【得捷电子Follow me第3期】使用MicroPython完成任务

ctrlshift12138 · 发表于2023-12-18 00:02

【得捷电子Follow me第3期】使用MicroPython完成任务 [复制链接]

## 第一部分 短视频

https://training.eeworld.com.cn/video/38755

## 第二部分 总结报告

### 任务1：使用MicroPython系统

#### 展示

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#### 硬件

Seeed Studio XIAO ESP32C3

#### 软件

* [Esptool](https://github.com/espressif/esptool/releases/download/v4.6.2/esptool-v4.6.2-win64.zip)(点击链接下载)
* [micorpython固件](https://micropython.org/resources/firmware/ESP32_GENERIC_C3-20231005-v1.21.0.bin)(点击链接下载)
* [Thonny](https://github.com/thonny/thonny/releases/download/v4.1.4/thonny-py38-4.1.4-windows-portable.zip)(点击链接下载)

#### 操作

1. Esptool配置为环境变量

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2. 使用Esptool下载固件
 打开下载好的micropython固件目录，在地址栏中输入cmd，打开命令行窗口，输入命令：

```bash
 esptool --chip esp32c3 --port COM13 --baud 921600 --before default_reset --after hard_reset --no-stub write_flash --flash_mode dio --flash_freq 80m 0x0 ESP32_GENERIC_C3-20231005-V1.21.0.bin
 ```
 其中 `--port`是 ESP32C3 的在设备管理器中的串口号，根据自己的情况修改。

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等待下载完成。

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3. 与micropython的 REPL交互
 打开 Thonny，选择`运行` -> `配置解释器`，解释器选择`MicroPython(ESP32)`,选择正确的端口，点击确定。

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### 任务2：驱动扩展板上的OLED屏幕

#### 展示

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#### 硬件

* Seeed Studio XIAO ESP32C3
* Expansion Board Base for XIAO

#### 软件

* Thonny
* [ampy](https://learn.adafruit.com/micropython-basics-load-files-and-run-code/install-ampy)（Adafruit MicroPython Tool）
（安装需要 Python 环境）
命令行输入：

```bash
pip install adafruit-ampy
```
等待安装完成即可。

#### 代码

```python
"""
任务2：驱动扩展板上的OLED屏幕
使用扩展板上的OLED屏幕显示文字和图形

显示图形参考代码 https://docs.micropython.org/en/v1.21.0/esp8266/tutorial/ssd1306.html
"""

import time
from machine import Pin, SoftI2C
import ssd1306        # 第三方库
import math

def show_text():
  """
  显示文本
  """
  oled.fill(0)
  oled.text("DigiKey", 0, 7)
  oled.text("X", 60, 7)
  oled.text("EEworld", 72, 7)
  oled.text("Follow me", 24, 21)
  oled.text("Episode 3", 24, 35)
  oled.text("XIAO ESP32C3", 12, 49)
  oled.show()

def show_picture():
  """
  显示图片
  """
  oled.fill(0)
  oled.fill_rect(0, 0, 32, 32, 1)
  oled.fill_rect(2, 2, 28, 28, 0)
  oled.vline(9, 8, 22, 1)
  oled.vline(16, 2, 22, 1)
  oled.vline(23, 8, 22, 1)
  oled.fill_rect(26, 24, 2, 4, 1)
  oled.text('MicroPython', 40, 0, 1)
  oled.text('SSD1306', 40, 12, 1)
  oled.text('OLED 128x64', 40, 24, 1)
  oled.show()

i2c = SoftI2C(scl=Pin(7), sda=Pin(6)) # ESP32C3 引脚分配
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
button = Pin(3, Pin.IN, Pin.PULL_UP)  # 配置 3 脚为输入（扩展板上的按键），默认上拉
index = 0           # 页面编号
flash_flag = True       # 刷新标志位

while True:
  if (button.value() == False):   # 当按键被按下，9 脚被拉低
  print("button pressed")
  index = (index + 1)%2   # 页面编号更新
  flash_flag = True     # 刷新标志位置位
  if (flash_flag == True):    # 判断是否需要刷新
  if (index == 0):
    show_text()
  else:
    show_picture()
  flash_flag = False    # 刷新标志位清0
  time.sleep_ms(100)      # 简单按键防抖

