Digi-Key Electronics Follow me 2nd issue summary [revised]

khalilduboa

Digi-Key Electronics Follow me 2nd issue summary [revised] [Copy link]

 

This event is actually very suitable for novice practice. The project is relatively simple. I chose to take this opportunity to complete the project with CircuitPython. Since it was my first time using CircuitPython for development, I was learning while developing. This project summary report is a teaching article. If you want to try CircuitPython development, you can practice through this event.

1. Introduction to development board and development environment

First, let me introduce the board Adafruit ESP32-S3 TFT Feather. Once you get the board, you just need to download the circuit python firmware. The download method is also very simple. Quickly press the RST button twice to enter UF2 mode, and then put the circuit python firmware into the USB drive you found. During the development process, if you want to debug, you can of course choose online debugging, or choose to combine with other IDEs, but I found that this development board is quite intimate. We can directly see the error report on the built-in LCD screen, and we can barely complete the development.

2. Preparation

With a convenient development board and development environment, the subsequent work is relatively simple. However, there is relatively little information on circuit python, so there are some issues to discuss.

1. Our development board model is Feather ESP32-S3 TFT PSRAM. Don’t make the wrong choice when selecting the firmware. I’ll also post the official website address https://circuitpython.org/board/adafruit_feather_esp32s3_tft/
   
   Remember to choose the .uf2 file to download.
2. After flashing the firmware, our project structure looks scary with a lot of stuff, but it's nothing. The main thing is code.py, which is the core code of our project and is used to run the program.
   The lib folder is used to store our various module files, so that we can give full play to the power of Python.
   Other spaces can be used to store various other resources, such as the background picture I want to use in this project.
3. Calling various libraries

The adafruit_led_animation library can easily control LED dynamic effects

The displayio library is a CircuitPython built-in library used to control screen output

adafruit_bitmap_font library for loading custom fonts

3. Function introduction and implementation

Next is the function introduction. I chose "Subtask 1: Calendar & Clock - Complete a perpetual calendar clock that can be updated via the Internet and display local weather information". The task is relatively simple and can be completed after completing the subtask, which is very suitable for us. "Task 1: Control the screen to display Chinese" is used to display the weather, "Task 2: Use the network function" is used to obtain the regional weather, and "Task 3: Control WS2812B" is used to control the LED.

Task 1: Control the screen to display Chinese

# Import the label from the external library adafruit_display_text to display the label

from adafruit_display_text import label

# Load the font and define the font color

font = bitmap_font.load_font("/font/sytq_16.pcf")

nun_font = bitmap_font.load_font("/font/DingTalk_ncn_60.pcf")

color = 0xf26957

# Initialize date labels and set x, y axis plot coordinates, then add labels to the image group

date = label.Label(font, text="", color=color)

date.x = 50

date.y = 20

group.append(date)

The label.Label method can be used to display content such as:

date = label.Label(font, text="Tuesday, October 17", color=color) can display "Tuesday, October 17" on the screen.

Task 2: Network Function Usage

register

# Import the os library to obtain wifi information

import os

# Import the rtc library to implement the RTC clock

import rtc

# Import wifi and time libraries for backup

import wifi

import time

# Import network library for backup

import ssl

import socketpool

import adafruit_ntp

import adafruit_requests

# Use the os.getenv function to get the wifi ssid and password from the setting.toml file

ssid = os.getenv("CIRCUITPY_WIFI_SSID")

password = os.getenv("CIRCUITPY_WIFI_PASSWORD")

Then comes the most important thing, which is to write the settings.tmol file. Write in the WiFi password and WiFi name, and then you can see the displayed IP address.

