ESP32探索记录
1 ESP32-CAM板
1.1 开局
淘宝30块买了各esp32-cam板子;
VSCode配置micropython开发环境(安装RT-Threat Micropyton插件);
micropython官方下载esp32 espressif固件;
通过esptool刷入固件,命令如下:
esptool --chip esp32 --port COM8 erase_flash
esptool --chip esp32 --port COM8 write_flash -z 0x1000 E:\Projects\esp32\ESP32_GENERIC-20240602-v1.23.0.bin
发现无法进入repl,怀疑板子坏了;
用商家教程配置Arduino环境,烧录验证板子可用;
用Thonny尝试连接,提示板子处于忙碌状态或bootloader模式;
查资料发现GPIO0控制烧录和调试模式;
观察底板电路,发现CH240芯片,观察板子走线发现GPIO0连接芯片DTR引脚;
查找芯片手册发现"DTR and Multi-Mode MCUs Download"部分涉及这个问题;
底板芯片配置为DTR输出低电平,导致通过底板连接esp32只能烧录不能调试;
于是单独购买烧录器,通过杜邦线连接3.3v输出;
尝试连接板子成功,打印信息成功;
尝试esp32连接无线网失败,电压不够板子总重启;
更换烧录器5v输出,连接网络成功;
测试camera,发现没有camera库;
尝试用uip导入camera库,报错不存在uip;
尝试用mip导入camera库,报错找不到camera库;
找了两个开源项目 https://github.com/shariltumin/esp32-cam-micropython 和 https://github.com/shariltumin/esp32-cam-micropython-2022 下载包含camera驱动的固件:
https://files.cnblogs.com/files/blogs/683126/esp32固件.zip?t=1721614583&download=true
烧录新固件,测试导入camera库成功;
1.2 点灯
学习教程 http://micropython.com.cn/en/latet/esp32/quickref.html ;
通过machine库的Pin方法引脚4输出高电平点亮闪光灯;
通过time库sleep_ms方法,使闪光灯间隔300ms闪烁;
1.3 连接wifi
1.4 网页控制电灯
try:
import usocket as socket
except:
import socket
from machine import Pin
import network
import esp
esp.osdebug(None)
import gc
gc.collect()
ssid = 'CIEM'
password = 'Ciem888888'
station = network.WLAN(network.STA_IF)
station.active(True)
station.connect(ssid, password)
while station.isconnected() == False:
pass
print('Connection successful')
print(station.ifconfig())
led = Pin(4, Pin.OUT)
def web_page():
if led.value() == 1:
gpio_state="ON"
else:
gpio_state="OFF"
html = """
<html>
<head>
<title>ESP Web Server</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:,">
<style>
html {
font-family: Helvetica;
display:inline-block;
margin: 0px auto;
text-align: center;
}
h1 {
color: #0F3376;
padding: 2vh;
}
p {
font-size: 1.5rem;
}
.button {
display: inline-block;
background-color: #e7bd3b;
border: none;
border-radius: 4px;
color: white;
padding: 16px 40px;
text-decoration: none;
font-size: 30px;
margin: 2px;
cursor: pointer;
}
.button2 {
background-color: #4286f4;
}
</style>
</head>
<body>
<h1>ESP Web Server</h1>
<p>GPIO state:
<strong>""" + gpio_state + """</strong>
</p>
<p>
<a href="/?led=on">
<button class="button">ON</button>
</a>
</p>
<p>
<a href="/?led=off">
<button class="button button2">OFF</button>
</a>
</p>
</body>
</html>
"""
return html
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 80))
s.listen(5)
while True:
conn, addr = s.accept()
print('Got a connection from %s' % str(addr))
request = conn.recv(1024)
request = str(request)
print('Content = %s' % request)
led_on = request.find('/?led=on')
led_off = request.find('/?led=off')
if led_on == 6:
print('LED ON')
led.value(1)
if led_off == 6:
print('LED OFF')
led.value(0)
response = web_page()
conn.send('HTTP/1.1 200 OK\n')
conn.send('Content-Type: text/html\n')
conn.send('Connection: close\n\n')
conn.sendall(response)
conn.close()
本文来自博客园,作者:工大鸣猪,转载请注明原文链接:https://www.cnblogs.com/hit-ztx/p/18315419