```

```python
import ssd1306        # 第三方库
```

[ssd1306](https://github.com/micropython/micropython-lib/blob/master/micropython/drivers/display/ssd1306/ssd1306.py)（点击链接打开） 是驱动 I2C 的库函数。

****

```python
oled.text("DigiKey", 0, 7)
```

表示在OLED屏幕上的`(0,7)`坐标位置显示`DigiKey`。OLED 屏幕的每个字符是 8 * 8 大小。

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#### 操作

1. 上传ssd1306库文件
 `ssd1306.py`保存在 `lib`文件夹下

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在`lib`所在目录打开命令行，输入

```bash
 ampy -p COM13 lib
 ```

表示将`lib`目录及其目录下的文件和文件夹上传到 ESP32C3 中。

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2. 编辑 `boot.py` 文件

### 任务3：控制蜂鸣器播放音乐

#### 展示

（可以看上面视频）

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#### 硬件

* Seeed Studio XIAO ESP32C3
* Expansion Board Base for XIAO

#### 软件

* Esptool
* Thonny
* ampy

#### 代码

```python

"""
任务3：控制蜂鸣器播放音乐
播放音乐参考代码 https://wiki.seeedstudio.com/cn/XIAO_ESP32C3_MicroPython/
显示图片参考代码 https://blog.martinfitzpatrick.com/displaying-images-oled-displays/
Bad Apple 简谱 http://www.sooopu.com/html/399/399104.html
"""

import time
from machine import SoftI2C, Pin, PWM
import ssd1306
import framebuf

i2c = SoftI2C(scl=Pin(7), sda=Pin(6))
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

button = Pin(3, Pin.IN, Pin.PULL_UP)  # 配置 3 脚为输入（扩展板上的按键），默认上拉

# 蜂鸣器初始化
buzzer_Pin = Pin(5, Pin.OUT)
buzzer = PWM(buzzer_Pin)
buzzer.duty(0)

def load_image():
  """
  读取图片
  """
  with open('pic/BadApple.pbm', 'rb') as f:
  f.readline()  # Magic number
  f.readline()  # Creator comment
  f.readline()  # Dimensions
  data = bytearray(f.read())
  return framebuf.FrameBuffer(data, 128, 64, framebuf.MONO_HLSB)

# 定义每个音符的频率
C4 = 262
D4 = 294
E4 = 330
F4 = 349
G4 = 392
A4 = 440
B4 = 494
C5 = 523
C5_= 554
D5 = 587
E5 = 659
F5 = 698
G5 = 784
A5 = 880
B5 = 988
C6 = 1047
D6 = 1175
E6 = 1319
F6 = 1397

# 乐谱
notes = [
  D5, D5, D5, D5, D5, D5, D5,
  D5, D5, D5, D5, D5,
  D5, D5, D5, D5, D5, D5, D5,
  D5, D5, D5, D5, D5,

D4, 0 , D4, C4, D4, D4, 0 , D4, C4, D4,
  D4, 0 , D4, C4, D4, D4, D4, F4, G4, F4, G4,
  D4, 0 , D4, C4, D4, D4, 0 , D4, C4, D4,
  D4, 0 , D4, C4, D4, G4, F4, G4, F4, D4, F4,

D5, E5, F5, G5, A5, D6, C6,
  A5, D5, A5, G5, F5, E5,
