of main_ssid in the file cfg.bash

      • Password 
         ./mpi.bash -dm

        Output:

         Please configure the 'main_pass' in 'cfg.bash'

        NOTE: Change the value of main_pass in the file cfg.bash

    • Upload the program 
       ./mpi.bash -dm

      Output:

       put esp8266_i2c_lcd.py...uploading:
 put resources/esp8266_i2c_lcd.py...DONE.
 put lcd_api.py...uploading:
 put resources/lcd_api.py...DONE.
 put mysources/wifi.py...DONE.
 put mysources/main.py...DONE.
 run mysources/reset.py...DONE.

Update of text file

See Update of text file in previous article of Visualization in Arduino of the System Information Bar

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