树莓派 pico W（创客版）RP2020 W代码示例温度检测+液晶显示屏+HTTP服务器页面控制灯光

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#  版本：V2.0
#  author: zhulin
# 硬件:
# 1. Pico + Esp8285开发板
# 2. LED灯 2个
# 3. DS18B20温度传感器 1个
# 4. 1602液晶LCD显示屏 1个
# 5. 10K可调电阻 1个，调整液晶屏的对比度
# 说明：
#   1. HTTP服务器，绿色LED，有访问闪烁
#   2. 温度传感器，读取温度时，红灯闪烁
#   3. LCD1602显示，文字
#---------------------------------------
from machine import UART, Pin, PWM
import utime,time
import _thread
import sys
import machine
import onewire, ds18x20

# ----- 蜂鸣器 --------
BuzzerObj=PWM(Pin(6))

# ------------- 引脚定义 ------------
board_led = machine.Pin(25, machine.Pin.OUT) # 板载LED灯

# ************* 18B20 温度传感器 *************
temperature_sensor = machine.Pin(4) # 温度传感器
led_extern_temperature_status = machine.Pin(3, machine.Pin.OUT) # 温度传感器状态灯
ds = ds18x20.DS18X20(onewire.OneWire(temperature_sensor))

# ************* ESP8285 无线WIFI模块 **************
led_extern_httpserver_status = machine.Pin(5, machine.Pin.OUT)
# 串口映射到GP0和GP1端口上，在使用该端口和WIFI模块通讯时，不要使用GP0和GP1端口
esp_uart = UART(0, 115200) # 串口0,波特率为115200

# WIFI 路由器信息，请填上自己的WIFI路由器信息
SSID='XXXXXX'       # WIFI名称
password = 'xxxxxxx'   # WIFI密码
Port = '8080'            # 自定义端口号

# ************* LCD1602液晶显示屏 *****************
#---------------引脚-------------
# 数据或命令 读写   
rs = machine.Pin(16,machine.Pin.OUT)
e = machine.Pin(17,machine.Pin.OUT)

d4 = machine.Pin(18,machine.Pin.OUT)
d5 = machine.Pin(19,machine.Pin.OUT)
d6 = machine.Pin(20,machine.Pin.OUT)
d7 = machine.Pin(21,machine.Pin.OUT)

global bIsInit # 已经初始化
bIsInit = False

def buzzer(buzzerPinObject,frequency,sound_duration,silence_duration):
    # Set duty cycle to a positive value to emit sound from buzzer
    buzzerPinObject.duty_u16(int(65536*0.2))
    # Set frequency
    buzzerPinObject.freq(frequency)
    # wait for sound duration
    time.sleep(sound_duration)
    # Set duty cycle to zero to stop sound
    buzzerPinObject.duty_u16(int(65536*0))
    # Wait for sound interrumption, if needed 
    time.sleep(silence_duration)

# Play following notes by changing frequency:
def Note_1():
    #C (DO)
    buzzer(BuzzerObj,523,0.5,0.1)

def Note_1_3():
    #C (DO)
    buzzer(BuzzerObj,523,1.5,0.1)
    
def Note_2():
    #D (RE)
    buzzer(BuzzerObj,587,0.5,0.1)

def Note_3():
    #E (MI)
    buzzer(BuzzerObj,659,0.5,0.1)

def Note_4():
    #F (FA)
    buzzer(BuzzerObj,698,0.5,0.1)

def Note_5():
    #G (SOL)
    buzzer(BuzzerObj,784,0.5,0.1)

def Note_6():
    #A (LA)
    buzzer(BuzzerObj,880,0.5,0.1)

def Note_7():
    #B (SI)
    buzzer(BuzzerObj,987,0.5,0.1)

def marryAndSheep():
    Note_3()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    Note_1()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    
    Note_3()
    time.sleep_ms(50)
    Note_3()
    time.sleep_ms(50)
    Note_3()
    time.sleep_ms(50)
    time.sleep_ms(50)
    
    Note_2()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    time.sleep_ms(50)
    
    Note_3()
    time.sleep_ms(50)
    Note_5()
    time.sleep_ms(50)
    Note_5()
    time.sleep_ms(50)
    time.sleep_ms(50)
    
    Note_2()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    Note_3()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    
    Note_3()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    Note_1()
    time.sleep_ms(50)
    Note_2()
    time.sleep_ms(50)
    
    Note_3()
    time.sleep_ms(50)
    Note_3()
    time.sleep_ms(50)
    Note_3()
    time.sleep_ms(50)
    time.sleep_ms(50)
    
    Note_1_3()
    
    # 休眠，防止烧坏
    BuzzerObj.deinit()
    
# 闪烁并点亮板载LED灯
def board_led_toggle():
    board_led.toggle()
    time.sleep(2)
    board_led.value(1)
  
def LCD1602_pulseE():
    e.value(1)
    utime.sleep_us(40)
    e.value(0)
    utime.sleep_us(40)