  D5, E5, F5, G5, A5, G5, F5,
  E5, D5, E5, F5, E5, D5, C5_,E5,

D5, E5, F5, G5, A5, D6, C6,
  A5, D5, A5, G5, F5, E5,
  D5, E5, F5, G5, A5, G5, F5,
  E5, F5, G5, A5,

C6, D6, A5, G5, A5, G5, A5,
  C6, D6, A5, G5, A5, G5, A5,
  G5, F5, E5, C5, D5, C5, D5,
  E5, F5, G5, A5, D5, A5, C6,
  C6, D6, A5, G5, A5, G5, A5,
  C6, D6, A5, G5, A5, G5, A5,
  G5, F5, E5, C5, D5, C5, D5,
  E5, F5, G5, A5, D5, A5, C6,
  C6, D6, A5, G5, A5, G5, A5,
  C6, D6, A5, G5, A5, G5, A5,
  G5, F5, E5, C5, D5, C5, D5,
  E5, F5, G5, A5, D5, A5, C6,
  C6, D6, A5, G5, A5, G5, A5,
  C6, D6, A5, G5, A5, D6, E6,
  F6, E6, D6, C6, A5, G5, A5,
  #G5, F5, E5, C5, D5, A5, C6        # 版本1
  G5, F5, E5, C5, D5                # 版本2
]

# 歌曲每个音符的持续时间（以毫秒为单位）
# 当 SongSpeed = 1.0 时，四分音符为 200ms
durations = [
  400, 400, 400, 100, 100, 100, 100,
  400, 400, 400, 200, 200,
  400, 400, 400, 100, 100, 100, 100,
  400, 400, 400, 200, 200,

400, 100, 100, 100, 100, 400, 100, 100, 100, 100,
  400, 100, 100, 100, 100, 200, 100, 100, 200, 100, 100,
  400, 100, 100, 100, 100, 400, 100, 100, 100, 100,
  400, 100, 100, 100, 100, 200, 100, 100, 200, 100, 100,

200, 200, 200, 200, 400, 200, 200,
  400, 400, 200, 200, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 200, 200, 200, 200,

200, 200, 200, 200, 400, 200, 200,
  400, 400, 200, 200, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  400, 400, 400, 400,

200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  200, 200, 200, 200, 400, 200, 200,
  #200, 200, 200, 200, 400, 200, 200    # 版本1
  200, 200, 200, 200, 400            # 版本2
]

def play_song():
  """
  播放音乐
  """
  total_notes = len(notes)
  for i in range(total_notes):
  current_note = notes<i>
  wait = durations<i>
  if current_note != 0:
    buzzer.duty(512)    # Set duty cycle for sound
    buzzer.freq(current_note) # Set frequency for sound
  else:
    buzzer.duty(0)    # Turn off the sound
  time.sleep_ms(wait)
  buzzer.duty(0)      # Turn off the sound
  time.sleep_ms(wait/10)

def show_image():
  """
  显示图片
  """
  oled.invert(1)
  oled.blit(load_image(), 0, 0)
  oled.show()

show_image()

while True:
  if button.value() == False:
  play_song() # Play the song
  time.sleep_ms(100)

