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ESP32-CAM GPIO LED 控制 - uPython
ESP32-CAM 内建有两个发光二极管(light-emitting diode, 以下简称 LED)外设，分别是接在通用型之输入输出 (General-purpose input/output, 以下简称 GPIO) 4, 33，一个是闪光灯 LED，一个是红灯 LED，以下透过网页的方式来对这两个外设装置进行控制。 将 gpio.py 与 gpio.html 上传到 ESP32-CAM gpio.py import machine from microdot import Microdot, redirect, send_file app = Microdot() @app.route('/', methods=['GET', 'POST']) def index(request): form_cookie = None message_cookie = None if requesthod == 'POST': form_cookie = '{pin},{pull}'.format(pin=request.form['pin'], pull=request.form['pull']) if 'write' in request.form: pull = None if request.form['pull'] == 'pullup': pull = machine.Pin.PULL_UP elif request.form['pull'] == 'pulldown': pull = machine.Pin.PULL_DOWN pin = machine.Pin(int(request.form['pin']), machine.Pin.IN, pull) message_cookie = 'Input pin {pin} is {state}.'.format( pin=request.form['pin'], state='high' if pin.value() else 'low') else: pin = machine.Pin(int(request.form['pin']), machine.Pin.OUT) value = 0 if 'set-low' in request.form else 1 pin.value(value) message_cookie = 'Output pin {pin} is now {state}.'.format( pin=request.form['pin'], state='high' if value else 'low') response = redirect('/') else: if 'message' not in request.cookies: message_cookie = 'Select a pin and an operation below.' response = send_file('gpio.html') if form_cookie: response.set_cookie('form', form_cookie) if message_cookie: response.set_cookie('message', message_cookie) return response app.run(debug=True)gpio.html Microdot GPIO Example .slider { -webkit-appearance: none; margin: 14px; width: 360px; height: 25px; background: #FFD65C; outline: none; -webkit-transition: .2s; transition: opacity .2s;} .slider::-webkit-slider-thumb {-webkit-appearance: none; appearance: none; width: 35px; height: 35px; background: #003249; cursor: pointer;} .slider::-moz-range-thumb { width: 35px; height: 35px; background: #003249; cursor: pointer; } function getCookie(name) { var value = "; " + document.cookie; var parts = value.split("; " + name + "="); if (parts.length == 2) return parts.pop().split(";").shift(); } function showMessage() { document.getElementById('message').innerHTML = getCookie('message'); } function onLoad() { showMessage(); var form = getCookie('form'); if (form) { form = form.split(',') //document.getElementById('pin').selectedIndex = parseInt(form[0]); document.getElementById(form[1]).checked = true; } } Microdot GPIO ExampleGPIO Pin: 4 33 13 14 15 16 Pull-Up;; Pull-Down;; None
运行结果如下图所示，先启动 ESP32-CAM 的 1. WiFi 连线，接著2. 运行 gpio.py，当 3. 下方的 Shell 出现 Starting … 时，表示 Web 服务器已经启动，打开电脑的浏览器，输入 ESP32-CAM Web 服务器的位址，4. 选择 GPIO Pin: 4，单击 Set high 键，就可以发现闪光灯 LED 会打开。
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图 1. 透过 Web 控制 ESP32-CAM 的 LED【本文地址】