[Digi-Key Follow me Issue 3] Project Summary Post

EP-Proselyte

[Digi-Key Follow me Issue 3] Project Summary Post [Copy link]

 

Part 1 (3-5 minute short video)

https://training.eeworld.com.cn/video/38622

Part II (Task Summary Report)

Task 1: Use MicroPython system (required task)

Be familiar with the basic operations of Seeed Studio XIAO ESP32C3 development board, install esptool, and flash the MicroPython system to the development board to complete the operation of the entry program

1. Install esptool. If you already have esptool on your computer, you can skip this step.

2. Download MicroPython firmware from:

https://micropython.org/download/esp32c3/

Injecting firmware into the device Final result

Be sure to go to the device manager to find out which serial port the device is in advance to avoid wasting time.

Task 2: Driving the OLED screen on the expansion board

Mission objective: Use OLED screen to display text, graphics, pictures and other information

Because the driver chip of the OLED screen is SSD1306, you can find the micropython library of ssd1306 on the Internet.

Display text and graphics at the same time. The following is the code

from machine import Pin, SoftI2C
from ssd1306 import SSD1306_I2C
from font import Font

i2c = SoftI2C(scl=Pin(7), sda=Pin(6)) 
screen = SSD1306_I2C(128, 64, i2c)
f=Font(screen)

screen.fill_rect(0, 0, 128, 64, 1)
screen.fill_rect(2, 2, 124, 60, 0)
f.text("hello,world!",15,25,16)
screen.show()

operation result

Task 3: Control the buzzer to play music

Task objective: Learn to use the buzzer and be able to make the buzzer play the corresponding music according to the music score

A buzzer is integrated on the expansion board. Since we need to use the buzzer to emit sounds of different frequencies, the pwm function is used here to adjust the frequency.

Write the code according to the frequency to query the pitch. The code is as follows

import machine
import utime

# 定义音调频率
tones = {'1': 277, '2': 294, '3': 330, '4': 349, '5': 392, '6': 440, '7': 494,'8':523,'9':587, '-': 0}
# 定义Bad apple！！！旋律
melody = "23456-986-2-654323456-543234321323456-986-2-654323456-543-4-5-6"

pizzo = machine.Pin(5)
pwm1 = machine.PWM(pizzo)
#frep1 = 500
#pwm1.freq(frep1)
#pwm1.duty_u16(32768)


for tone in melody:
    freq = tones[tone]
    if freq:
        pwm1.init(duty=1000, freq=freq)  # 调整PWM的频率，使其发出指定的音调
    else:
        pwm1.duty(0)  # 空拍时一样不上电
    # 停顿一下 （四四拍每秒两个音，每个音节中间稍微停顿一下）
    utime.sleep_ms(400)
    pwm1.duty(0)  # 设备占空比为0，即不上电
    utime.sleep_ms(100)

Please watch the video for demonstration. No more videos will be played here.

Task 4: Connect to WiFi network

Connect Seeed Studio XIAO ESP32C3 to a WiFi network and access Internet information

One of the great advantages of esp32 is that it is connected to the Internet. Next we only need to

It is really useful to use the network library for networking

Call the interface network.WLAN (network.STA_IF) to set the network mode

Call the interface station.scan() to scan for wifi hotspots

Call the interface station.connect(wifi_ssid, wifi_password) to connect to the wifi network

You can happily call the content on the Internet

Here, the weather is displayed on the development board by obtaining Meizu weather data.

code show as below

import network
import urequests as requests
import ujson as json
import utime as time

# 无线连接设置
wifi_ssid = "MERCURY_8A1B"
wifi_password = "060324a0"

def scan_and_connect():
    station = network.WLAN(network.STA_IF)
    station.active(True)
    
    if not station.isconnected():
        print("Scanning for WiFi networks, please wait...")
        for ssid, bssid, channel, RSSI, authmode, hidden in station.scan():
            print("* {:s}".format(ssid))
            print("   - Channel: {}".format(channel))
            print("   - RSSI: {}".format(RSSI))
            print("   - BSSID: {:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}".format(*bssid))
            print()

        while not station.isconnected():
            print("Connecting...")
            station.connect(wifi_ssid, wifi_password)
            time.sleep(10)

    print("Connected!")
    
    print("My IP Address:", station.ifconfig()[0])
# 联网
scan_and_connect()
import ujson as json
import utime as time
import urequests
import network
from machine import Pin, SoftI2C
import ssd1306
# i2c引脚
i2c = SoftI2C(scl=Pin(7), sda=Pin(6))
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
# 获取天津天气信息
response = urequests.get("https://aider.meizu.com/app/weather/listWeather?cityIds=101030100")
res = json.loads(response.text)
temp = res.get("value", [{}])[0].get("realtime", {}).get("temp")
sd = res.get("value", [{}])[0].get("realtime", {}).get("sD")
# 清除屏幕
oled.fill(0)
# 显示内容
oled.text("TianJin", 10, 15)
oled.text(temp+"C "+sd+"%", 10, 25)
oled.show()

Task 5: Using External Sensors

Connect ambient light sensor or temperature and humidity sensor to obtain sensor value and convert it into real physical quantity

This time, follow me selected two external sensor modules for us, namely the temperature and humidity sensor module AHT20 and the ambient light sensor module.

Here is an example of the temperature and humidity sensor module

Through the information query, we know that this is a digital sensor, which transmits data through the I2C protocol. The chip used is AHT20, which can communicate directly through the I2C protocol according to the instructions in the specification. Due to its wide use, there is already a library written on a certain hub, so here we can directly call ahtx0.py.

code show as below

import ahtx0
from machine import Pin, SoftI2C
from ssd1306 import SSD1306_I2C
from font import Font

i2c = SoftI2C(scl=Pin(7), sda=Pin(6)) 
screen = SSD1306_I2C(128, 64, i2c)
sensor = ahtx0.AHT10(i2c)
f=Font(screen)
values = (sensor.temperature, sensor.relative_humidity)

f.text("T:%.2f"%(values[0]),36,25,16)
f.text("H:%.2f"%(values[1]),36,40,16)
screen.show()
sleep(2)

Part 3: Compilable and downloadable code

The link is here https://download.eeworld.com.cn/detail/EP-Proselyte/630289

Summary

First of all, I would like to thank Dejie and EEWorld for giving me, a student, the opportunity to get in touch with the development board and learn Python programming.

Through this opportunity, I learned about the vast world of development boards, which inspired me to learn more about development boards.