# 发送给LCD
def LCD1602_send2LCD4(BinNum):
    d4.value((BinNum & 0b00000001) >>0)
    d5.value((BinNum & 0b00000010) >>1)
    d6.value((BinNum & 0b00000100) >>2)
    d7.value((BinNum & 0b00001000) >>3)
    LCD1602_pulseE()
    
def LCD1602_send2LCD8(BinNum):
    d4.value((BinNum & 0b00010000) >>4)
    d5.value((BinNum & 0b00100000) >>5)
    d6.value((BinNum & 0b01000000) >>6)
    d7.value((BinNum & 0b10000000) >>7)
    LCD1602_pulseE()
    d4.value((BinNum & 0b00000001) >>0)
    d5.value((BinNum & 0b00000010) >>1)
    d6.value((BinNum & 0b00000100) >>2)
    d7.value((BinNum & 0b00001000) >>3)
    LCD1602_pulseE()
    
def LCD1602_setUpLCD():
    rs.value(0)
    LCD1602_send2LCD4(0b0011)#8 bit
    LCD1602_send2LCD4(0b0011)#8 bit
    LCD1602_send2LCD4(0b0011)#8 bit
    LCD1602_send2LCD4(0b0010)#4 bit
    LCD1602_send2LCD8(0b00101000)#4 bit,2 lines?,5*8 bots
    LCD1602_send2LCD8(0b00001100)#lcd on, blink off, cursor off.
    LCD1602_send2LCD8(0b00000110)#increment cursor, no display shift
    LCD1602_send2LCD8(0b00000001)#clear screen
    utime.sleep_ms(2)#clear screen needs a long delay

def LCD1602_ShowText(text):
    LCD1602_setUpLCD()
    # 选择数据寄存器
    rs.value(1)
    # strText = 'Temp: 23.5`C'
    strText = text
    for x in strText:
        intVal = ord(x) # 字符转化为数字，比如'A' -> 
        LCD1602_send2LCD8(intVal)
        # print(intVal)

# 全局变量
global g_cur_tempture
g_cur_tempture = "999.01"

# 发送命令函数
def esp_sendCMD(cmd,ack,timeout=2000):
    esp_uart.write(cmd+'\r\n')
    i_t = utime.ticks_ms()
    while (utime.ticks_ms() - i_t) < timeout:
        s_get=esp_uart.read()
        if(s_get != None):
            s_get=s_get.decode()
            print(s_get)
            if(s_get.find(ack) >= 0):
                return True
    return False

# 发送数据
def esp_sendData(ID,data):
    esp_sendCMD('AT+CIPSEND='+str(ID)+','+str(len(data)),'>')
    esp_uart.write(data)

# 接收数据
def esp_ReceiveData():
    s_get=esp_uart.read()
    if(s_get != None):
        print(s_get)
        s_get=s_get.decode()
        if(s_get.find('+IPD') >= 0):
            n1=s_get.find('+IPD,')
            n2=s_get.find(',',n1+5)
            ID=int(s_get[n1+5:n2])
            n3=s_get.find(':')
            s_get=s_get[n3+1:]
            return ID,s_get
    return None,None

def esp_StartTcpServer():
    esp_uart.write('+++')            # 初始化退出透传模式
    time.sleep(1)
    if(esp_uart.any()>0):
        esp_uart.read()
    esp_sendCMD("AT","OK")           # AT指令
    esp_sendCMD("AT+CWMODE=3","OK")  # 配置 WiFi 模式
    esp_sendCMD("AT+CWJAP=\""+SSID+"\",\""+password+"\"","OK",20000) # 连接路由器
    esp_sendCMD("AT+CIPMUX=1","OK")            # 使能多连接 
    esp_sendCMD("AT+CIPSERVER=1,"+Port,"OK")   # 建⽴ TCP server
    esp_sendCMD("AT+CIFSR","OK")               # 查询 WIFI模块的 IP 地址
    print('-- ESP8285 Webserver --port: %s' % Port)
    
def http_SetText(pkgid, body):
    head = 'HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\n\r\n'
    rawhtml = "{}{}\r\n".format(head, body)
    esp_sendData(pkgid,rawhtml)
    time.sleep_ms(50)
    esp_sendCMD("AT+CIPCLOSE=0","OK")
    led_extern_httpserver_status.value(1)
    time.sleep_ms(200)
    led_extern_httpserver_status.value(0)

def print_time(thread_name, delay):
    while True:
        time.sleep(delay)
        print("%s: %s" % (thread_name, time.gmtime()))

def thread_getTemperture(thread_name, delay):
    while True:
        # scan for devices on the bus
        roms = ds.scan()
        print('found devices:', roms)
        lenRoms = len(roms)
        if lenRoms == 0:
            print('没找到DS18B20温度传感器')
            text = 'Temp: 18B20 Err'
            LCD1602_ShowText(text)
            time.sleep(1)
        else:
            