```

*****

```python
# 蜂鸣器初始化
buzzer_Pin = Pin(5, Pin.OUT)
buzzer = PWM(buzzer_Pin)
buzzer.duty(0)
```

`buzzer_Pin = Pin(5, Pin.OUT)` 表示将Pin5设置为输出模式，`buzzer = PWM(buzzer_Pin)`表示 buzzer_Pin 作为PWM输出，`buzzer.duty(0)` 表示设置PWM的占空比为 0 。

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****

```python
def show_image():
  """
  显示图片
  """
  oled.invert(1)
  oled.blit(load_image(), 0, 0)
  oled.show()
```

`oled.invert(1)`表示颜色反转，`oled.blit(load_image(), 0, 0)`用来显示图片，`load_image()` 是点阵图片数据，`0,0`分别表示绘制图片起始点的x，y坐标。

*****

notes数组是音乐的音符，durations数组是每个音符的持续时间时间。

#### 操作

上传库文件和代码与前面任务相同，不赘述。

### 任务4：连接WiFi网络

#### 展示

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</div>

</ignore_js_op>

#### 硬件

* Seeed Studio XIAO ESP32C3
* Expansion Board Base for XIAO

#### 软件

* Esptool
* Thonny
* ampy

#### 代码

```python
"""
任务4：连接WiFi网络
将Seeed Studio XIAO ESP32C3连接到WiFi网络，并访问互联网信息
参考 https://stackoverflow.com/questions/59296623/micropython-get-correct-current-time
"""

from machine import Pin, SoftI2C, RTC
import ssd1306
from time import sleep
import time
import network
import ntptime

# ESP32 Pin assignment
i2c = SoftI2C(scl=Pin(7), sda=Pin(6))

oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

station = network.WLAN(network.STA_IF)  # 创建 WLAN 网络接口对象，客户端模式
station.active(True)        # 激活网络接口

# 网络配置
wifi_ssid = "1708"        # SSID
wifi_password = "tsl199725?"      # 密码
ntp_server = "ntp.aliyun.com"     # NTP 服务器地址
time_zone = 8           # 时区，东八区

def connect_to_wifi():
  """
  连接到wifi网络
  """
  print("Scanning for WiFi networks, please wait...")
  authmodes = ['Open', 'WEP', 'WPA-PSK' 'WPA2-PSK4', 'WPA/WPA2-PSK']

# 显示扫描到的网络
  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()

# 连接网络
  while not station.isconnected():
  print("Connecting...")
  station.connect(wifi_ssid, wifi_password)
  time.sleep(1)

# 显示连接网络信息
  print("Connected!")
  print("My IP Address:", station.ifconfig()[0])

def sync_ntp():
  """
  NTP 同步时间
  """
  ntptime.host = ntp_server
  retry_times = 10
  try:
  while retry_times > 0:
    retry_times = retry_times - 1
    if ntptime.settime():
      break
  except:
  print("Error syncing time")

connect_to_wifi()         # 连接到网络
sync_ntp()            # 同步NTP 服务器时间
rtc = RTC()
last_second = 61          # 上一次屏幕显示的秒数

while True:
  year, month, day, wday ,hour,minute,second,mocrosecond = rtc.datetime()

if second != last_second:       # 秒变化时，才刷新屏幕
  print(rtc.datetime())       # 串口打印
  last_second = second
  oled.fill(0)

oled.text(str(year), 24, 24)    # 年
  oled.text(".", 56, 24)

if month < 10:        # 月
    oled.text("0" + str(month), 64, 24)
  else:
    oled.text(str(month), 64, 24)
  oled.text(".", 80, 24)
  if day < 10:          # 日
    oled.text("0" + str(day), 88, 24)
  else:
    oled.text(str(day), 88, 24)

hour = (hour + time_zone)%24            # 转为东八区时间
  if hour < 10:         # 时
    oled.text("0" + str(hour), 32, 32)
  else:
    oled.text(str(hour), 32, 32)

oled.text(":", 48, 32)

if minute < 10:         # 分
    oled.text("0" + str(minute), 56, 32)
  else:
    oled.text(str(minute), 56, 32)

oled.text(":", 72, 32)

if second < 10:         #秒
    oled.text("0" + str(second), 80, 32)
  else:
    oled.text(str(second), 80, 32)
  oled.show()
  time.sleep_ms(50)

```

*****

`ntptime.host = ntp_server`设置 NTP 服务器地址

`ntptime.settime()`从NTP 服务器获取时间

需要注意，NTP 获取的时间是**UTC +0** 的时间，北京时间是**UCT+8**，所以代码中有`hour = (hour + time_zone)%24`

#### 操作

上传库文件和代码与前面任务相同，不赘述。

### 任务5：使用外部传感器

#### 展示

使用传感器感应环境的温湿度和环境光强度。

<ignore_js_op>

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小米温湿度传感器

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温湿度差别有点大呀 :sweat_smile:

#### 硬件

* Seeed Studio XIAO ESP32C3
* Expansion Board Base for XIAO
* [Grove - AHT20](https://www.digikey.cn/zh/products/detail/seeed-technology-co-ltd/101990644/11681294) (温湿度传感器)
* [Grove - Light Sensor](https://www.digikey.cn/zh/products/detail/seeed-technology-co-ltd/101020132/6558656) (环境光传感器)

Grove-AHT20 使用了一颗来自奥松电子（ASAIR）的数字式温度传感器AHT20，湿度测量范围0\~100%RH，分辨率0.024%RH；温度测量范围-40\~125℃，分辨率0.01℃。使用I2C协议传输数据。

<ignore_js_op>

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Grove-Light Sensor 使用了一颗光敏电阻和来自Ti的运放LM358来构建电路。输出信号为模拟值，光线越亮，数值越大。