Task 3: Control WS2812B (Required Task)

# Import DigitalInOut, Direction, Pull from the digitalio built-in library

from digitalio import DigitalInOut, Direction, Pull

# Import the neopixel built-in library

import neopixel

# import Blink from the adafruit_led_animation.animation.blink library

from adafruit_led_animation.animation.blink import Blink

# Import five color definitions from the adafruit_led_animation.color library

from adafruit_led_animation.color import JADE, BLACK, ORANGE, GOLD, OLD_LACE

# Initialize pixel light pins

pixel_pin = board.NEOPIXEL

# Set the number of pixel lights. This will make it easier to modify the code later, such as connecting an external ws2812 light strip or matrix

num_pixels = 1

# Initialize pixel lights

pixels = neopixel.NeoPixel(

pixel_pin, num_pixels, brightness=0.2, auto_write=False, pixel_order=neopixel.GRB

)

# Initialize blink dynamic effect

blink = Blink(pixels, speed=0.5, color=BLACK)

# Initialize the btn button object

btn = DigitalInOut(board.BOOT0)

# Set the btn pin as input

btn.direction = Direction.INPUT

# Set the btn pin to pull up

btn.pull = Pull.UP

Weather Clock

Since we use Amap's weather API, let's take a look at how to use it. It's actually very simple http

send

return

# Use adafruit_ntp.NTP function to initialize the ntp service. The first function is to determine the network connection port.

# The second function sets the time zone. China is in +8 time zone. The third function is used to specify the ntp server address.

pool = socketpool.SocketPool(wifi.radio)

ntp = adafruit_ntp.NTP(pool, tz_offset=8, server="ntp.aliyun.com")

# Use ntp time to update system time

rtc.RTC().datetime = ntp.datetime

def get_wday(wday):

if (wday == 0):

return "Monday"

elif (wday == 1):

return "Tuesday"

elif (wday == 2):

return "Wednesday"

elif (wday == 3):

return "Thursday"

elif (wday == 4):

return "Friday"

elif (wday == 5):

return "Saturday"

elif (wday == 6):

return "Sunday"

# Initialize the requests object

pool = socketpool.SocketPool(wifi.radio)

requests = adafruit_requests.Session(pool, ssl.create_default_context())

def get_weather():

# Set the city id

city = "340100"

# This function uses the Amap API. To use this API, you need to register a related account and apply for a key first.

key = "0154a9c43e2b7d940f39e72a07c599c8"

# Concatenate weather link url

getweather_url = " https://restapi.amap.com/v3/weather/weatherInfo?city= " + city + "&key=" + key

# Get weather json data

response = requests.get(getweather_url)

json_resp = response.json()

# Close the connection

response.close()

# Parse json data and return temperature and weather information

for da in json_resp["lives"]:

#print(da["temperature"])

return da["temperature"], da["weather"]

# First create a status variable to get weather information when the device starts

status = "boot"

# Define the led_color variable for switching between five colors

led_color = 0

# Get the local RTC time once a second

t = time.localtime()

# When the first startup or the minute attribute of the local RTC time is 0, update the date label and weather label

if (status == "boot" or t.tm_min == 0):

# Update date tag

date.text = "%d month %d day" % (t.tm_mon, t.tm_mday)

week.text = get_wday(t.tm_wday)

# Get weather information

str_t, str_tz = get_weather()

# Update temperature labels

temp.text = "%s°" % (str_t)

# Update weather labels

tempzh.text = str_tz

status = "updated"

# Update the clock label every 1 second for dynamic display

if (t.tm_sec % 2 == 0):

timeL.text = "%02d:%02d" % (t.tm_hour, t.tm_min)

timeL.color = 0xf26957

else:

timeL.text = "%02d:%02d" % (t.tm_hour, t.tm_min)

timeL.color = 0xD9D7C9

# Refresh the screen

display.show(group)

# Sleep for 1 second

time.sleep(1)

Finally, let's take a look at the complete code. It was a bit messy when I first used Python for development, but the final effect was good. I really like circuit python. It is much better than hard-coding C language. Especially the various library functions of Python can be applied, which greatly facilitates our development difficulty. Developers like me who are new to circuit python can also get started quickly. I am very grateful for this opportunity to learn a lot of new knowledge, especially the development board is very attractive. I hope that more events can be held and the better they are.

Here is my project video: https://training.eeworld.com.cn/video/38035

This link is my project code: https://download.eeworld.com.cn/detail/khalilduboa/629655?type__2276=n4mx27D%3D3QqrG8DlxGr8D9DRxGqopjhp0AoD&alichlgref=http%3A%2F%2Fen.eeworld.com/bbs%2Fmy%2Fhome.php%3Fcur%3Dmyhome%26act%3Ddownload

freebsder

Python running on a battery-powered MCU consumes a lot of power