The new design uses ESP8266 as the main control chip, the display uses a 240*240 LCD, and WS2812 is used as a signal indicator. It is also equipped with a CD42 charging and discharging module, which can be used even when the charging cable is disconnected. The detailed network connection is as shown below:

In order to facilitate development and modification, the software is implemented using MicroPython. The core code is as follows:

main.py

import time
from machine import Timer,Pin

from ST7789V import LCD_240_240
from biliflow import BiliFlow
from RDA58XX import RDA5807
from neopixel import NeoPixel

tim = Timer(-1)

bf = BiliFlow() #b站粉丝数量显示
lcd = LCD_240_240()#显示屏驱动
rda = RDA5807() #收音机启动
np = NeoPixel(Pin(12, Pin.OUT) , 1)   #WS2812驱动 

lcd.Disp_Pic(0x320000) #显示背景图片

def bilibili(t): #定时刷新B站的粉丝数
  r, g, b = np[0]
  np[0] = (50, g, b)
  np.write()
  lcd.Disp_Str(90,140,str(bf.get_follower()).encode('utf-8'))
  np[0] = (0, g, b)
  np.write()

tim.init(period=10000, mode=Timer.PERIODIC, callback=bilibili)

key0 = Pin(0, Pin.IN, Pin.PULL_UP)
key0_statue = key0.value()

key1 = Pin(2, Pin.IN, Pin.PULL_UP)
key1_statue = key1.value()

need_re = 0
while True:
  if not key0_statue == key0.value(): #按下编码器 静音
    key0_statue = key0.value()
    time.sleep_ms(10)
    if key0.value() == 0:
      print("mute")
      rda.mute() 

  if not key1_statue == key1.value(): #右旋编码器，向下搜台
    key1_statue = key1.value()

    if key1.value() == 0:
      print("next")
      rda.next_sta()
      time.sleep_ms(3000)
      need_re = 1

  if need_re == 1: #刷新当前电台的频率
      rda.refresh_info()
      need_re = 0
      lcd.Disp_Str(0,0,b'              ')
      lcd.Disp_Str(0,0,("FM:" + str(rda.tune)).encode('utf-8'))
      print("FM:", rda.tune ,"RSSI:", rda.rssi)

In addition, radio chip driver, LCD display driver and fan number display related codes are also required.

RDA58XX.py radio driver code

from machine import Pin, SoftI2C
import time
import machine

class RDA5807(object):
  def __init__(self):
    self.i2c = SoftI2C(scl=Pin(4), sda=Pin(5), freq=10000)
    self.i2c_buf = bytearray(2)
    self.i2c_buf4 = bytearray(4)
    self.is_mute = 0
    self.rssi = 0
    self.tune = 0

  def next_sta(self): #向下搜台
    self.i2c_buf[0] = 0xd3
    self.i2c_buf[1] = 0x81
    self.i2c.writeto(0x10, self.i2c_buf)

  def pro_sta(self): #向上搜台
    self.i2c_buf[0] = 0xd1
    self.i2c_buf[1] = 0x81
    self.i2c.writeto(0x10, self.i2c_buf)

  def set_ch(self, ch): #设置频率eg. 965  unit 100KHz
    self.i2c_buf4[0] = 0xd0
    self.i2c_buf4[1] = 0x01
    ch -= 870
    self.i2c_buf4[2] = ((ch >> 2) & 0xff)
    self.i2c_buf4[3] = ((ch << 5) & 0xff)
    self.i2c.writeto(0x10, self.i2c_buf4)

  def refresh_info(self):  #获取当前频率，信号强度等
    self.i2c.readfrom_into(0x11, self.i2c_buf4)
    self.tune = 870 + self.i2c_buf4[1]
    self.rssi = self.i2c_buf4[2] >> 1

  def mute(self): #静音/取消静音
    if self.is_mute == 1:
      self.i2c_buf[0] = 0xd0
      self.is_mute = 0
    else:
      self.i2c_buf[0] = 0x90
      self.is_mute = 1

    self.i2c_buf[1] = 0x01
    self.i2c.writeto(0x10, self.i2c_buf)