            
            try:
                # loop 10 times and print all temperatures
                for i in range(10 * 10):
                    ds.convert_temp()
                    time.sleep_ms(750)
                    for rom in roms:
                        tupTime = time.gmtime()
                        strCurTime = "{}-{}-{} {}:{}:{}".format(tupTime[0], tupTime[1], tupTime[2], tupTime[3], tupTime[4],tupTime[5])
                
                        print(strCurTime , '| temperatures:', end=' ')
                        global g_cur_tempture
                        g_cur_tempture = ds.read_temp(rom)
                        #g['tempture'] = g_cur_tempture
                        print(g_cur_tempture, end=' ')
                        print()
                    led_extern_temperature_status.toggle()    
                    #print(g_cur_tempture)
                    text = 'Temp: %s`C' % g_cur_tempture
                    LCD1602_ShowText(text)
                    global bIsInit
                    if bIsInit == False:
                        bIsInit = True
                        print('---> play song')
                        marryAndSheep()
                    time.sleep_ms(5250)
            except:
                text = 'Except ERR'
                LCD1602_ShowText(text)
                
                # time.sleep(1)
                
        time.sleep(delay)

def led_on():
   # led_extern_temperature_status.value(1)
   # time.sleep_ms(200)
    board_led.value(1)
    time.sleep_ms(100)
    print('func[led_on]')

    
def led_off():
    #led_extern_temperature_status.value(0)
    #time.sleep_ms(200)
    board_led.value(0)
    time.sleep_ms(100)
    print('func[led_off]')


# 程序入口
if __name__ == "__main__":
    board_led_toggle()
    text = 'Loading...'
    LCD1602_ShowText(text)
    esp_StartTcpServer()
    text = 'PicoSite Hi!'
    LCD1602_ShowText(text)
    
    #_thread.start_new_thread(print_time, ("Thread 1", 1, ))
    _thread.start_new_thread(thread_getTemperture, ("thread_ds18b20", 30))
    while True:
        ID,s_get=esp_ReceiveData()            # 接收数据
        if(ID != None):
            if s_get.find("/led?led=on") != -1:
                print('----> led on')
                led_on()
                html = '''<!DOCTYPE HTML><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>MyPicoSite</title></head><body>led=on</body></html>'''
                http_SetText(ID, html)
                #board_led.value(1)
                #time.sleep_ms(100)
                continue
            elif s_get.find("/led?led=off") != -1:
                print('----> led off')
                led_off()
                #board_led.value(0)
                #time.sleep_ms(100)
                html = '''<!DOCTYPE HTML><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>MyPicoSite</title></head><body>led=off</body></html>'''
                http_SetText(ID, html)
                continue
            else:
                print('--recv: {}bytes', len(s_get))
                
            # 设备时间
            tupTime = time.gmtime()
            strCurTime = "{}-{}-{} {}:{}:{}".format(tupTime[0], tupTime[1], tupTime[2], tupTime[3], tupTime[4],tupTime[5])
            
            # 硬件信息
            deviceInfo = sys.implementation
            print("当前温度: {}".format(g_cur_tempture))
            
            strBody = '''device: {}<br>
time: {}<br>
tempture: {}<br>'''.format(deviceInfo,strCurTime, g_cur_tempture)
            
            html = """
<!DOCTYPE html>  
<html>  
<head>  
  <title>PicoStie-JG</title>  
  <meta name="viewport" content="width=device-width, initial-scale=1">  
  <style>  
    body {
      background-color: #f2f2f2; 
      font-family: Arial, sans-serif;  
      text-align: center;  
      max-width: 100%;  
      margin: 0 auto;  
    }
    button {
      background-color: #4CAF50;
      color: white;
      padding: 15px 32px; 
      text-align: center; 
      text-decoration: none;
      display: inline-block;
      font-size: 16px;
      margin: 4px 2px;
      cursor: pointer;
    }
    button.green {
      background-color: #4CAF50;
      color: #FFFFFF;
    }
    button.red {  
      background-color: #FF5733;
      color: #FFFFFF; 
    }
    button.refresh {  
      background-color: #56452d;
      color: #FFFFFF; 
    }
  </style>  
</head>  
<body>  
  <h1>This My Pico Site!</h1>
   <hr>
  <button class="green" onclick="fetch('/led?led=on');">led=on</button><br>
  <button class="red" onclick="fetch('/led?led=off');">led=off</button><br>
  <button class="refresh" onclick="location.reload()">refresh</button>
  <br>
  <hr>"""
            strTail = '</body></html>'
            html = html + strBody + strTail
            http_SetText(ID, html)