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#### 软件

* [Esptool](https://github.com/espressif/esptool/releases/download/v4.6.2/esptool-v4.6.2-win64.zip)(点击链接下载)
* [Thonny](https://github.com/thonny/thonny/releases/download/v4.1.4/thonny-py38-4.1.4-windows-portable.zip)(点击链接下载)

#### 代码

```python
"""
任务5：使用外部传感器
连接环境光传感器或温湿度传感器，获取传感器的数值，并转换成真实的物理量

ssd1306 驱动库: https://github.com/micropython/micropython-lib/blob/master/micropython/drivers/display/ssd1306/ssd1306.py
AHT20 驱动库: https://github.com/joepweijers/DFRobot_AHT20_MicroPython
"""

import sys
import time
from machine import SoftI2C, Pin, ADC
import ssd1306
import DFRobot_AHT20      # AHT20

# SSD1306 屏幕驱动
i2c = SoftI2C(scl=Pin(7), sda=Pin(6)) # oled屏幕连接I2C引脚
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

# 环境光传感器
light_pin = Pin(2)        # 环境光传感器输出脚连接 GPIO2

# AHT20 驱动
light_sensor = DFRobot_AHT20.DFRobot_AHT20(i2c)

def read_AHT20_sensor(sensor):
  """
  读取 AHT20 传感器数据
  """
  try:
  if sensor.begin() != True:
    print("Failed to start AHT20 sensor")
    sys.exit(1)

sensor.start_measurement_ready()
  temperature = sensor.get_temperature_C()
  humidity = sensor.get_humidity_RH()
  print(f"Temperature: {temperature:3.1f} ℃")
  print(f"Humidity: {humidity:3.1f} %RH")
  return temperature, humidity
  except:
  print("Failed to read AHT20 sensor.")

def read_light_sensor(pin: Pin) -> int:
  """
  读取环境光传感器数据
  """
  adc = ADC(Pin(2)).read_u16()  # 创建 ADC 对象,通过ADC传感器输出的电压值转为数值
  print(f"Light: {adc}")
  return adc        # 返回 ADC 值

temperature = 0
humidity = 0
light = 0

oled.text("Temp :", 12, 10)
oled.text("Humid:", 12, 28)
oled.text("Light:", 12, 48)

oled.show()
start_time = time.ticks_us()

while True:
  now_time = time.ticks_us()
  if time.ticks_diff(now_time, start_time) > 200:
  temperature, humidity =read_AHT20_sensor(light_sensor)
  light = read_light_sensor(light_pin)
  light = light / 65535 *100  # 转化为百分比值

# 清空上次显示的值
  oled.fill_rect(60, 10, 91, 55, 0)

# 显示温度
  oled.text(str(temperature)[:4], 60, 10)
  oled.text("C", 92, 10)

# 显示湿度
  oled.text(str(humidity)[:4], 60, 28)
  oled.text("%RH", 92, 28)

# 显示环境光强度，
  if (light != 100):    # 当强度等于 100% 时，显示3个字符
    oled.text(str(light)[:4], 60, 48)
  else:         # 当强度不等于 100% 时，显示4个字符
    oled.text(str(light)[:3], 60, 48)
  oled.text("%", 92, 48)

oled.show()
  start = now_time
  else:
  time.sleep_ms(20)

```

*****

```python
# 环境光传感器
light_pin = Pin(2)        # 环境光传感器输出脚连接 GPIO2
```

环境光传感器的输出脚连接到扩展版的J5上，对应ESP32C3的 `GPIO2`

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*****

```python
# AHT20 驱动
light_sensor = DFRobot_AHT20.DFRobot_AHT20(i2c)
```

AHT20 使用I2C协议传输数据，D4（GPIO6）脚作为SDA，D5（GPIO7）脚作为SCL，与OLED屏幕使用相同的引脚。

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*****

```python
light = read_light_sensor(light_pin)
light = light / 65535 *100  # 转化为百分比值
```
ESP32-C3 中的ADC是12位的，最大值2^12^ - 1，即 65535。光强最强时，传感器输出到ADC的转换值为 65535，`light / 65535 *100`把0 \~ 65535的范围转变为0 \~ 100%范围。