ST7789V.py Display driver

from machine import Pin, SPI
import time
import machine
import esp

class LCD_240_240(object):
  def __init__(self):    
    self.hspi = SPI(1, 40000000)
    self.lcd_dc = Pin(15, Pin.OUT)

    self.lcd_dc.off()
    self.hspi.write(b'x11')

    time.sleep(0.05)

    self.LCD_Cmd_Data(b'x36',b'x00')
    self.LCD_Cmd_Data(b'x3A',b'x05')
    self.LCD_Cmd_Data(b'xB2',b'x0Cx0Cx00x33x33')
    self.LCD_Cmd_Data(b'xB7',b'x35')
    self.LCD_Cmd_Data(b'xBB',b'x19')
    self.LCD_Cmd_Data(b'xC0',b'x2C')
    self.LCD_Cmd_Data(b'xC2',b'x01')
    self.LCD_Cmd_Data(b'xC3',b'x12')
    self.LCD_Cmd_Data(b'xC4',b'x20')
    self.LCD_Cmd_Data(b'xC6',b'x0F')
    self.LCD_Cmd_Data(b'xD0',b'xA4xA1')
    self.LCD_Cmd_Data(b'xE0',b'xD0x04x0Dx11x13x2Bx3Fx54x4Cx18x0Dx0Bx1Fx23')
    self.LCD_Cmd_Data(b'xE1',b'xD0x04x0Cx11x13x2Cx3Fx44x51x2Fx1Fx1Fx20x23')

    self.lcd_dc.off()
    self.hspi.write(b'x21x29')

  def LCD_Cmd_Data(self,cmd, data):
    self.lcd_dc.off()
    self.hspi.write(cmd)
    self.lcd_dc.on()
    self.hspi.write(data)

  def SetDisArea(self,xStart,yStart,xEnd,yEnd):    
    buf = bytearray(4)
    buf[0] = 0
    buf[1] = xStart
    buf[2] = 0
    buf[3] = xEnd
    self.LCD_Cmd_Data(b'x2A',buf)

    buf[1] = yStart
    buf[3] = yEnd
    self.LCD_Cmd_Data(b'x2B',buf)

    self.lcd_dc.off()
    self.hspi.write(b'x2C')

  def Disp_Color(self,Color): #整屏填充某个颜色
    self.SetDisArea(0,0,239,239)
    self.lcd_dc.on()

    buf = bytearray(480)
    for j in range(240):
      buf[j*2] = Color >> 8
      buf[j*2+1] = Color & 0xFF

    for i in range(240):
      self.hspi.write(buf)

  def DrawPoint(self,x,y,color):#在指定位置打点
    buf = bytearray(2)
    buf[0] = 0
    buf[1] = x
    self.LCD_Cmd_Data(b'x2A',buf)

    buf[1] = y
    self.LCD_Cmd_Data(b'x2B',buf)

    buf[0] = color >> 8
    buf[1] = color &0xFF  
    self.LCD_Cmd_Data(b'x2C',buf)

  def Disp_Pic(self, star_addr): #显示图像，从Flash固定位置读取图像并显示在屏幕上
    self.SetDisArea(0,0,239,239)
    self.lcd_dc.on()
    buf = bytearray(480)
    byte_offset = star_addr

    for i in range(240):
      esp.flash_read(byte_offset, buf)
      self.hspi.write(buf)
      byte_offset += 480

  def Disp_Str(self,x,y,str_datda):#显示字符串，需提前将字库烧录到0x300000位置
    font_buf = bytearray(64)

    for c in str_datda:
      start_addr = 0x300000 + 65*(c - 0x20)
      esp.flash_read(start_addr, font_buf)
      self.SetDisArea(x,y,x+15,y+31)
      x+=16
      self.lcd_dc.on()

      for j in range(64):
        for k in range(8):
          if (font_buf[j] & (0x01<<k)) ==  (0x01 << k):
            self.hspi.write(b'xf8x00')
          else:
            self.hspi.write(b'xffxff')

bilibiliflow.py Get the number of fans of station B

import network
import json  # 导入json功能模块
import urequests #导入urequests功能模块

class BiliFlow(object):
  def __init__(self):
    wifi = network.WLAN(network.STA_IF) # 将模块设为STA模式
    wifi.active(True) # 开启WIFI

    if not wifi.isconnected(): # 如果wifi模块未连接到热点
      print('WiFi 连接中...')
      wifi.connect('your_wifi' , 'xx123456') #连接自己的手机热点

      while not wifi.isconnected():  #等待wifi连接
        pass

    print('WiFi 连接成功' ,  wifi.ifconfig()) #连接成功

  def get_follower(self):#获取粉丝数，将下列vmid修改成自己的即可
    r = urequests.get('http://api.bilibili.com/x/relation/stat?vmid=604244921')
    p = json.loads(r.text)    
    return p['data']['follower']