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*****

```python
now_time = time.ticks_us()
if time.ticks_diff(now_time, start_time) > 200:

else:
  time.sleep_ms(20)

```
`time.ticks_us()` 可以理解为获取当前的系统时间（毫秒单位），`time.ticks_diff(now_time, start_time)`用来计算 now_time 和 start_time 直接是时间差。
这段代码表示每隔200ms读取并显示温湿度和环境光数据。

#### 操作
上传库文件和代码与前面任务相同，不赘述。

### 任务6：寻找WiFi发射源的位置

#### 展示

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#### 硬件

* Seeed Studio XIAO ESP32C3
* Expansion Board Base for XIAO

#### 软件

* Esptool
* Thonny
* ampy

#### 代码

```python
"""
任务6：寻找WiFi发射源的位置
实时测量WiFi信号强度，同时移动开发板位置，找到WiFi发射源（例如路由器）的位置
参考 https://wiki.seeedstudio.com/XIAO_ESP32C3_MicroPython/#final-wi-fi-signal-strength-tracker
"""

import network
import time
from time import sleep
import machine
from machine import Pin, SoftI2C
import ssd1306
import math

# SSD1306 屏幕驱动
i2c = SoftI2C(scl=Pin(7), sda=Pin(6)) # oled屏幕连接I2C引脚
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

# 网络配置
wifi_ssid = "1708"
wifi_password = "tsl199725?"

machine.freq(160000000)     # 设置 CPU频率为 160 MHz
oled.text("Satrting up...", 0, 0)
oled.show()

station = network.WLAN(network.STA_IF)  # 创建 WLAN
station.active(True)        # 激活网络接口
station.connect(wifi_ssid, wifi_password) # 连接到wifi网络
time.sleep(1)

while not station.isconnected():
  time.sleep(1)

oled.fill(0)
oled.text("Connecting to", 0, 0)
oled.text(wifi_ssid, 0, 20)
oled.show()
time.sleep(2)

oled.fill(0)
ip_address = station.ifconfig()[0]# 获取 IP 地址
oled.text("Connected! ", 0, 0)
oled.text("IP Address:", 0, 20)
oled.text(ip_address, 0, 40)
oled.show()
time.sleep(1)

x_pos = [12, 38, 64, 90]    # 对应信号强度方格的x坐标位置
statuses = ["poor", "normal", "good", "excellent"]

def calculate_block_count(rssi):
  """
  根据RSSI值确定块数
  """
  if -80 <= rssi <-60:
  return 1
  elif -60 <= rssi < -40:
  return 2
  elif -40 <= rssi < -20:
  return 3
  elif -20 <= rssi <= 10:
  return 4

def calculate_block_height(index):
  """
  计算信号强度方格高度
  """
  return 10 * (index + 1)

def draw_blocks(count):
  """
  画出信号强度的方格
  """
  for i in range(count):
  y_pos = 50 - calculate_block_height(i)
  oled.fill_rect(x_pos<i>, y_pos, 24, calculate_block_height(i), 1)
  for i in range(count, 4):       # 清空未使用的区域
  y_pos = 50 - calculate_block_height(i)
  oled.fill_rect(x_pos<i>, y_pos, 24, calculate_block_height(i), 0)

while True:
  time.sleep(0.2)
  oled.fill(0)
  rssi = station.status('rssi')     # 获取信号强度
  print("RSSI:" + str(rssi))
  oled.text("RSSI:" + str(rssi) + "dB", 0, 0)
  block_count = calculate_block_count(rssi) # 根据RSSI值确定块数
  status = statuses[block_count - 1]    # 根据块数获取信号强度文本
  oled.text(status, 11, 56)
  draw_blocks(block_count)      # 画出指示信号强度的方格

oled.show()

```

*****

这个任务实现较为简单，主要通过`station.status('rssi')`函数获取连接 WIFI信号的RSSI（Received Signal Strength Indication），信号越强，RSSI越大。

#### 操作

上传库文件和代码与前面任务相同，不赘述。

## 第三部分 源码!
https://download.eeworld.com.cn/detail/ctrlshift12138/630299

【得捷电子Follow me第3期】使用MicroPython完成任务 [复制链接]

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